scripts/checkpatch.pl

   1 #!/usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # (c) 2001, Dave Jones. (the file handling bit)
   5 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   6 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   7 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   8 # (c) 2010-2018 Joe Perches <joe@perches.com>
   9
  10 use strict;
  11 use warnings;
  12 use POSIX;
  13 use File::Basename;
  14 use Cwd 'abs_path';
  15 use Term::ANSIColor qw(:constants);
  16 use Encode qw(decode encode);
  17
  18 my $P = $0;
  19 my $D = dirname(abs_path($P));
  20
  21 my $V = '0.32';
  22
  23 use Getopt::Long qw(:config no_auto_abbrev);
  24
  25 my $quiet = 0;
  26 my $tree = 1;
  27 my $chk_signoff = 1;
  28 my $chk_patch = 1;
  29 my $tst_only;
  30 my $emacs = 0;
  31 my $terse = 0;
  32 my $showfile = 0;
  33 my $file = 0;
  34 my $git = 0;
  35 my %git_commits = ();
  36 my $check = 0;
  37 my $check_orig = 0;
  38 my $summary = 1;
  39 my $mailback = 0;
  40 my $summary_file = 0;
  41 my $show_types = 0;
  42 my $list_types = 0;
  43 my $fix = 0;
  44 my $fix_inplace = 0;
  45 my $root;
  46 my %debug;
  47 my %camelcase = ();
  48 my %use_type = ();
  49 my @use = ();
  50 my %ignore_type = ();
  51 my @ignore = ();
  52 my $help = 0;
  53 my $configuration_file = ".checkpatch.conf";
  54 my $max_line_length = 100;
  55 my $ignore_perl_version = 0;
  56 my $minimum_perl_version = 5.10.0;
  57 my $min_conf_desc_length = 4;
  58 my $spelling_file = "$D/spelling.txt";
  59 my $codespell = 0;
  60 my $codespellfile = "/usr/share/codespell/dictionary.txt";
  61 my $conststructsfile = "$D/const_structs.checkpatch";
  62 my $typedefsfile = "";
  63 my $u_boot = 0;
  64 my $color = "auto";
  65 my $allow_c99_comments = 1; # Can be overridden by --ignore C99_COMMENT_TOLERANCE
  66 # git output parsing needs US English output, so first set backtick child process LANGUAGE
  67 my $git_command ='export LANGUAGE=en_US.UTF-8; git';
  68 my $tabsize = 8;
  69
  70 sub help {
  71         my ($exitcode) = @_;
  72
  73         print << "EOM";
  74 Usage: $P [OPTION]... [FILE]...
  75 Version: $V
  76
  77 Options:
  78   -q, --quiet                quiet
  79   --no-tree                  run without a kernel tree
  80   --no-signoff               do not check for 'Signed-off-by' line
  81   --patch                    treat FILE as patchfile (default)
  82   --emacs                    emacs compile window format
  83   --terse                    one line per report
  84   --showfile                 emit diffed file position, not input file position
  85   -g, --git                  treat FILE as a single commit or git revision range
  86                              single git commit with:
  87                                <rev>
  88                                <rev>^
  89                                <rev>~n
  90                              multiple git commits with:
  91                                <rev1>..<rev2>
  92                                <rev1>...<rev2>
  93                                <rev>-<count>
  94                              git merges are ignored
  95   -f, --file                 treat FILE as regular source file
  96   --subjective, --strict     enable more subjective tests
  97   --list-types               list the possible message types
  98   --types TYPE(,TYPE2...)    show only these comma separated message types
  99   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
 100   --show-types               show the specific message type in the output
 101   --max-line-length=n        set the maximum line length, (default $max_line_length)
 102                              if exceeded, warn on patches
 103                              requires --strict for use with --file
 104   --min-conf-desc-length=n   set the min description length, if shorter, warn
 105   --tab-size=n               set the number of spaces for tab (default $tabsize)
 106   --root=PATH                PATH to the kernel tree root
 107   --no-summary               suppress the per-file summary
 108   --mailback                 only produce a report in case of warnings/errors
 109   --summary-file             include the filename in summary
 110   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
 111                              'values', 'possible', 'type', and 'attr' (default
 112                              is all off)
 113   --test-only=WORD           report only warnings/errors containing WORD
 114                              literally
 115   --fix                      EXPERIMENTAL - may create horrible results
 116                              If correctable single-line errors exist, create
 117                              "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
 118                              with potential errors corrected to the preferred
 119                              checkpatch style
 120   --fix-inplace              EXPERIMENTAL - may create horrible results
 121                              Is the same as --fix, but overwrites the input
 122                              file.  It's your fault if there's no backup or git
 123   --ignore-perl-version      override checking of perl version.  expect
 124                              runtime errors.
 125   --codespell                Use the codespell dictionary for spelling/typos
 126                              (default:/usr/share/codespell/dictionary.txt)
 127   --codespellfile            Use this codespell dictionary
 128   --typedefsfile             Read additional types from this file
 129   --color[=WHEN]             Use colors 'always', 'never', or only when output
 130                              is a terminal ('auto'). Default is 'auto'.
 131   --u-boot                   Run additional checks for U-Boot
 132   -h, --help, --version      display this help and exit
 133
 134 When FILE is - read standard input.
 135 EOM
 136
 137         exit($exitcode);
 138 }
 139
 140 sub uniq {
 141         my %seen;
 142         return grep { !$seen{$_}++ } @_;
 143 }
 144
 145 sub list_types {
 146         my ($exitcode) = @_;
 147
 148         my $count = 0;
 149
 150         local $/ = undef;
 151
 152         open(my $script, '<', abs_path($P)) or
 153             die "$P: Can't read '$P' $!\n";
 154
 155         my $text = <$script>;
 156         close($script);
 157
 158         my @types = ();
 159         # Also catch when type or level is passed through a variable
 160         for ($text =~ /(?:(?:\bCHK|\bWARN|\bERROR|&\{\$msg_level})\s*\(|\$msg_type\s*=)\s*"([^"]+)"/g) {
 161                 push (@types, $_);
 162         }
 163         @types = sort(uniq(@types));
 164         print("#\tMessage type\n\n");
 165         foreach my $type (@types) {
 166                 print(++$count . "\t" . $type . "\n");
 167         }
 168
 169         exit($exitcode);
 170 }
 171
 172 my $conf = which_conf($configuration_file);
 173 if (-f $conf) {
 174         my @conf_args;
 175         open(my $conffile, '<', "$conf")
 176             or warn "$P: Can't find a readable $configuration_file file $!\n";
 177
 178         while (<$conffile>) {
 179                 my $line = $_;
 180
 181                 $line =~ s/\s*\n?$//g;
 182                 $line =~ s/^\s*//g;
 183                 $line =~ s/\s+/ /g;
 184
 185                 next if ($line =~ m/^\s*#/);
 186                 next if ($line =~ m/^\s*$/);
 187
 188                 my @words = split(" ", $line);
 189                 foreach my $word (@words) {
 190                         last if ($word =~ m/^#/);
 191                         push (@conf_args, $word);
 192                 }
 193         }
 194         close($conffile);
 195         unshift(@ARGV, @conf_args) if @conf_args;
 196 }
 197
 198 # Perl's Getopt::Long allows options to take optional arguments after a space.
 199 # Prevent --color by itself from consuming other arguments
 200 foreach (@ARGV) {
 201         if ($_ eq "--color" || $_ eq "-color") {
 202                 $_ = "--color=$color";
 203         }
 204 }
 205
 206 GetOptions(
 207         'q|quiet+'      => \$quiet,
 208         'tree!'         => \$tree,
 209         'signoff!'      => \$chk_signoff,
 210         'patch!'        => \$chk_patch,
 211         'emacs!'        => \$emacs,
 212         'terse!'        => \$terse,
 213         'showfile!'     => \$showfile,
 214         'f|file!'       => \$file,
 215         'g|git!'        => \$git,
 216         'subjective!'   => \$check,
 217         'strict!'       => \$check,
 218         'ignore=s'      => \@ignore,
 219         'types=s'       => \@use,
 220         'show-types!'   => \$show_types,
 221         'list-types!'   => \$list_types,
 222         'max-line-length=i' => \$max_line_length,
 223         'min-conf-desc-length=i' => \$min_conf_desc_length,
 224         'tab-size=i'    => \$tabsize,
 225         'root=s'        => \$root,
 226         'summary!'      => \$summary,
 227         'mailback!'     => \$mailback,
 228         'summary-file!' => \$summary_file,
 229         'fix!'          => \$fix,
 230         'fix-inplace!'  => \$fix_inplace,
 231         'ignore-perl-version!' => \$ignore_perl_version,
 232         'debug=s'       => \%debug,
 233         'test-only=s'   => \$tst_only,
 234         'codespell!'    => \$codespell,
 235         'codespellfile=s'       => \$codespellfile,
 236         'typedefsfile=s'        => \$typedefsfile,
 237         'u-boot'        => \$u_boot,
 238         'color=s'       => \$color,
 239         'no-color'      => \$color,     #keep old behaviors of -nocolor
 240         'nocolor'       => \$color,     #keep old behaviors of -nocolor
 241         'h|help'        => \$help,
 242         'version'       => \$help
 243 ) or help(1);
 244
 245 help(0) if ($help);
 246
 247 list_types(0) if ($list_types);
 248
 249 $fix = 1 if ($fix_inplace);
 250 $check_orig = $check;
 251
 252 my $exit = 0;
 253
 254 my $perl_version_ok = 1;
 255 if ($^V && $^V lt $minimum_perl_version) {
 256         $perl_version_ok = 0;
 257         printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
 258         exit(1) if (!$ignore_perl_version);
 259 }
 260
 261 #if no filenames are given, push '-' to read patch from stdin
 262 if ($#ARGV < 0) {
 263         push(@ARGV, '-');
 264 }
 265
 266 if ($color =~ /^[01]$/) {
 267         $color = !$color;
 268 } elsif ($color =~ /^always$/i) {
 269         $color = 1;
 270 } elsif ($color =~ /^never$/i) {
 271         $color = 0;
 272 } elsif ($color =~ /^auto$/i) {
 273         $color = (-t STDOUT);
 274 } else {
 275         die "Invalid color mode: $color\n";
 276 }
 277
 278 # skip TAB size 1 to avoid additional checks on $tabsize - 1
 279 die "Invalid TAB size: $tabsize\n" if ($tabsize < 2);
 280
 281 sub hash_save_array_words {
 282         my ($hashRef, $arrayRef) = @_;
 283
 284         my @array = split(/,/, join(',', @$arrayRef));
 285         foreach my $word (@array) {
 286                 $word =~ s/\s*\n?$//g;
 287                 $word =~ s/^\s*//g;
 288                 $word =~ s/\s+/ /g;
 289                 $word =~ tr/[a-z]/[A-Z]/;
 290
 291                 next if ($word =~ m/^\s*#/);
 292                 next if ($word =~ m/^\s*$/);
 293
 294                 $hashRef->{$word}++;
 295         }
 296 }
 297
 298 sub hash_show_words {
 299         my ($hashRef, $prefix) = @_;
 300
 301         if (keys %$hashRef) {
 302                 print "\nNOTE: $prefix message types:";
 303                 foreach my $word (sort keys %$hashRef) {
 304                         print " $word";
 305                 }
 306                 print "\n";
 307         }
 308 }
 309
 310 hash_save_array_words(\%ignore_type, \@ignore);
 311 hash_save_array_words(\%use_type, \@use);
 312
 313 my $dbg_values = 0;
 314 my $dbg_possible = 0;
 315 my $dbg_type = 0;
 316 my $dbg_attr = 0;
 317 for my $key (keys %debug) {
 318         ## no critic
 319         eval "\${dbg_$key} = '$debug{$key}';";
 320         die "$@" if ($@);
 321 }
 322
 323 my $rpt_cleaners = 0;
 324
 325 if ($terse) {
 326         $emacs = 1;
 327         $quiet++;
 328 }
 329
 330 if ($tree) {
 331         if (defined $root) {
 332                 if (!top_of_kernel_tree($root)) {
 333                         die "$P: $root: --root does not point at a valid tree\n";
 334                 }
 335         } else {
 336                 if (top_of_kernel_tree('.')) {
 337                         $root = '.';
 338                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 339                                                 top_of_kernel_tree($1)) {
 340                         $root = $1;
 341                 }
 342         }
 343
 344         if (!defined $root) {
 345                 print "Must be run from the top-level dir. of a kernel tree\n";
 346                 exit(2);
 347         }
 348 }
 349
 350 my $emitted_corrupt = 0;
 351
 352 our $Ident      = qr{
 353                         [A-Za-z_][A-Za-z\d_]*
 354                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 355                 }x;
 356 our $Storage    = qr{extern|static|asmlinkage};
 357 our $Sparse     = qr{
 358                         __user|
 359                         __kernel|
 360                         __force|
 361                         __iomem|
 362                         __must_check|
 363                         __kprobes|
 364                         __ref|
 365                         __refconst|
 366                         __refdata|
 367                         __rcu|
 368                         __private
 369                 }x;
 370 our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
 371 our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
 372 our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
 373 our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
 374 our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};
 375
 376 # Notes to $Attribute:
 377 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 378 our $Attribute  = qr{
 379                         const|
 380                         __percpu|
 381                         __nocast|
 382                         __safe|
 383                         __bitwise|
 384                         __packed__|
 385                         __packed2__|
 386                         __naked|
 387                         __maybe_unused|
 388                         __always_unused|
 389                         __noreturn|
 390                         __used|
 391                         __cold|
 392                         __pure|
 393                         __noclone|
 394                         __deprecated|
 395                         __read_mostly|
 396                         __ro_after_init|
 397                         __kprobes|
 398                         $InitAttribute|
 399                         ____cacheline_aligned|
 400                         ____cacheline_aligned_in_smp|
 401                         ____cacheline_internodealigned_in_smp|
 402                         __weak
 403                   }x;
 404 our $Modifier;
 405 our $Inline     = qr{inline|__always_inline|noinline|__inline|__inline__};
 406 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 407 our $Lval       = qr{$Ident(?:$Member)*};
 408
 409 our $Int_type   = qr{(?i)llu|ull|ll|lu|ul|l|u};
 410 our $Binary     = qr{(?i)0b[01]+$Int_type?};
 411 our $Hex        = qr{(?i)0x[0-9a-f]+$Int_type?};
 412 our $Int        = qr{[0-9]+$Int_type?};
 413 our $Octal      = qr{0[0-7]+$Int_type?};
 414 our $String     = qr{"[X\t]*"};
 415 our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 416 our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 417 our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 418 our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 419 our $Constant   = qr{$Float|$Binary|$Octal|$Hex|$Int};
 420 our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 421 our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
 422 our $Arithmetic = qr{\+|-|\*|\/|%};
 423 our $Operators  = qr{
 424                         <=|>=|==|!=|
 425                         =>|->|<<|>>|<|>|!|~|
 426                         &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
 427                   }x;
 428
 429 our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;
 430
 431 our $BasicType;
 432 our $NonptrType;
 433 our $NonptrTypeMisordered;
 434 our $NonptrTypeWithAttr;
 435 our $Type;
 436 our $TypeMisordered;
 437 our $Declare;
 438 our $DeclareMisordered;
 439
 440 our $NON_ASCII_UTF8     = qr{
 441         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 442         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 443         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 444         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 445         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 446         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 447         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 448 }x;
 449
 450 our $UTF8       = qr{
 451         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 452         | $NON_ASCII_UTF8
 453 }x;
 454
 455 our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
 456 our $typeOtherOSTypedefs = qr{(?x:
 457         u_(?:char|short|int|long) |          # bsd
 458         u(?:nchar|short|int|long)            # sysv
 459 )};
 460 our $typeKernelTypedefs = qr{(?x:
 461         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 462         atomic_t
 463 )};
 464 our $typeTypedefs = qr{(?x:
 465         $typeC99Typedefs\b|
 466         $typeOtherOSTypedefs\b|
 467         $typeKernelTypedefs\b
 468 )};
 469
 470 our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b};
 471
 472 our $logFunctions = qr{(?x:
 473         printk(?:_ratelimited|_once|_deferred_once|_deferred|)|
 474         (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 475         TP_printk|
 476         WARN(?:_RATELIMIT|_ONCE|)|
 477         panic|
 478         debug|
 479         printf|
 480         MODULE_[A-Z_]+|
 481         seq_vprintf|seq_printf|seq_puts
 482 )};
 483
 484 our $allocFunctions = qr{(?x:
 485         (?:(?:devm_)?
 486                 (?:kv|k|v)[czm]alloc(?:_node|_array)? |
 487                 kstrdup(?:_const)? |
 488                 kmemdup(?:_nul)?) |
 489         (?:\w+)?alloc_skb(?:_ip_align)? |
 490                                 # dev_alloc_skb/netdev_alloc_skb, et al
 491         dma_alloc_coherent
 492 )};
 493
 494 our $signature_tags = qr{(?xi:
 495         Signed-off-by:|
 496         Co-developed-by:|
 497         Acked-by:|
 498         Tested-by:|
 499         Reviewed-by:|
 500         Reported-by:|
 501         Suggested-by:|
 502         To:|
 503         Cc:
 504 )};
 505
 506 our @typeListMisordered = (
 507         qr{char\s+(?:un)?signed},
 508         qr{int\s+(?:(?:un)?signed\s+)?short\s},
 509         qr{int\s+short(?:\s+(?:un)?signed)},
 510         qr{short\s+int(?:\s+(?:un)?signed)},
 511         qr{(?:un)?signed\s+int\s+short},
 512         qr{short\s+(?:un)?signed},
 513         qr{long\s+int\s+(?:un)?signed},
 514         qr{int\s+long\s+(?:un)?signed},
 515         qr{long\s+(?:un)?signed\s+int},
 516         qr{int\s+(?:un)?signed\s+long},
 517         qr{int\s+(?:un)?signed},
 518         qr{int\s+long\s+long\s+(?:un)?signed},
 519         qr{long\s+long\s+int\s+(?:un)?signed},
 520         qr{long\s+long\s+(?:un)?signed\s+int},
 521         qr{long\s+long\s+(?:un)?signed},
 522         qr{long\s+(?:un)?signed},
 523 );
 524
 525 our @typeList = (
 526         qr{void},
 527         qr{(?:(?:un)?signed\s+)?char},
 528         qr{(?:(?:un)?signed\s+)?short\s+int},
 529         qr{(?:(?:un)?signed\s+)?short},
 530         qr{(?:(?:un)?signed\s+)?int},
 531         qr{(?:(?:un)?signed\s+)?long\s+int},
 532         qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
 533         qr{(?:(?:un)?signed\s+)?long\s+long},
 534         qr{(?:(?:un)?signed\s+)?long},
 535         qr{(?:un)?signed},
 536         qr{float},
 537         qr{double},
 538         qr{bool},
 539         qr{struct\s+$Ident},
 540         qr{union\s+$Ident},
 541         qr{enum\s+$Ident},
 542         qr{${Ident}_t},
 543         qr{${Ident}_handler},
 544         qr{${Ident}_handler_fn},
 545         @typeListMisordered,
 546 );
 547
 548 our $C90_int_types = qr{(?x:
 549         long\s+long\s+int\s+(?:un)?signed|
 550         long\s+long\s+(?:un)?signed\s+int|
 551         long\s+long\s+(?:un)?signed|
 552         (?:(?:un)?signed\s+)?long\s+long\s+int|
 553         (?:(?:un)?signed\s+)?long\s+long|
 554         int\s+long\s+long\s+(?:un)?signed|
 555         int\s+(?:(?:un)?signed\s+)?long\s+long|
 556
 557         long\s+int\s+(?:un)?signed|
 558         long\s+(?:un)?signed\s+int|
 559         long\s+(?:un)?signed|
 560         (?:(?:un)?signed\s+)?long\s+int|
 561         (?:(?:un)?signed\s+)?long|
 562         int\s+long\s+(?:un)?signed|
 563         int\s+(?:(?:un)?signed\s+)?long|
 564
 565         int\s+(?:un)?signed|
 566         (?:(?:un)?signed\s+)?int
 567 )};
 568
 569 our @typeListFile = ();
 570 our @typeListWithAttr = (
 571         @typeList,
 572         qr{struct\s+$InitAttribute\s+$Ident},
 573         qr{union\s+$InitAttribute\s+$Ident},
 574 );
 575
 576 our @modifierList = (
 577         qr{fastcall},
 578 );
 579 our @modifierListFile = ();
 580
 581 our @mode_permission_funcs = (
 582         ["module_param", 3],
 583         ["module_param_(?:array|named|string)", 4],
 584         ["module_param_array_named", 5],
 585         ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
 586         ["proc_create(?:_data|)", 2],
 587         ["(?:CLASS|DEVICE|SENSOR|SENSOR_DEVICE|IIO_DEVICE)_ATTR", 2],
 588         ["IIO_DEV_ATTR_[A-Z_]+", 1],
 589         ["SENSOR_(?:DEVICE_|)ATTR_2", 2],
 590         ["SENSOR_TEMPLATE(?:_2|)", 3],
 591         ["__ATTR", 2],
 592 );
 593
 594 #Create a search pattern for all these functions to speed up a loop below
 595 our $mode_perms_search = "";
 596 foreach my $entry (@mode_permission_funcs) {
 597         $mode_perms_search .= '|' if ($mode_perms_search ne "");
 598         $mode_perms_search .= $entry->[0];
 599 }
 600 $mode_perms_search = "(?:${mode_perms_search})";
 601
 602 our %deprecated_apis = (
 603         "synchronize_rcu_bh"                    => "synchronize_rcu",
 604         "synchronize_rcu_bh_expedited"          => "synchronize_rcu_expedited",
 605         "call_rcu_bh"                           => "call_rcu",
 606         "rcu_barrier_bh"                        => "rcu_barrier",
 607         "synchronize_sched"                     => "synchronize_rcu",
 608         "synchronize_sched_expedited"           => "synchronize_rcu_expedited",
 609         "call_rcu_sched"                        => "call_rcu",
 610         "rcu_barrier_sched"                     => "rcu_barrier",
 611         "get_state_synchronize_sched"           => "get_state_synchronize_rcu",
 612         "cond_synchronize_sched"                => "cond_synchronize_rcu",
 613 );
 614
 615 #Create a search pattern for all these strings to speed up a loop below
 616 our $deprecated_apis_search = "";
 617 foreach my $entry (keys %deprecated_apis) {
 618         $deprecated_apis_search .= '|' if ($deprecated_apis_search ne "");
 619         $deprecated_apis_search .= $entry;
 620 }
 621 $deprecated_apis_search = "(?:${deprecated_apis_search})";
 622
 623 our $mode_perms_world_writable = qr{
 624         S_IWUGO         |
 625         S_IWOTH         |
 626         S_IRWXUGO       |
 627         S_IALLUGO       |
 628         0[0-7][0-7][2367]
 629 }x;
 630
 631 our %mode_permission_string_types = (
 632         "S_IRWXU" => 0700,
 633         "S_IRUSR" => 0400,
 634         "S_IWUSR" => 0200,
 635         "S_IXUSR" => 0100,
 636         "S_IRWXG" => 0070,
 637         "S_IRGRP" => 0040,
 638         "S_IWGRP" => 0020,
 639         "S_IXGRP" => 0010,
 640         "S_IRWXO" => 0007,
 641         "S_IROTH" => 0004,
 642         "S_IWOTH" => 0002,
 643         "S_IXOTH" => 0001,
 644         "S_IRWXUGO" => 0777,
 645         "S_IRUGO" => 0444,
 646         "S_IWUGO" => 0222,
 647         "S_IXUGO" => 0111,
 648 );
 649
 650 #Create a search pattern for all these strings to speed up a loop below
 651 our $mode_perms_string_search = "";
 652 foreach my $entry (keys %mode_permission_string_types) {
 653         $mode_perms_string_search .= '|' if ($mode_perms_string_search ne "");
 654         $mode_perms_string_search .= $entry;
 655 }
 656 our $single_mode_perms_string_search = "(?:${mode_perms_string_search})";
 657 our $multi_mode_perms_string_search = qr{
 658         ${single_mode_perms_string_search}
 659         (?:\s*\|\s*${single_mode_perms_string_search})*
 660 }x;
 661
 662 sub perms_to_octal {
 663         my ($string) = @_;
 664
 665         return trim($string) if ($string =~ /^\s*0[0-7]{3,3}\s*$/);
 666
 667         my $val = "";
 668         my $oval = "";
 669         my $to = 0;
 670         my $curpos = 0;
 671         my $lastpos = 0;
 672         while ($string =~ /\b(($single_mode_perms_string_search)\b(?:\s*\|\s*)?\s*)/g) {
 673                 $curpos = pos($string);
 674                 my $match = $2;
 675                 my $omatch = $1;
 676                 last if ($lastpos > 0 && ($curpos - length($omatch) != $lastpos));
 677                 $lastpos = $curpos;
 678                 $to |= $mode_permission_string_types{$match};
 679                 $val .= '\s*\|\s*' if ($val ne "");
 680                 $val .= $match;
 681                 $oval .= $omatch;
 682         }
 683         $oval =~ s/^\s*\|\s*//;
 684         $oval =~ s/\s*\|\s*$//;
 685         return sprintf("%04o", $to);
 686 }
 687
 688 our $allowed_asm_includes = qr{(?x:
 689         irq|
 690         memory|
 691         time|
 692         reboot
 693 )};
 694 # memory.h: ARM has a custom one
 695
 696 # Load common spelling mistakes and build regular expression list.
 697 my $misspellings;
 698 my %spelling_fix;
 699
 700 if (open(my $spelling, '<', $spelling_file)) {
 701         while (<$spelling>) {
 702                 my $line = $_;
 703
 704                 $line =~ s/\s*\n?$//g;
 705                 $line =~ s/^\s*//g;
 706
 707                 next if ($line =~ m/^\s*#/);
 708                 next if ($line =~ m/^\s*$/);
 709
 710                 my ($suspect, $fix) = split(/\|\|/, $line);
 711
 712                 $spelling_fix{$suspect} = $fix;
 713         }
 714         close($spelling);
 715 } else {
 716         warn "No typos will be found - file '$spelling_file': $!\n";
 717 }
 718
 719 if ($codespell) {
 720         if (open(my $spelling, '<', $codespellfile)) {
 721                 while (<$spelling>) {
 722                         my $line = $_;
 723
 724                         $line =~ s/\s*\n?$//g;
 725                         $line =~ s/^\s*//g;
 726
 727                         next if ($line =~ m/^\s*#/);
 728                         next if ($line =~ m/^\s*$/);
 729                         next if ($line =~ m/, disabled/i);
 730
 731                         $line =~ s/,.*$//;
 732
 733                         my ($suspect, $fix) = split(/->/, $line);
 734
 735                         $spelling_fix{$suspect} = $fix;
 736                 }
 737                 close($spelling);
 738         } else {
 739                 warn "No codespell typos will be found - file '$codespellfile': $!\n";
 740         }
 741 }
 742
 743 $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;
 744
 745 sub read_words {
 746         my ($wordsRef, $file) = @_;
 747
 748         if (open(my $words, '<', $file)) {
 749                 while (<$words>) {
 750                         my $line = $_;
 751
 752                         $line =~ s/\s*\n?$//g;
 753                         $line =~ s/^\s*//g;
 754
 755                         next if ($line =~ m/^\s*#/);
 756                         next if ($line =~ m/^\s*$/);
 757                         if ($line =~ /\s/) {
 758                                 print("$file: '$line' invalid - ignored\n");
 759                                 next;
 760                         }
 761
 762                         $$wordsRef .= '|' if ($$wordsRef ne "");
 763                         $$wordsRef .= $line;
 764                 }
 765                 close($file);
 766                 return 1;
 767         }
 768
 769         return 0;
 770 }
 771
 772 my $const_structs = "";
 773 read_words(\$const_structs, $conststructsfile)
 774     or warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
 775
 776 my $typeOtherTypedefs = "";
 777 if (length($typedefsfile)) {
 778         read_words(\$typeOtherTypedefs, $typedefsfile)
 779             or warn "No additional types will be considered - file '$typedefsfile': $!\n";
 780 }
 781 $typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne "");
 782
 783 sub build_types {
 784         my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
 785         my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
 786         my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
 787         my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
 788         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 789         $BasicType      = qr{
 790                                 (?:$typeTypedefs\b)|
 791                                 (?:${all}\b)
 792                 }x;
 793         $NonptrType     = qr{
 794                         (?:$Modifier\s+|const\s+)*
 795                         (?:
 796                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 797                                 (?:$typeTypedefs\b)|
 798                                 (?:${all}\b)
 799                         )
 800                         (?:\s+$Modifier|\s+const)*
 801                   }x;
 802         $NonptrTypeMisordered   = qr{
 803                         (?:$Modifier\s+|const\s+)*
 804                         (?:
 805                                 (?:${Misordered}\b)
 806                         )
 807                         (?:\s+$Modifier|\s+const)*
 808                   }x;
 809         $NonptrTypeWithAttr     = qr{
 810                         (?:$Modifier\s+|const\s+)*
 811                         (?:
 812                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 813                                 (?:$typeTypedefs\b)|
 814                                 (?:${allWithAttr}\b)
 815                         )
 816                         (?:\s+$Modifier|\s+const)*
 817                   }x;
 818         $Type   = qr{
 819                         $NonptrType
 820                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+){0,4}
 821                         (?:\s+$Inline|\s+$Modifier)*
 822                   }x;
 823         $TypeMisordered = qr{
 824                         $NonptrTypeMisordered
 825                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+){0,4}
 826                         (?:\s+$Inline|\s+$Modifier)*
 827                   }x;
 828         $Declare        = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
 829         $DeclareMisordered      = qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
 830 }
 831 build_types();
 832
 833 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 834
 835 # Using $balanced_parens, $LvalOrFunc, or $FuncArg
 836 # requires at least perl version v5.10.0
 837 # Any use must be runtime checked with $^V
 838
 839 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 840 our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
 841 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};
 842
 843 our $declaration_macros = qr{(?x:
 844         (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
 845         (?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|
 846         (?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(|
 847         (?:SKCIPHER_REQUEST|SHASH_DESC|AHASH_REQUEST)_ON_STACK\s*\(
 848 )};
 849
 850 sub deparenthesize {
 851         my ($string) = @_;
 852         return "" if (!defined($string));
 853
 854         while ($string =~ /^\s*\(.*\)\s*$/) {
 855                 $string =~ s@^\s*\(\s*@@;
 856                 $string =~ s@\s*\)\s*$@@;
 857         }
 858
 859         $string =~ s@\s+@ @g;
 860
 861         return $string;
 862 }
 863
 864 sub seed_camelcase_file {
 865         my ($file) = @_;
 866
 867         return if (!(-f $file));
 868
 869         local $/;
 870
 871         open(my $include_file, '<', "$file")
 872             or warn "$P: Can't read '$file' $!\n";
 873         my $text = <$include_file>;
 874         close($include_file);
 875
 876         my @lines = split('\n', $text);
 877
 878         foreach my $line (@lines) {
 879                 next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
 880                 if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
 881                         $camelcase{$1} = 1;
 882                 } elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
 883                         $camelcase{$1} = 1;
 884                 } elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
 885                         $camelcase{$1} = 1;
 886                 }
 887         }
 888 }
 889
 890 our %maintained_status = ();
 891
 892 sub is_maintained_obsolete {
 893         my ($filename) = @_;
 894
 895         return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));
 896
 897         if (!exists($maintained_status{$filename})) {
 898                 $maintained_status{$filename} = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`;
 899         }
 900
 901         return $maintained_status{$filename} =~ /obsolete/i;
 902 }
 903
 904 sub is_SPDX_License_valid {
 905         my ($license) = @_;
 906
 907         return 1 if (!$tree || which("python") eq "" || !(-e "$root/scripts/spdxcheck.py") || !(-e "$root/.git"));
 908
 909         my $root_path = abs_path($root);
 910         my $status = `cd "$root_path"; echo "$license" | python scripts/spdxcheck.py -`;
 911         return 0 if ($status ne "");
 912         return 1;
 913 }
 914
 915 my $camelcase_seeded = 0;
 916 sub seed_camelcase_includes {
 917         return if ($camelcase_seeded);
 918
 919         my $files;
 920         my $camelcase_cache = "";
 921         my @include_files = ();
 922
 923         $camelcase_seeded = 1;
 924
 925         if (-e ".git") {
 926                 my $git_last_include_commit = `${git_command} log --no-merges --pretty=format:"%h%n" -1 -- include`;
 927                 chomp $git_last_include_commit;
 928                 $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
 929         } else {
 930                 my $last_mod_date = 0;
 931                 $files = `find $root/include -name "*.h"`;
 932                 @include_files = split('\n', $files);
 933                 foreach my $file (@include_files) {
 934                         my $date = POSIX::strftime("%Y%m%d%H%M",
 935                                                    localtime((stat $file)[9]));
 936                         $last_mod_date = $date if ($last_mod_date < $date);
 937                 }
 938                 $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
 939         }
 940
 941         if ($camelcase_cache ne "" && -f $camelcase_cache) {
 942                 open(my $camelcase_file, '<', "$camelcase_cache")
 943                     or warn "$P: Can't read '$camelcase_cache' $!\n";
 944                 while (<$camelcase_file>) {
 945                         chomp;
 946                         $camelcase{$_} = 1;
 947                 }
 948                 close($camelcase_file);
 949
 950                 return;
 951         }
 952
 953         if (-e ".git") {
 954                 $files = `${git_command} ls-files "include/*.h"`;
 955                 @include_files = split('\n', $files);
 956         }
 957
 958         foreach my $file (@include_files) {
 959                 seed_camelcase_file($file);
 960         }
 961
 962         if ($camelcase_cache ne "") {
 963                 unlink glob ".checkpatch-camelcase.*";
 964                 open(my $camelcase_file, '>', "$camelcase_cache")
 965                     or warn "$P: Can't write '$camelcase_cache' $!\n";
 966                 foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
 967                         print $camelcase_file ("$_\n");
 968                 }
 969                 close($camelcase_file);
 970         }
 971 }
 972
 973 sub git_commit_info {
 974         my ($commit, $id, $desc) = @_;
 975
 976         return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
 977
 978         my $output = `${git_command} log --no-color --format='%H %s' -1 $commit 2>&1`;
 979         $output =~ s/^\s*//gm;
 980         my @lines = split("\n", $output);
 981
 982         return ($id, $desc) if ($#lines < 0);
 983
 984         if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous/) {
 985 # Maybe one day convert this block of bash into something that returns
 986 # all matching commit ids, but it's very slow...
 987 #
 988 #               echo "checking commits $1..."
 989 #               git rev-list --remotes | grep -i "^$1" |
 990 #               while read line ; do
 991 #                   git log --format='%H %s' -1 $line |
 992 #                   echo "commit $(cut -c 1-12,41-)"
 993 #               done
 994         } elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
 995                 $id = undef;
 996         } else {
 997                 $id = substr($lines[0], 0, 12);
 998                 $desc = substr($lines[0], 41);
 999         }
1000
1001         return ($id, $desc);
1002 }
1003
1004 $chk_signoff = 0 if ($file);
1005
1006 my @rawlines = ();
1007 my @lines = ();
1008 my @fixed = ();
1009 my @fixed_inserted = ();
1010 my @fixed_deleted = ();
1011 my $fixlinenr = -1;
1012
1013 # If input is git commits, extract all commits from the commit expressions.
1014 # For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
1015 die "$P: No git repository found\n" if ($git && !-e ".git");
1016
1017 if ($git) {
1018         my @commits = ();
1019         foreach my $commit_expr (@ARGV) {
1020                 my $git_range;
1021                 if ($commit_expr =~ m/^(.*)-(\d+)$/) {
1022                         $git_range = "-$2 $1";
1023                 } elsif ($commit_expr =~ m/\.\./) {
1024                         $git_range = "$commit_expr";
1025                 } else {
1026                         $git_range = "-1 $commit_expr";
1027                 }
1028                 my $lines = `${git_command} log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
1029                 foreach my $line (split(/\n/, $lines)) {
1030                         $line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
1031                         next if (!defined($1) || !defined($2));
1032                         my $sha1 = $1;
1033                         my $subject = $2;
1034                         unshift(@commits, $sha1);
1035                         $git_commits{$sha1} = $subject;
1036                 }
1037         }
1038         die "$P: no git commits after extraction!\n" if (@commits == 0);
1039         @ARGV = @commits;
1040 }
1041
1042 my $vname;
1043 $allow_c99_comments = !defined $ignore_type{"C99_COMMENT_TOLERANCE"};
1044 for my $filename (@ARGV) {
1045         my $FILE;
1046         if ($git) {
1047                 open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
1048                         die "$P: $filename: git format-patch failed - $!\n";
1049         } elsif ($file) {
1050                 open($FILE, '-|', "diff -u /dev/null $filename") ||
1051                         die "$P: $filename: diff failed - $!\n";
1052         } elsif ($filename eq '-') {
1053                 open($FILE, '<&STDIN');
1054         } else {
1055                 open($FILE, '<', "$filename") ||
1056                         die "$P: $filename: open failed - $!\n";
1057         }
1058         if ($filename eq '-') {
1059                 $vname = 'Your patch';
1060         } elsif ($git) {
1061                 $vname = "Commit " . substr($filename, 0, 12) . ' ("' . $git_commits{$filename} . '")';
1062         } else {
1063                 $vname = $filename;
1064         }
1065         while (<$FILE>) {
1066                 chomp;
1067                 push(@rawlines, $_);
1068         }
1069         close($FILE);
1070
1071         if ($#ARGV > 0 && $quiet == 0) {
1072                 print '-' x length($vname) . "\n";
1073                 print "$vname\n";
1074                 print '-' x length($vname) . "\n";
1075         }
1076
1077         if (!process($filename)) {
1078                 $exit = 1;
1079         }
1080         @rawlines = ();
1081         @lines = ();
1082         @fixed = ();
1083         @fixed_inserted = ();
1084         @fixed_deleted = ();
1085         $fixlinenr = -1;
1086         @modifierListFile = ();
1087         @typeListFile = ();
1088         build_types();
1089 }
1090
1091 if (!$quiet) {
1092         hash_show_words(\%use_type, "Used");
1093         hash_show_words(\%ignore_type, "Ignored");
1094
1095         if (!$perl_version_ok) {
1096                 print << "EOM"
1097
1098 NOTE: perl $^V is not modern enough to detect all possible issues.
1099       An upgrade to at least perl $minimum_perl_version is suggested.
1100 EOM
1101         }
1102         if ($exit) {
1103                 print << "EOM"
1104
1105 NOTE: If any of the errors are false positives, please report
1106       them to the maintainer, see CHECKPATCH in MAINTAINERS.
1107 EOM
1108         }
1109 }
1110
1111 exit($exit);
1112
1113 sub top_of_kernel_tree {
1114         my ($root) = @_;
1115
1116         my @tree_check = (
1117                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
1118                 "README", "Documentation", "arch", "include", "drivers",
1119                 "fs", "init", "ipc", "kernel", "lib", "scripts",
1120         );
1121
1122         foreach my $check (@tree_check) {
1123                 if (! -e $root . '/' . $check) {
1124                         return 0;
1125                 }
1126         }
1127         return 1;
1128 }
1129
1130 sub parse_email {
1131         my ($formatted_email) = @_;
1132
1133         my $name = "";
1134         my $name_comment = "";
1135         my $address = "";
1136         my $comment = "";
1137
1138         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
1139                 $name = $1;
1140                 $address = $2;
1141                 $comment = $3 if defined $3;
1142         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
1143                 $address = $1;
1144                 $comment = $2 if defined $2;
1145         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
1146                 $address = $1;
1147                 $comment = $2 if defined $2;
1148                 $formatted_email =~ s/\Q$address\E.*$//;
1149                 $name = $formatted_email;
1150                 $name = trim($name);
1151                 $name =~ s/^\"|\"$//g;
1152                 # If there's a name left after stripping spaces and
1153                 # leading quotes, and the address doesn't have both
1154                 # leading and trailing angle brackets, the address
1155                 # is invalid. ie:
1156                 #   "joe smith joe@smith.com" bad
1157                 #   "joe smith <joe@smith.com" bad
1158                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
1159                         $name = "";
1160                         $address = "";
1161                         $comment = "";
1162                 }
1163         }
1164
1165         $name = trim($name);
1166         $name =~ s/^\"|\"$//g;
1167         $name =~ s/(\s*\([^\)]+\))\s*//;
1168         if (defined($1)) {
1169                 $name_comment = trim($1);
1170         }
1171         $address = trim($address);
1172         $address =~ s/^\<|\>$//g;
1173
1174         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
1175                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
1176                 $name = "\"$name\"";
1177         }
1178
1179         return ($name, $name_comment, $address, $comment);
1180 }
1181
1182 sub format_email {
1183         my ($name, $address) = @_;
1184
1185         my $formatted_email;
1186
1187         $name = trim($name);
1188         $name =~ s/^\"|\"$//g;
1189         $address = trim($address);
1190
1191         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
1192                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
1193                 $name = "\"$name\"";
1194         }
1195
1196         if ("$name" eq "") {
1197                 $formatted_email = "$address";
1198         } else {
1199                 $formatted_email = "$name <$address>";
1200         }
1201
1202         return $formatted_email;
1203 }
1204
1205 sub reformat_email {
1206         my ($email) = @_;
1207
1208         my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
1209         return format_email($email_name, $email_address);
1210 }
1211
1212 sub same_email_addresses {
1213         my ($email1, $email2) = @_;
1214
1215         my ($email1_name, $name1_comment, $email1_address, $comment1) = parse_email($email1);
1216         my ($email2_name, $name2_comment, $email2_address, $comment2) = parse_email($email2);
1217
1218         return $email1_name eq $email2_name &&
1219                $email1_address eq $email2_address;
1220 }
1221
1222 sub which {
1223         my ($bin) = @_;
1224
1225         foreach my $path (split(/:/, $ENV{PATH})) {
1226                 if (-e "$path/$bin") {
1227                         return "$path/$bin";
1228                 }
1229         }
1230
1231         return "";
1232 }
1233
1234 sub which_conf {
1235         my ($conf) = @_;
1236
1237         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
1238                 if (-e "$path/$conf") {
1239                         return "$path/$conf";
1240                 }
1241         }
1242
1243         return "";
1244 }
1245
1246 sub expand_tabs {
1247         my ($str) = @_;
1248
1249         my $res = '';
1250         my $n = 0;
1251         for my $c (split(//, $str)) {
1252                 if ($c eq "\t") {
1253                         $res .= ' ';
1254                         $n++;
1255                         for (; ($n % $tabsize) != 0; $n++) {
1256                                 $res .= ' ';
1257                         }
1258                         next;
1259                 }
1260                 $res .= $c;
1261                 $n++;
1262         }
1263
1264         return $res;
1265 }
1266 sub copy_spacing {
1267         (my $res = shift) =~ tr/\t/ /c;
1268         return $res;
1269 }
1270
1271 sub line_stats {
1272         my ($line) = @_;
1273
1274         # Drop the diff line leader and expand tabs
1275         $line =~ s/^.//;
1276         $line = expand_tabs($line);
1277
1278         # Pick the indent from the front of the line.
1279         my ($white) = ($line =~ /^(\s*)/);
1280
1281         return (length($line), length($white));
1282 }
1283
1284 my $sanitise_quote = '';
1285
1286 sub sanitise_line_reset {
1287         my ($in_comment) = @_;
1288
1289         if ($in_comment) {
1290                 $sanitise_quote = '*/';
1291         } else {
1292                 $sanitise_quote = '';
1293         }
1294 }
1295 sub sanitise_line {
1296         my ($line) = @_;
1297
1298         my $res = '';
1299         my $l = '';
1300
1301         my $qlen = 0;
1302         my $off = 0;
1303         my $c;
1304
1305         # Always copy over the diff marker.
1306         $res = substr($line, 0, 1);
1307
1308         for ($off = 1; $off < length($line); $off++) {
1309                 $c = substr($line, $off, 1);
1310
1311                 # Comments we are whacking completely including the begin
1312                 # and end, all to $;.
1313                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
1314                         $sanitise_quote = '*/';
1315
1316                         substr($res, $off, 2, "$;$;");
1317                         $off++;
1318                         next;
1319                 }
1320                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
1321                         $sanitise_quote = '';
1322                         substr($res, $off, 2, "$;$;");
1323                         $off++;
1324                         next;
1325                 }
1326                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
1327                         $sanitise_quote = '//';
1328
1329                         substr($res, $off, 2, $sanitise_quote);
1330                         $off++;
1331                         next;
1332                 }
1333
1334                 # A \ in a string means ignore the next character.
1335                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
1336                     $c eq "\\") {
1337                         substr($res, $off, 2, 'XX');
1338                         $off++;
1339                         next;
1340                 }
1341                 # Regular quotes.
1342                 if ($c eq "'" || $c eq '"') {
1343                         if ($sanitise_quote eq '') {
1344                                 $sanitise_quote = $c;
1345
1346                                 substr($res, $off, 1, $c);
1347                                 next;
1348                         } elsif ($sanitise_quote eq $c) {
1349                                 $sanitise_quote = '';
1350                         }
1351                 }
1352
1353                 #print "c<$c> SQ<$sanitise_quote>\n";
1354                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
1355                         substr($res, $off, 1, $;);
1356                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
1357                         substr($res, $off, 1, $;);
1358                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
1359                         substr($res, $off, 1, 'X');
1360                 } else {
1361                         substr($res, $off, 1, $c);
1362                 }
1363         }
1364
1365         if ($sanitise_quote eq '//') {
1366                 $sanitise_quote = '';
1367         }
1368
1369         # The pathname on a #include may be surrounded by '<' and '>'.
1370         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
1371                 my $clean = 'X' x length($1);
1372                 $res =~ s@\<.*\>@<$clean>@;
1373
1374         # The whole of a #error is a string.
1375         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
1376                 my $clean = 'X' x length($1);
1377                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
1378         }
1379
1380         if ($allow_c99_comments && $res =~ m@(//.*$)@) {
1381                 my $match = $1;
1382                 $res =~ s/\Q$match\E/"$;" x length($match)/e;
1383         }
1384
1385         return $res;
1386 }
1387
1388 sub get_quoted_string {
1389         my ($line, $rawline) = @_;
1390
1391         return "" if (!defined($line) || !defined($rawline));
1392         return "" if ($line !~ m/($String)/g);
1393         return substr($rawline, $-[0], $+[0] - $-[0]);
1394 }
1395
1396 sub ctx_statement_block {
1397         my ($linenr, $remain, $off) = @_;
1398         my $line = $linenr - 1;
1399         my $blk = '';
1400         my $soff = $off;
1401         my $coff = $off - 1;
1402         my $coff_set = 0;
1403
1404         my $loff = 0;
1405
1406         my $type = '';
1407         my $level = 0;
1408         my @stack = ();
1409         my $p;
1410         my $c;
1411         my $len = 0;
1412
1413         my $remainder;
1414         while (1) {
1415                 @stack = (['', 0]) if ($#stack == -1);
1416
1417                 #warn "CSB: blk<$blk> remain<$remain>\n";
1418                 # If we are about to drop off the end, pull in more
1419                 # context.
1420                 if ($off >= $len) {
1421                         for (; $remain > 0; $line++) {
1422                                 last if (!defined $lines[$line]);
1423                                 next if ($lines[$line] =~ /^-/);
1424                                 $remain--;
1425                                 $loff = $len;
1426                                 $blk .= $lines[$line] . "\n";
1427                                 $len = length($blk);
1428                                 $line++;
1429                                 last;
1430                         }
1431                         # Bail if there is no further context.
1432                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
1433                         if ($off >= $len) {
1434                                 last;
1435                         }
1436                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
1437                                 $level++;
1438                                 $type = '#';
1439                         }
1440                 }
1441                 $p = $c;
1442                 $c = substr($blk, $off, 1);
1443                 $remainder = substr($blk, $off);
1444
1445                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
1446
1447                 # Handle nested #if/#else.
1448                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
1449                         push(@stack, [ $type, $level ]);
1450                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
1451                         ($type, $level) = @{$stack[$#stack - 1]};
1452                 } elsif ($remainder =~ /^#\s*endif\b/) {
1453                         ($type, $level) = @{pop(@stack)};
1454                 }
1455
1456                 # Statement ends at the ';' or a close '}' at the
1457                 # outermost level.
1458                 if ($level == 0 && $c eq ';') {
1459                         last;
1460                 }
1461
1462                 # An else is really a conditional as long as its not else if
1463                 if ($level == 0 && $coff_set == 0 &&
1464                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
1465                                 $remainder =~ /^(else)(?:\s|{)/ &&
1466                                 $remainder !~ /^else\s+if\b/) {
1467                         $coff = $off + length($1) - 1;
1468                         $coff_set = 1;
1469                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
1470                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
1471                 }
1472
1473                 if (($type eq '' || $type eq '(') && $c eq '(') {
1474                         $level++;
1475                         $type = '(';
1476                 }
1477                 if ($type eq '(' && $c eq ')') {
1478                         $level--;
1479                         $type = ($level != 0)? '(' : '';
1480
1481                         if ($level == 0 && $coff < $soff) {
1482                                 $coff = $off;
1483                                 $coff_set = 1;
1484                                 #warn "CSB: mark coff<$coff>\n";
1485                         }
1486                 }
1487                 if (($type eq '' || $type eq '{') && $c eq '{') {
1488                         $level++;
1489                         $type = '{';
1490                 }
1491                 if ($type eq '{' && $c eq '}') {
1492                         $level--;
1493                         $type = ($level != 0)? '{' : '';
1494
1495                         if ($level == 0) {
1496                                 if (substr($blk, $off + 1, 1) eq ';') {
1497                                         $off++;
1498                                 }
1499                                 last;
1500                         }
1501                 }
1502                 # Preprocessor commands end at the newline unless escaped.
1503                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
1504                         $level--;
1505                         $type = '';
1506                         $off++;
1507                         last;
1508                 }
1509                 $off++;
1510         }
1511         # We are truly at the end, so shuffle to the next line.
1512         if ($off == $len) {
1513                 $loff = $len + 1;
1514                 $line++;
1515                 $remain--;
1516         }
1517
1518         my $statement = substr($blk, $soff, $off - $soff + 1);
1519         my $condition = substr($blk, $soff, $coff - $soff + 1);
1520
1521         #warn "STATEMENT<$statement>\n";
1522         #warn "CONDITION<$condition>\n";
1523
1524         #print "coff<$coff> soff<$off> loff<$loff>\n";
1525
1526         return ($statement, $condition,
1527                         $line, $remain + 1, $off - $loff + 1, $level);
1528 }
1529
1530 sub statement_lines {
1531         my ($stmt) = @_;
1532
1533         # Strip the diff line prefixes and rip blank lines at start and end.
1534         $stmt =~ s/(^|\n)./$1/g;
1535         $stmt =~ s/^\s*//;
1536         $stmt =~ s/\s*$//;
1537
1538         my @stmt_lines = ($stmt =~ /\n/g);
1539
1540         return $#stmt_lines + 2;
1541 }
1542
1543 sub statement_rawlines {
1544         my ($stmt) = @_;
1545
1546         my @stmt_lines = ($stmt =~ /\n/g);
1547
1548         return $#stmt_lines + 2;
1549 }
1550
1551 sub statement_block_size {
1552         my ($stmt) = @_;
1553
1554         $stmt =~ s/(^|\n)./$1/g;
1555         $stmt =~ s/^\s*{//;
1556         $stmt =~ s/}\s*$//;
1557         $stmt =~ s/^\s*//;
1558         $stmt =~ s/\s*$//;
1559
1560         my @stmt_lines = ($stmt =~ /\n/g);
1561         my @stmt_statements = ($stmt =~ /;/g);
1562
1563         my $stmt_lines = $#stmt_lines + 2;
1564         my $stmt_statements = $#stmt_statements + 1;
1565
1566         if ($stmt_lines > $stmt_statements) {
1567                 return $stmt_lines;
1568         } else {
1569                 return $stmt_statements;
1570         }
1571 }
1572
1573 sub ctx_statement_full {
1574         my ($linenr, $remain, $off) = @_;
1575         my ($statement, $condition, $level);
1576
1577         my (@chunks);
1578
1579         # Grab the first conditional/block pair.
1580         ($statement, $condition, $linenr, $remain, $off, $level) =
1581                                 ctx_statement_block($linenr, $remain, $off);
1582         #print "F: c<$condition> s<$statement> remain<$remain>\n";
1583         push(@chunks, [ $condition, $statement ]);
1584         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
1585                 return ($level, $linenr, @chunks);
1586         }
1587
1588         # Pull in the following conditional/block pairs and see if they
1589         # could continue the statement.
1590         for (;;) {
1591                 ($statement, $condition, $linenr, $remain, $off, $level) =
1592                                 ctx_statement_block($linenr, $remain, $off);
1593                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
1594                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
1595                 #print "C: push\n";
1596                 push(@chunks, [ $condition, $statement ]);
1597         }
1598
1599         return ($level, $linenr, @chunks);
1600 }
1601
1602 sub ctx_block_get {
1603         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
1604         my $line;
1605         my $start = $linenr - 1;
1606         my $blk = '';
1607         my @o;
1608         my @c;
1609         my @res = ();
1610
1611         my $level = 0;
1612         my @stack = ($level);
1613         for ($line = $start; $remain > 0; $line++) {
1614                 next if ($rawlines[$line] =~ /^-/);
1615                 $remain--;
1616
1617                 $blk .= $rawlines[$line];
1618
1619                 # Handle nested #if/#else.
1620                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
1621                         push(@stack, $level);
1622                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
1623                         $level = $stack[$#stack - 1];
1624                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
1625                         $level = pop(@stack);
1626                 }
1627
1628                 foreach my $c (split(//, $lines[$line])) {
1629                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
1630                         if ($off > 0) {
1631                                 $off--;
1632                                 next;
1633                         }
1634
1635                         if ($c eq $close && $level > 0) {
1636                                 $level--;
1637                                 last if ($level == 0);
1638                         } elsif ($c eq $open) {
1639                                 $level++;
1640                         }
1641                 }
1642
1643                 if (!$outer || $level <= 1) {
1644                         push(@res, $rawlines[$line]);
1645                 }
1646
1647                 last if ($level == 0);
1648         }
1649
1650         return ($level, @res);
1651 }
1652 sub ctx_block_outer {
1653         my ($linenr, $remain) = @_;
1654
1655         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
1656         return @r;
1657 }
1658 sub ctx_block {
1659         my ($linenr, $remain) = @_;
1660
1661         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1662         return @r;
1663 }
1664 sub ctx_statement {
1665         my ($linenr, $remain, $off) = @_;
1666
1667         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1668         return @r;
1669 }
1670 sub ctx_block_level {
1671         my ($linenr, $remain) = @_;
1672
1673         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1674 }
1675 sub ctx_statement_level {
1676         my ($linenr, $remain, $off) = @_;
1677
1678         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1679 }
1680
1681 sub ctx_locate_comment {
1682         my ($first_line, $end_line) = @_;
1683
1684         # Catch a comment on the end of the line itself.
1685         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
1686         return $current_comment if (defined $current_comment);
1687
1688         # Look through the context and try and figure out if there is a
1689         # comment.
1690         my $in_comment = 0;
1691         $current_comment = '';
1692         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
1693                 my $line = $rawlines[$linenr - 1];
1694                 #warn "           $line\n";
1695                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
1696                         $in_comment = 1;
1697                 }
1698                 if ($line =~ m@/\*@) {
1699                         $in_comment = 1;
1700                 }
1701                 if (!$in_comment && $current_comment ne '') {
1702                         $current_comment = '';
1703                 }
1704                 $current_comment .= $line . "\n" if ($in_comment);
1705                 if ($line =~ m@\*/@) {
1706                         $in_comment = 0;
1707                 }
1708         }
1709
1710         chomp($current_comment);
1711         return($current_comment);
1712 }
1713 sub ctx_has_comment {
1714         my ($first_line, $end_line) = @_;
1715         my $cmt = ctx_locate_comment($first_line, $end_line);
1716
1717         ##print "LINE: $rawlines[$end_line - 1 ]\n";
1718         ##print "CMMT: $cmt\n";
1719
1720         return ($cmt ne '');
1721 }
1722
1723 sub raw_line {
1724         my ($linenr, $cnt) = @_;
1725
1726         my $offset = $linenr - 1;
1727         $cnt++;
1728
1729         my $line;
1730         while ($cnt) {
1731                 $line = $rawlines[$offset++];
1732                 next if (defined($line) && $line =~ /^-/);
1733                 $cnt--;
1734         }
1735
1736         return $line;
1737 }
1738
1739 sub get_stat_real {
1740         my ($linenr, $lc) = @_;
1741
1742         my $stat_real = raw_line($linenr, 0);
1743         for (my $count = $linenr + 1; $count <= $lc; $count++) {
1744                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
1745         }
1746
1747         return $stat_real;
1748 }
1749
1750 sub get_stat_here {
1751         my ($linenr, $cnt, $here) = @_;
1752
1753         my $herectx = $here . "\n";
1754         for (my $n = 0; $n < $cnt; $n++) {
1755                 $herectx .= raw_line($linenr, $n) . "\n";
1756         }
1757
1758         return $herectx;
1759 }
1760
1761 sub cat_vet {
1762         my ($vet) = @_;
1763         my ($res, $coded);
1764
1765         $res = '';
1766         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
1767                 $res .= $1;
1768                 if ($2 ne '') {
1769                         $coded = sprintf("^%c", unpack('C', $2) + 64);
1770                         $res .= $coded;
1771                 }
1772         }
1773         $res =~ s/$/\$/;
1774
1775         return $res;
1776 }
1777
1778 my $av_preprocessor = 0;
1779 my $av_pending;
1780 my @av_paren_type;
1781 my $av_pend_colon;
1782
1783 sub annotate_reset {
1784         $av_preprocessor = 0;
1785         $av_pending = '_';
1786         @av_paren_type = ('E');
1787         $av_pend_colon = 'O';
1788 }
1789
1790 sub annotate_values {
1791         my ($stream, $type) = @_;
1792
1793         my $res;
1794         my $var = '_' x length($stream);
1795         my $cur = $stream;
1796
1797         print "$stream\n" if ($dbg_values > 1);
1798
1799         while (length($cur)) {
1800                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1801                 print " <" . join('', @av_paren_type) .
1802                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1803                 if ($cur =~ /^(\s+)/o) {
1804                         print "WS($1)\n" if ($dbg_values > 1);
1805                         if ($1 =~ /\n/ && $av_preprocessor) {
1806                                 $type = pop(@av_paren_type);
1807                                 $av_preprocessor = 0;
1808                         }
1809
1810                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1811                         print "CAST($1)\n" if ($dbg_values > 1);
1812                         push(@av_paren_type, $type);
1813                         $type = 'c';
1814
1815                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1816                         print "DECLARE($1)\n" if ($dbg_values > 1);
1817                         $type = 'T';
1818
1819                 } elsif ($cur =~ /^($Modifier)\s*/) {
1820                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1821                         $type = 'T';
1822
1823                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1824                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1825                         $av_preprocessor = 1;
1826                         push(@av_paren_type, $type);
1827                         if ($2 ne '') {
1828                                 $av_pending = 'N';
1829                         }
1830                         $type = 'E';
1831
1832                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1833                         print "UNDEF($1)\n" if ($dbg_values > 1);
1834                         $av_preprocessor = 1;
1835                         push(@av_paren_type, $type);
1836
1837                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1838                         print "PRE_START($1)\n" if ($dbg_values > 1);
1839                         $av_preprocessor = 1;
1840
1841                         push(@av_paren_type, $type);
1842                         push(@av_paren_type, $type);
1843                         $type = 'E';
1844
1845                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1846                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1847                         $av_preprocessor = 1;
1848
1849                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1850
1851                         $type = 'E';
1852
1853                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1854                         print "PRE_END($1)\n" if ($dbg_values > 1);
1855
1856                         $av_preprocessor = 1;
1857
1858                         # Assume all arms of the conditional end as this
1859                         # one does, and continue as if the #endif was not here.
1860                         pop(@av_paren_type);
1861                         push(@av_paren_type, $type);
1862                         $type = 'E';
1863
1864                 } elsif ($cur =~ /^(\\\n)/o) {
1865                         print "PRECONT($1)\n" if ($dbg_values > 1);
1866
1867                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1868                         print "ATTR($1)\n" if ($dbg_values > 1);
1869                         $av_pending = $type;
1870                         $type = 'N';
1871
1872                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1873                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1874                         if (defined $2) {
1875                                 $av_pending = 'V';
1876                         }
1877                         $type = 'N';
1878
1879                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1880                         print "COND($1)\n" if ($dbg_values > 1);
1881                         $av_pending = 'E';
1882                         $type = 'N';
1883
1884                 } elsif ($cur =~/^(case)/o) {
1885                         print "CASE($1)\n" if ($dbg_values > 1);
1886                         $av_pend_colon = 'C';
1887                         $type = 'N';
1888
1889                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1890                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1891                         $type = 'N';
1892
1893                 } elsif ($cur =~ /^(\()/o) {
1894                         print "PAREN('$1')\n" if ($dbg_values > 1);
1895                         push(@av_paren_type, $av_pending);
1896                         $av_pending = '_';
1897                         $type = 'N';
1898
1899                 } elsif ($cur =~ /^(\))/o) {
1900                         my $new_type = pop(@av_paren_type);
1901                         if ($new_type ne '_') {
1902                                 $type = $new_type;
1903                                 print "PAREN('$1') -> $type\n"
1904                                                         if ($dbg_values > 1);
1905                         } else {
1906                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1907                         }
1908
1909                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1910                         print "FUNC($1)\n" if ($dbg_values > 1);
1911                         $type = 'V';
1912                         $av_pending = 'V';
1913
1914                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1915                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1916                                 $av_pend_colon = 'B';
1917                         } elsif ($type eq 'E') {
1918                                 $av_pend_colon = 'L';
1919                         }
1920                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1921                         $type = 'V';
1922
1923                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1924                         print "IDENT($1)\n" if ($dbg_values > 1);
1925                         $type = 'V';
1926
1927                 } elsif ($cur =~ /^($Assignment)/o) {
1928                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1929                         $type = 'N';
1930
1931                 } elsif ($cur =~/^(;|{|})/) {
1932                         print "END($1)\n" if ($dbg_values > 1);
1933                         $type = 'E';
1934                         $av_pend_colon = 'O';
1935
1936                 } elsif ($cur =~/^(,)/) {
1937                         print "COMMA($1)\n" if ($dbg_values > 1);
1938                         $type = 'C';
1939
1940                 } elsif ($cur =~ /^(\?)/o) {
1941                         print "QUESTION($1)\n" if ($dbg_values > 1);
1942                         $type = 'N';
1943
1944                 } elsif ($cur =~ /^(:)/o) {
1945                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1946
1947                         substr($var, length($res), 1, $av_pend_colon);
1948                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1949                                 $type = 'E';
1950                         } else {
1951                                 $type = 'N';
1952                         }
1953                         $av_pend_colon = 'O';
1954
1955                 } elsif ($cur =~ /^(\[)/o) {
1956                         print "CLOSE($1)\n" if ($dbg_values > 1);
1957                         $type = 'N';
1958
1959                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1960                         my $variant;
1961
1962                         print "OPV($1)\n" if ($dbg_values > 1);
1963                         if ($type eq 'V') {
1964                                 $variant = 'B';
1965                         } else {
1966                                 $variant = 'U';
1967                         }
1968
1969                         substr($var, length($res), 1, $variant);
1970                         $type = 'N';
1971
1972                 } elsif ($cur =~ /^($Operators)/o) {
1973                         print "OP($1)\n" if ($dbg_values > 1);
1974                         if ($1 ne '++' && $1 ne '--') {
1975                                 $type = 'N';
1976                         }
1977
1978                 } elsif ($cur =~ /(^.)/o) {
1979                         print "C($1)\n" if ($dbg_values > 1);
1980                 }
1981                 if (defined $1) {
1982                         $cur = substr($cur, length($1));
1983                         $res .= $type x length($1);
1984                 }
1985         }
1986
1987         return ($res, $var);
1988 }
1989
1990 sub possible {
1991         my ($possible, $line) = @_;
1992         my $notPermitted = qr{(?:
1993                 ^(?:
1994                         $Modifier|
1995                         $Storage|
1996                         $Type|
1997                         DEFINE_\S+
1998                 )$|
1999                 ^(?:
2000                         goto|
2001                         return|
2002                         case|
2003                         else|
2004                         asm|__asm__|
2005                         do|
2006                         \#|
2007                         \#\#|
2008                 )(?:\s|$)|
2009                 ^(?:typedef|struct|enum)\b
2010             )}x;
2011         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
2012         if ($possible !~ $notPermitted) {
2013                 # Check for modifiers.
2014                 $possible =~ s/\s*$Storage\s*//g;
2015                 $possible =~ s/\s*$Sparse\s*//g;
2016                 if ($possible =~ /^\s*$/) {
2017
2018                 } elsif ($possible =~ /\s/) {
2019                         $possible =~ s/\s*$Type\s*//g;
2020                         for my $modifier (split(' ', $possible)) {
2021                                 if ($modifier !~ $notPermitted) {
2022                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
2023                                         push(@modifierListFile, $modifier);
2024                                 }
2025                         }
2026
2027                 } else {
2028                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
2029                         push(@typeListFile, $possible);
2030                 }
2031                 build_types();
2032         } else {
2033                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
2034         }
2035 }
2036
2037 my $prefix = '';
2038
2039 sub show_type {
2040         my ($type) = @_;
2041
2042         $type =~ tr/[a-z]/[A-Z]/;
2043
2044         return defined $use_type{$type} if (scalar keys %use_type > 0);
2045
2046         return !defined $ignore_type{$type};
2047 }
2048
2049 sub report {
2050         my ($level, $type, $msg) = @_;
2051
2052         if (!show_type($type) ||
2053             (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
2054                 return 0;
2055         }
2056         my $output = '';
2057         if ($color) {
2058                 if ($level eq 'ERROR') {
2059                         $output .= RED;
2060                 } elsif ($level eq 'WARNING') {
2061                         $output .= YELLOW;
2062                 } else {
2063                         $output .= GREEN;
2064                 }
2065         }
2066         $output .= $prefix . $level . ':';
2067         if ($show_types) {
2068                 $output .= BLUE if ($color);
2069                 $output .= "$type:";
2070         }
2071         $output .= RESET if ($color);
2072         $output .= ' ' . $msg . "\n";
2073
2074         if ($showfile) {
2075                 my @lines = split("\n", $output, -1);
2076                 splice(@lines, 1, 1);
2077                 $output = join("\n", @lines);
2078         }
2079         $output = (split('\n', $output))[0] . "\n" if ($terse);
2080
2081         push(our @report, $output);
2082
2083         return 1;
2084 }
2085
2086 sub report_dump {
2087         our @report;
2088 }
2089
2090 sub fixup_current_range {
2091         my ($lineRef, $offset, $length) = @_;
2092
2093         if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
2094                 my $o = $1;
2095                 my $l = $2;
2096                 my $no = $o + $offset;
2097                 my $nl = $l + $length;
2098                 $$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
2099         }
2100 }
2101
2102 sub fix_inserted_deleted_lines {
2103         my ($linesRef, $insertedRef, $deletedRef) = @_;
2104
2105         my $range_last_linenr = 0;
2106         my $delta_offset = 0;
2107
2108         my $old_linenr = 0;
2109         my $new_linenr = 0;
2110
2111         my $next_insert = 0;
2112         my $next_delete = 0;
2113
2114         my @lines = ();
2115
2116         my $inserted = @{$insertedRef}[$next_insert++];
2117         my $deleted = @{$deletedRef}[$next_delete++];
2118
2119         foreach my $old_line (@{$linesRef}) {
2120                 my $save_line = 1;
2121                 my $line = $old_line;   #don't modify the array
2122                 if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) {      #new filename
2123                         $delta_offset = 0;
2124                 } elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {    #new hunk
2125                         $range_last_linenr = $new_linenr;
2126                         fixup_current_range(\$line, $delta_offset, 0);
2127                 }
2128
2129                 while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
2130                         $deleted = @{$deletedRef}[$next_delete++];
2131                         $save_line = 0;
2132                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
2133                 }
2134
2135                 while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
2136                         push(@lines, ${$inserted}{'LINE'});
2137                         $inserted = @{$insertedRef}[$next_insert++];
2138                         $new_linenr++;
2139                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
2140                 }
2141
2142                 if ($save_line) {
2143                         push(@lines, $line);
2144                         $new_linenr++;
2145                 }
2146
2147                 $old_linenr++;
2148         }
2149
2150         return @lines;
2151 }
2152
2153 sub fix_insert_line {
2154         my ($linenr, $line) = @_;
2155
2156         my $inserted = {
2157                 LINENR => $linenr,
2158                 LINE => $line,
2159         };
2160         push(@fixed_inserted, $inserted);
2161 }
2162
2163 sub fix_delete_line {
2164         my ($linenr, $line) = @_;
2165
2166         my $deleted = {
2167                 LINENR => $linenr,
2168                 LINE => $line,
2169         };
2170
2171         push(@fixed_deleted, $deleted);
2172 }
2173
2174 sub ERROR {
2175         my ($type, $msg) = @_;
2176
2177         if (report("ERROR", $type, $msg)) {
2178                 our $clean = 0;
2179                 our $cnt_error++;
2180                 return 1;
2181         }
2182         return 0;
2183 }
2184 sub WARN {
2185         my ($type, $msg) = @_;
2186
2187         if (report("WARNING", $type, $msg)) {
2188                 our $clean = 0;
2189                 our $cnt_warn++;
2190                 return 1;
2191         }
2192         return 0;
2193 }
2194 sub CHK {
2195         my ($type, $msg) = @_;
2196
2197         if ($check && report("CHECK", $type, $msg)) {
2198                 our $clean = 0;
2199                 our $cnt_chk++;
2200                 return 1;
2201         }
2202         return 0;
2203 }
2204
2205 sub check_absolute_file {
2206         my ($absolute, $herecurr) = @_;
2207         my $file = $absolute;
2208
2209         ##print "absolute<$absolute>\n";
2210
2211         # See if any suffix of this path is a path within the tree.
2212         while ($file =~ s@^[^/]*/@@) {
2213                 if (-f "$root/$file") {
2214                         ##print "file<$file>\n";
2215                         last;
2216                 }
2217         }
2218         if (! -f _)  {
2219                 return 0;
2220         }
2221
2222         # It is, so see if the prefix is acceptable.
2223         my $prefix = $absolute;
2224         substr($prefix, -length($file)) = '';
2225
2226         ##print "prefix<$prefix>\n";
2227         if ($prefix ne ".../") {
2228                 WARN("USE_RELATIVE_PATH",
2229                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
2230         }
2231 }
2232
2233 sub trim {
2234         my ($string) = @_;
2235
2236         $string =~ s/^\s+|\s+$//g;
2237
2238         return $string;
2239 }
2240
2241 sub ltrim {
2242         my ($string) = @_;
2243
2244         $string =~ s/^\s+//;
2245
2246         return $string;
2247 }
2248
2249 sub rtrim {
2250         my ($string) = @_;
2251
2252         $string =~ s/\s+$//;
2253
2254         return $string;
2255 }
2256
2257 sub string_find_replace {
2258         my ($string, $find, $replace) = @_;
2259
2260         $string =~ s/$find/$replace/g;
2261
2262         return $string;
2263 }
2264
2265 sub tabify {
2266         my ($leading) = @_;
2267
2268         my $source_indent = $tabsize;
2269         my $max_spaces_before_tab = $source_indent - 1;
2270         my $spaces_to_tab = " " x $source_indent;
2271
2272         #convert leading spaces to tabs
2273         1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
2274         #Remove spaces before a tab
2275         1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;
2276
2277         return "$leading";
2278 }
2279
2280 sub pos_last_openparen {
2281         my ($line) = @_;
2282
2283         my $pos = 0;
2284
2285         my $opens = $line =~ tr/\(/\(/;
2286         my $closes = $line =~ tr/\)/\)/;
2287
2288         my $last_openparen = 0;
2289
2290         if (($opens == 0) || ($closes >= $opens)) {
2291                 return -1;
2292         }
2293
2294         my $len = length($line);
2295
2296         for ($pos = 0; $pos < $len; $pos++) {
2297                 my $string = substr($line, $pos);
2298                 if ($string =~ /^($FuncArg|$balanced_parens)/) {
2299                         $pos += length($1) - 1;
2300                 } elsif (substr($line, $pos, 1) eq '(') {
2301                         $last_openparen = $pos;
2302                 } elsif (index($string, '(') == -1) {
2303                         last;
2304                 }
2305         }
2306
2307         return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
2308 }
2309
2310 sub get_raw_comment {
2311         my ($line, $rawline) = @_;
2312         my $comment = '';
2313
2314         for my $i (0 .. (length($line) - 1)) {
2315                 if (substr($line, $i, 1) eq "$;") {
2316                         $comment .= substr($rawline, $i, 1);
2317                 }
2318         }
2319
2320         return $comment;
2321 }
2322
2323 # Args:
2324 #   line: Patch line to check
2325 #   auto: Auto variable name, e.g. "per_child_auto"
2326 #   suffix: Suffix to expect on member, e.g. "_priv"
2327 #   warning: Warning name, e.g. "PRIV_AUTO"
2328 sub u_boot_struct_name {
2329         my ($line, $auto, $suffix, $warning) = @_;
2330
2331         # Use _priv as a suffix for the device-private data struct
2332         if ($line =~ /^\+\s*\.${auto}\s*=\s*sizeof\(struct\((\w+)\).*/) {
2333                 my $struct_name = $1;
2334                 if ($struct_name !~ /^\w+${suffix}/) {
2335                         WARN($warning, "struct \'$struct_name\' should have a ${suffix} suffix");
2336                 }
2337         }
2338 }
2339
2340 # Checks specific to U-Boot
2341 sub u_boot_line {
2342         my ($realfile, $line, $rawline, $herecurr) = @_;
2343
2344         # ask for a test if a new uclass ID is added
2345         if ($realfile =~ /uclass-id.h/ && $line =~ /^\+/) {
2346                 WARN("NEW_UCLASS",
2347                      "Possible new uclass - make sure to add a sandbox driver, plus a test in test/dm/<name>.c\n" . $herecurr);
2348         }
2349
2350         # try to get people to use the livetree API
2351         if ($line =~ /^\+.*fdtdec_/) {
2352                 WARN("LIVETREE",
2353                      "Use the livetree API (dev_read_...)\n" . $herecurr);
2354         }
2355
2356         # add tests for new commands
2357         if ($line =~ /^\+.*do_($Ident)\(struct cmd_tbl.*/) {
2358                 WARN("CMD_TEST",
2359                      "Possible new command - make sure you add a test\n" . $herecurr);
2360         }
2361
2362         # use if instead of #if
2363         if ($realfile =~ /\.c$/ && $line =~ /^\+#if.*CONFIG.*/) {
2364                 WARN("PREFER_IF",
2365                      "Use 'if (IS_ENABLED(CONFIG...))' instead of '#if or #ifdef' where possible\n" . $herecurr);
2366         }
2367
2368         # use defconfig to manage CONFIG_CMD options
2369         if ($line =~ /\+\s*#\s*(define|undef)\s+(CONFIG_CMD\w*)\b/) {
2370                 ERROR("DEFINE_CONFIG_CMD",
2371                       "All commands are managed by Kconfig\n" . $herecurr);
2372         }
2373
2374         # Don't put common.h and dm.h in header files
2375         if ($realfile =~ /\.h$/ && $rawline =~ /^\+#include\s*<(common|dm)\.h>*/) {
2376                 ERROR("BARRED_INCLUDE_IN_HDR",
2377                       "Avoid including common.h and dm.h in header files\n" . $herecurr);
2378         }
2379
2380         # Do not disable fdt / initrd relocation
2381         if ($rawline =~ /.*(fdt|initrd)_high=0xffffffff/) {
2382                 ERROR("DISABLE_FDT_OR_INITRD_RELOC",
2383                      "fdt or initrd relocation disabled at boot time\n" . $herecurr);
2384         }
2385
2386         # Do not use CONFIG_ prefix in CONFIG_IS_ENABLED() calls
2387         if ($line =~ /^\+.*CONFIG_IS_ENABLED\(CONFIG_\w*\).*/) {
2388                 ERROR("CONFIG_IS_ENABLED_CONFIG",
2389                       "CONFIG_IS_ENABLED() takes values without the CONFIG_ prefix\n" . $herecurr);
2390         }
2391
2392         # Use _priv as a suffix for the device-private data struct
2393         if ($line =~ /^\+\s*\.priv_auto\s*=\s*sizeof\(struct\((\w+)\).*/) {
2394                 my $struct_name = $1;
2395                 if ($struct_name !~ /^\w+_priv/) {
2396                         WARN("PRIV_AUTO", "struct \'$struct_name\' should have a _priv suffix");
2397                 }
2398         }
2399
2400         # Check struct names for the 'auto' members of struct driver
2401         u_boot_struct_name($line, "priv_auto", "_priv", "PRIV_AUTO");
2402         u_boot_struct_name($line, "plat_auto", "_plat", "PLAT_AUTO");
2403         u_boot_struct_name($line, "per_child_auto", "_priv", "CHILD_PRIV_AUTO");
2404         u_boot_struct_name($line, "per_child_plat_auto", "_plat",
2405                 "CHILD_PLAT_AUTO");
2406
2407         # Now the ones for struct uclass, skipping those in common with above
2408         u_boot_struct_name($line, "per_device_auto", "_priv",
2409                 "DEVICE_PRIV_AUTO");
2410         u_boot_struct_name($line, "per_device_plat_auto", "_plat",
2411                 "DEVICE_PLAT_AUTO");
2412 }
2413
2414 sub process {
2415         my $filename = shift;
2416
2417         my $linenr=0;
2418         my $prevline="";
2419         my $prevrawline="";
2420         my $stashline="";
2421         my $stashrawline="";
2422
2423         my $length;
2424         my $indent;
2425         my $previndent=0;
2426         my $stashindent=0;
2427
2428         our $clean = 1;
2429         my $signoff = 0;
2430         my $author = '';
2431         my $authorsignoff = 0;
2432         my $is_patch = 0;
2433         my $is_binding_patch = -1;
2434         my $in_header_lines = $file ? 0 : 1;
2435         my $in_commit_log = 0;          #Scanning lines before patch
2436         my $has_patch_separator = 0;    #Found a --- line
2437         my $has_commit_log = 0;         #Encountered lines before patch
2438         my $commit_log_lines = 0;       #Number of commit log lines
2439         my $commit_log_possible_stack_dump = 0;
2440         my $commit_log_long_line = 0;
2441         my $commit_log_has_diff = 0;
2442         my $reported_maintainer_file = 0;
2443         my $non_utf8_charset = 0;
2444
2445         my $last_blank_line = 0;
2446         my $last_coalesced_string_linenr = -1;
2447
2448         our @report = ();
2449         our $cnt_lines = 0;
2450         our $cnt_error = 0;
2451         our $cnt_warn = 0;
2452         our $cnt_chk = 0;
2453
2454         # Trace the real file/line as we go.
2455         my $realfile = '';
2456         my $realline = 0;
2457         my $realcnt = 0;
2458         my $here = '';
2459         my $context_function;           #undef'd unless there's a known function
2460         my $in_comment = 0;
2461         my $comment_edge = 0;
2462         my $first_line = 0;
2463         my $p1_prefix = '';
2464
2465         my $prev_values = 'E';
2466
2467         # suppression flags
2468         my %suppress_ifbraces;
2469         my %suppress_whiletrailers;
2470         my %suppress_export;
2471         my $suppress_statement = 0;
2472
2473         my %signatures = ();
2474
2475         # Pre-scan the patch sanitizing the lines.
2476         # Pre-scan the patch looking for any __setup documentation.
2477         #
2478         my @setup_docs = ();
2479         my $setup_docs = 0;
2480
2481         my $camelcase_file_seeded = 0;
2482
2483         my $checklicenseline = 1;
2484
2485         sanitise_line_reset();
2486         my $line;
2487         foreach my $rawline (@rawlines) {
2488                 $linenr++;
2489                 $line = $rawline;
2490
2491                 push(@fixed, $rawline) if ($fix);
2492
2493                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
2494                         $setup_docs = 0;
2495                         if ($1 =~ m@Documentation/admin-guide/kernel-parameters.rst$@) {
2496                                 $setup_docs = 1;
2497                         }
2498                         #next;
2499                 }
2500                 if ($rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
2501                         $realline=$1-1;
2502                         if (defined $2) {
2503                                 $realcnt=$3+1;
2504                         } else {
2505                                 $realcnt=1+1;
2506                         }
2507                         $in_comment = 0;
2508
2509                         # Guestimate if this is a continuing comment.  Run
2510                         # the context looking for a comment "edge".  If this
2511                         # edge is a close comment then we must be in a comment
2512                         # at context start.
2513                         my $edge;
2514                         my $cnt = $realcnt;
2515                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
2516                                 next if (defined $rawlines[$ln - 1] &&
2517                                          $rawlines[$ln - 1] =~ /^-/);
2518                                 $cnt--;
2519                                 #print "RAW<$rawlines[$ln - 1]>\n";
2520                                 last if (!defined $rawlines[$ln - 1]);
2521                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
2522                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
2523                                         ($edge) = $1;
2524                                         last;
2525                                 }
2526                         }
2527                         if (defined $edge && $edge eq '*/') {
2528                                 $in_comment = 1;
2529                         }
2530
2531                         # Guestimate if this is a continuing comment.  If this
2532                         # is the start of a diff block and this line starts
2533                         # ' *' then it is very likely a comment.
2534                         if (!defined $edge &&
2535                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
2536                         {
2537                                 $in_comment = 1;
2538                         }
2539
2540                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
2541                         sanitise_line_reset($in_comment);
2542
2543                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
2544                         # Standardise the strings and chars within the input to
2545                         # simplify matching -- only bother with positive lines.
2546                         $line = sanitise_line($rawline);
2547                 }
2548                 push(@lines, $line);
2549
2550                 if ($realcnt > 1) {
2551                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
2552                 } else {
2553                         $realcnt = 0;
2554                 }
2555
2556                 #print "==>$rawline\n";
2557                 #print "-->$line\n";
2558
2559                 if ($setup_docs && $line =~ /^\+/) {
2560                         push(@setup_docs, $line);
2561                 }
2562         }
2563
2564         $prefix = '';
2565
2566         $realcnt = 0;
2567         $linenr = 0;
2568         $fixlinenr = -1;
2569         foreach my $line (@lines) {
2570                 $linenr++;
2571                 $fixlinenr++;
2572                 my $sline = $line;      #copy of $line
2573                 $sline =~ s/$;/ /g;     #with comments as spaces
2574
2575                 my $rawline = $rawlines[$linenr - 1];
2576                 my $raw_comment = get_raw_comment($line, $rawline);
2577
2578 # check if it's a mode change, rename or start of a patch
2579                 if (!$in_commit_log &&
2580                     ($line =~ /^ mode change [0-7]+ => [0-7]+ \S+\s*$/ ||
2581                     ($line =~ /^rename (?:from|to) \S+\s*$/ ||
2582                      $line =~ /^diff --git a\/[\w\/\.\_\-]+ b\/\S+\s*$/))) {
2583                         $is_patch = 1;
2584                 }
2585
2586 #extract the line range in the file after the patch is applied
2587                 if (!$in_commit_log &&
2588                     $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
2589                         my $context = $4;
2590                         $is_patch = 1;
2591                         $first_line = $linenr + 1;
2592                         $realline=$1-1;
2593                         if (defined $2) {
2594                                 $realcnt=$3+1;
2595                         } else {
2596                                 $realcnt=1+1;
2597                         }
2598                         annotate_reset();
2599                         $prev_values = 'E';
2600
2601                         %suppress_ifbraces = ();
2602                         %suppress_whiletrailers = ();
2603                         %suppress_export = ();
2604                         $suppress_statement = 0;
2605                         if ($context =~ /\b(\w+)\s*\(/) {
2606                                 $context_function = $1;
2607                         } else {
2608                                 undef $context_function;
2609                         }
2610                         next;
2611
2612 # track the line number as we move through the hunk, note that
2613 # new versions of GNU diff omit the leading space on completely
2614 # blank context lines so we need to count that too.
2615                 } elsif ($line =~ /^( |\+|$)/) {
2616                         $realline++;
2617                         $realcnt-- if ($realcnt != 0);
2618
2619                         # Measure the line length and indent.
2620                         ($length, $indent) = line_stats($rawline);
2621
2622                         # Track the previous line.
2623                         ($prevline, $stashline) = ($stashline, $line);
2624                         ($previndent, $stashindent) = ($stashindent, $indent);
2625                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
2626
2627                         #warn "line<$line>\n";
2628
2629                 } elsif ($realcnt == 1) {
2630                         $realcnt--;
2631                 }
2632
2633                 my $hunk_line = ($realcnt != 0);
2634
2635                 $here = "#$linenr: " if (!$file);
2636                 $here = "#$realline: " if ($file);
2637
2638                 my $found_file = 0;
2639                 # extract the filename as it passes
2640                 if ($line =~ /^diff --git.*?(\S+)$/) {
2641                         $realfile = $1;
2642                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2643                         $in_commit_log = 0;
2644                         $found_file = 1;
2645                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
2646                         $realfile = $1;
2647                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2648                         $in_commit_log = 0;
2649
2650                         $p1_prefix = $1;
2651                         if (!$file && $tree && $p1_prefix ne '' &&
2652                             -e "$root/$p1_prefix") {
2653                                 WARN("PATCH_PREFIX",
2654                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
2655                         }
2656
2657                         if ($realfile =~ m@^include/asm/@) {
2658                                 ERROR("MODIFIED_INCLUDE_ASM",
2659                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
2660                         }
2661                         $found_file = 1;
2662                 }
2663
2664 #make up the handle for any error we report on this line
2665                 if ($showfile) {
2666                         $prefix = "$realfile:$realline: "
2667                 } elsif ($emacs) {
2668                         if ($file) {
2669                                 $prefix = "$filename:$realline: ";
2670                         } else {
2671                                 $prefix = "$filename:$linenr: ";
2672                         }
2673                 }
2674
2675                 if ($found_file) {
2676                         if (is_maintained_obsolete($realfile)) {
2677                                 WARN("OBSOLETE",
2678                                      "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy.  No unnecessary modifications please.\n");
2679                         }
2680                         if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) {
2681                                 $check = 1;
2682                         } else {
2683                                 $check = $check_orig;
2684                         }
2685                         $checklicenseline = 1;
2686
2687                         if ($realfile !~ /^MAINTAINERS/) {
2688                                 my $last_binding_patch = $is_binding_patch;
2689
2690                                 $is_binding_patch = () = $realfile =~ m@^(?:Documentation/devicetree/|include/dt-bindings/)@;
2691
2692                                 if (($last_binding_patch != -1) &&
2693                                     ($last_binding_patch ^ $is_binding_patch)) {
2694                                         WARN("DT_SPLIT_BINDING_PATCH",
2695                                              "DT binding docs and includes should be a separate patch. See: Documentation/devicetree/bindings/submitting-patches.txt\n");
2696                                 }
2697                         }
2698
2699                         next;
2700                 }
2701
2702                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
2703
2704                 my $hereline = "$here\n$rawline\n";
2705                 my $herecurr = "$here\n$rawline\n";
2706                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
2707
2708                 $cnt_lines++ if ($realcnt != 0);
2709
2710 # Verify the existence of a commit log if appropriate
2711 # 2 is used because a $signature is counted in $commit_log_lines
2712                 if ($in_commit_log) {
2713                         if ($line !~ /^\s*$/) {
2714                                 $commit_log_lines++;    #could be a $signature
2715                         }
2716                 } elsif ($has_commit_log && $commit_log_lines < 2) {
2717                         WARN("COMMIT_MESSAGE",
2718                              "Missing commit description - Add an appropriate one\n");
2719                         $commit_log_lines = 2;  #warn only once
2720                 }
2721
2722 # Check if the commit log has what seems like a diff which can confuse patch
2723                 if ($in_commit_log && !$commit_log_has_diff &&
2724                     (($line =~ m@^\s+diff\b.*a/[\w/]+@ &&
2725                       $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) ||
2726                      $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ ||
2727                      $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) {
2728                         ERROR("DIFF_IN_COMMIT_MSG",
2729                               "Avoid using diff content in the commit message - patch(1) might not work\n" . $herecurr);
2730                         $commit_log_has_diff = 1;
2731                 }
2732
2733 # Check for incorrect file permissions
2734                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
2735                         my $permhere = $here . "FILE: $realfile\n";
2736                         if ($realfile !~ m@scripts/@ &&
2737                             $realfile !~ /\.(py|pl|awk|sh)$/) {
2738                                 ERROR("EXECUTE_PERMISSIONS",
2739                                       "do not set execute permissions for source files\n" . $permhere);
2740                         }
2741                 }
2742
2743 # Check the patch for a From:
2744                 if (decode("MIME-Header", $line) =~ /^From:\s*(.*)/) {
2745                         $author = $1;
2746                         $author = encode("utf8", $author) if ($line =~ /=\?utf-8\?/i);
2747                         $author =~ s/"//g;
2748                         $author = reformat_email($author);
2749                 }
2750
2751 # Check the patch for a signoff:
2752                 if ($line =~ /^\s*signed-off-by:\s*(.*)/i) {
2753                         $signoff++;
2754                         $in_commit_log = 0;
2755                         if ($author ne '') {
2756                                 if (same_email_addresses($1, $author)) {
2757                                         $authorsignoff = 1;
2758                                 }
2759                         }
2760                 }
2761
2762 # Check for patch separator
2763                 if ($line =~ /^---$/) {
2764                         $has_patch_separator = 1;
2765                         $in_commit_log = 0;
2766                 }
2767
2768 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
2769 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
2770                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
2771                         $reported_maintainer_file = 1;
2772                 }
2773
2774 # Check signature styles
2775                 if (!$in_header_lines &&
2776                     $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
2777                         my $space_before = $1;
2778                         my $sign_off = $2;
2779                         my $space_after = $3;
2780                         my $email = $4;
2781                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
2782
2783                         if ($sign_off !~ /$signature_tags/) {
2784                                 WARN("BAD_SIGN_OFF",
2785                                      "Non-standard signature: $sign_off\n" . $herecurr);
2786                         }
2787                         if (defined $space_before && $space_before ne "") {
2788                                 if (WARN("BAD_SIGN_OFF",
2789                                          "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
2790                                     $fix) {
2791                                         $fixed[$fixlinenr] =
2792                                             "$ucfirst_sign_off $email";
2793                                 }
2794                         }
2795                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
2796                                 if (WARN("BAD_SIGN_OFF",
2797                                          "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
2798                                     $fix) {
2799                                         $fixed[$fixlinenr] =
2800                                             "$ucfirst_sign_off $email";
2801                                 }
2802
2803                         }
2804                         if (!defined $space_after || $space_after ne " ") {
2805                                 if (WARN("BAD_SIGN_OFF",
2806                                          "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
2807                                     $fix) {
2808                                         $fixed[$fixlinenr] =
2809                                             "$ucfirst_sign_off $email";
2810                                 }
2811                         }
2812
2813                         my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
2814                         my $suggested_email = format_email(($email_name, $email_address));
2815                         if ($suggested_email eq "") {
2816                                 ERROR("BAD_SIGN_OFF",
2817                                       "Unrecognized email address: '$email'\n" . $herecurr);
2818                         } else {
2819                                 my $dequoted = $suggested_email;
2820                                 $dequoted =~ s/^"//;
2821                                 $dequoted =~ s/" </ </;
2822                                 # Don't force email to have quotes
2823                                 # Allow just an angle bracketed address
2824                                 if (!same_email_addresses($email, $suggested_email)) {
2825                                         WARN("BAD_SIGN_OFF",
2826                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
2827                                 }
2828                         }
2829
2830 # Check for duplicate signatures
2831                         my $sig_nospace = $line;
2832                         $sig_nospace =~ s/\s//g;
2833                         $sig_nospace = lc($sig_nospace);
2834                         if (defined $signatures{$sig_nospace}) {
2835                                 WARN("BAD_SIGN_OFF",
2836                                      "Duplicate signature\n" . $herecurr);
2837                         } else {
2838                                 $signatures{$sig_nospace} = 1;
2839                         }
2840
2841 # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
2842                         if ($sign_off =~ /^co-developed-by:$/i) {
2843                                 if ($email eq $author) {
2844                                         WARN("BAD_SIGN_OFF",
2845                                               "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
2846                                 }
2847                                 if (!defined $lines[$linenr]) {
2848                                         WARN("BAD_SIGN_OFF",
2849                                              "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline);
2850                                 } elsif ($rawlines[$linenr] !~ /^\s*signed-off-by:\s*(.*)/i) {
2851                                         WARN("BAD_SIGN_OFF",
2852                                              "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
2853                                 } elsif ($1 ne $email) {
2854                                         WARN("BAD_SIGN_OFF",
2855                                              "Co-developed-by and Signed-off-by: name/email do not match \n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
2856                                 }
2857                         }
2858                 }
2859
2860 # Check email subject for common tools that don't need to be mentioned
2861                 if ($in_header_lines &&
2862                     $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
2863                         WARN("EMAIL_SUBJECT",
2864                              "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
2865                 }
2866
2867 # Check for Gerrit Change-Ids not in any patch context
2868                 if ($realfile eq '' && !$has_patch_separator && $line =~ /^\s*change-id:/i) {
2869                         ERROR("GERRIT_CHANGE_ID",
2870                               "Remove Gerrit Change-Id's before submitting upstream\n" . $herecurr);
2871                 }
2872
2873 # Check if the commit log is in a possible stack dump
2874                 if ($in_commit_log && !$commit_log_possible_stack_dump &&
2875                     ($line =~ /^\s*(?:WARNING:|BUG:)/ ||
2876                      $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ ||
2877                                         # timestamp
2878                      $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/) ||
2879                      $line =~ /^(?:\s+\w+:\s+[0-9a-fA-F]+){3,3}/ ||
2880                      $line =~ /^\s*\#\d+\s*\[[0-9a-fA-F]+\]\s*\w+ at [0-9a-fA-F]+/) {
2881                                         # stack dump address styles
2882                         $commit_log_possible_stack_dump = 1;
2883                 }
2884
2885 # Check for line lengths > 75 in commit log, warn once
2886                 if ($in_commit_log && !$commit_log_long_line &&
2887                     length($line) > 75 &&
2888                     !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
2889                                         # file delta changes
2890                       $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
2891                                         # filename then :
2892                       $line =~ /^\s*(?:Fixes:|Link:)/i ||
2893                                         # A Fixes: or Link: line
2894                       $commit_log_possible_stack_dump)) {
2895                         WARN("COMMIT_LOG_LONG_LINE",
2896                              "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
2897                         $commit_log_long_line = 1;
2898                 }
2899
2900 # Reset possible stack dump if a blank line is found
2901                 if ($in_commit_log && $commit_log_possible_stack_dump &&
2902                     $line =~ /^\s*$/) {
2903                         $commit_log_possible_stack_dump = 0;
2904                 }
2905
2906 # Check for git id commit length and improperly formed commit descriptions
2907                 if ($in_commit_log && !$commit_log_possible_stack_dump &&
2908                     $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink|base-commit):/i &&
2909                     $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
2910                     ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
2911                      ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
2912                       $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
2913                       $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
2914                         my $init_char = "c";
2915                         my $orig_commit = "";
2916                         my $short = 1;
2917                         my $long = 0;
2918                         my $case = 1;
2919                         my $space = 1;
2920                         my $hasdesc = 0;
2921                         my $hasparens = 0;
2922                         my $id = '0123456789ab';
2923                         my $orig_desc = "commit description";
2924                         my $description = "";
2925
2926                         if ($line =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) {
2927                                 $init_char = $1;
2928                                 $orig_commit = lc($2);
2929                         } elsif ($line =~ /\b([0-9a-f]{12,40})\b/i) {
2930                                 $orig_commit = lc($1);
2931                         }
2932
2933                         $short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
2934                         $long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
2935                         $space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
2936                         $case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
2937                         if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
2938                                 $orig_desc = $1;
2939                                 $hasparens = 1;
2940                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
2941                                  defined $rawlines[$linenr] &&
2942                                  $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
2943                                 $orig_desc = $1;
2944                                 $hasparens = 1;
2945                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
2946                                  defined $rawlines[$linenr] &&
2947                                  $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
2948                                 $line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
2949                                 $orig_desc = $1;
2950                                 $rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
2951                                 $orig_desc .= " " . $1;
2952                                 $hasparens = 1;
2953                         }
2954
2955                         ($id, $description) = git_commit_info($orig_commit,
2956                                                               $id, $orig_desc);
2957
2958                         if (defined($id) &&
2959                            ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens)) {
2960                                 ERROR("GIT_COMMIT_ID",
2961                                       "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr);
2962                         }
2963                 }
2964
2965 # Check for added, moved or deleted files
2966                 if (!$reported_maintainer_file && !$in_commit_log &&
2967                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
2968                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
2969                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
2970                       (defined($1) || defined($2))))) {
2971                         $is_patch = 1;
2972                         $reported_maintainer_file = 1;
2973                         WARN("FILE_PATH_CHANGES",
2974                              "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
2975                 }
2976
2977 # Check for adding new DT bindings not in schema format
2978                 if (!$in_commit_log &&
2979                     ($line =~ /^new file mode\s*\d+\s*$/) &&
2980                     ($realfile =~ m@^Documentation/devicetree/bindings/.*\.txt$@)) {
2981                         WARN("DT_SCHEMA_BINDING_PATCH",
2982                              "DT bindings should be in DT schema format. See: Documentation/devicetree/writing-schema.rst\n");
2983                 }
2984
2985 # Check for wrappage within a valid hunk of the file
2986                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
2987                         ERROR("CORRUPTED_PATCH",
2988                               "patch seems to be corrupt (line wrapped?)\n" .
2989                                 $herecurr) if (!$emitted_corrupt++);
2990                 }
2991
2992 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
2993                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
2994                     $rawline !~ m/^$UTF8*$/) {
2995                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
2996
2997                         my $blank = copy_spacing($rawline);
2998                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
2999                         my $hereptr = "$hereline$ptr\n";
3000
3001                         CHK("INVALID_UTF8",
3002                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
3003                 }
3004
3005 # Check if it's the start of a commit log
3006 # (not a header line and we haven't seen the patch filename)
3007                 if ($in_header_lines && $realfile =~ /^$/ &&
3008                     !($rawline =~ /^\s+(?:\S|$)/ ||
3009                       $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) {
3010                         $in_header_lines = 0;
3011                         $in_commit_log = 1;
3012                         $has_commit_log = 1;
3013                 }
3014
3015 # Check if there is UTF-8 in a commit log when a mail header has explicitly
3016 # declined it, i.e defined some charset where it is missing.
3017                 if ($in_header_lines &&
3018                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
3019                     $1 !~ /utf-8/i) {
3020                         $non_utf8_charset = 1;
3021                 }
3022
3023                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
3024                     $rawline =~ /$NON_ASCII_UTF8/) {
3025                         WARN("UTF8_BEFORE_PATCH",
3026                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
3027                 }
3028
3029 # Check for absolute kernel paths in commit message
3030                 if ($tree && $in_commit_log) {
3031                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
3032                                 my $file = $1;
3033
3034                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
3035                                     check_absolute_file($1, $herecurr)) {
3036                                         #
3037                                 } else {
3038                                         check_absolute_file($file, $herecurr);
3039                                 }
3040                         }
3041                 }
3042
3043 # Check for various typo / spelling mistakes
3044                 if (defined($misspellings) &&
3045                     ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
3046                         while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:\b|$|[^a-z@])/gi) {
3047                                 my $typo = $1;
3048                                 my $typo_fix = $spelling_fix{lc($typo)};
3049                                 $typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
3050                                 $typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
3051                                 my $msg_level = \&WARN;
3052                                 $msg_level = \&CHK if ($file);
3053                                 if (&{$msg_level}("TYPO_SPELLING",
3054                                                   "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $herecurr) &&
3055                                     $fix) {
3056                                         $fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
3057                                 }
3058                         }
3059                 }
3060
3061 # check for invalid commit id
3062                 if ($in_commit_log && $line =~ /(^fixes:|\bcommit)\s+([0-9a-f]{6,40})\b/i) {
3063                         my $id;
3064                         my $description;
3065                         ($id, $description) = git_commit_info($2, undef, undef);
3066                         if (!defined($id)) {
3067                                 WARN("UNKNOWN_COMMIT_ID",
3068                                      "Unknown commit id '$2', maybe rebased or not pulled?\n" . $herecurr);
3069                         }
3070                 }
3071
3072 # ignore non-hunk lines and lines being removed
3073                 next if (!$hunk_line || $line =~ /^-/);
3074
3075 #trailing whitespace
3076                 if ($line =~ /^\+.*\015/) {
3077                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3078                         if (ERROR("DOS_LINE_ENDINGS",
3079                                   "DOS line endings\n" . $herevet) &&
3080                             $fix) {
3081                                 $fixed[$fixlinenr] =~ s/[\s\015]+$//;
3082                         }
3083                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
3084                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3085                         if (ERROR("TRAILING_WHITESPACE",
3086                                   "trailing whitespace\n" . $herevet) &&
3087                             $fix) {
3088                                 $fixed[$fixlinenr] =~ s/\s+$//;
3089                         }
3090
3091                         $rpt_cleaners = 1;
3092                 }
3093
3094 # Check for FSF mailing addresses.
3095                 if ($rawline =~ /\bwrite to the Free/i ||
3096                     $rawline =~ /\b675\s+Mass\s+Ave/i ||
3097                     $rawline =~ /\b59\s+Temple\s+Pl/i ||
3098                     $rawline =~ /\b51\s+Franklin\s+St/i) {
3099                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3100                         my $msg_level = \&ERROR;
3101                         $msg_level = \&CHK if ($file);
3102                         &{$msg_level}("FSF_MAILING_ADDRESS",
3103                                       "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.\n" . $herevet)
3104                 }
3105
3106 # check for Kconfig help text having a real description
3107 # Only applies when adding the entry originally, after that we do not have
3108 # sufficient context to determine whether it is indeed long enough.
3109                 if ($realfile =~ /Kconfig/ &&
3110                     # 'choice' is usually the last thing on the line (though
3111                     # Kconfig supports named choices), so use a word boundary
3112                     # (\b) rather than a whitespace character (\s)
3113                     $line =~ /^\+\s*(?:config|menuconfig|choice)\b/) {
3114                         my $length = 0;
3115                         my $cnt = $realcnt;
3116                         my $ln = $linenr + 1;
3117                         my $f;
3118                         my $is_start = 0;
3119                         my $is_end = 0;
3120                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
3121                                 $f = $lines[$ln - 1];
3122                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
3123                                 $is_end = $lines[$ln - 1] =~ /^\+/;
3124
3125                                 next if ($f =~ /^-/);
3126                                 last if (!$file && $f =~ /^\@\@/);
3127
3128                                 if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate|prompt)\s*["']/) {
3129                                         $is_start = 1;
3130                                 } elsif ($lines[$ln - 1] =~ /^\+\s*(?:help|---help---)\s*$/) {
3131                                         if ($lines[$ln - 1] =~ "---help---") {
3132                                                 WARN("CONFIG_DESCRIPTION",
3133                                                      "prefer 'help' over '---help---' for new help texts\n" . $herecurr);
3134                                         }
3135                                         $length = -1;
3136                                 }
3137
3138                                 $f =~ s/^.//;
3139                                 $f =~ s/#.*//;
3140                                 $f =~ s/^\s+//;
3141                                 next if ($f =~ /^$/);
3142
3143                                 # This only checks context lines in the patch
3144                                 # and so hopefully shouldn't trigger false
3145                                 # positives, even though some of these are
3146                                 # common words in help texts
3147                                 if ($f =~ /^\s*(?:config|menuconfig|choice|endchoice|
3148                                                   if|endif|menu|endmenu|source)\b/x) {
3149                                         $is_end = 1;
3150                                         last;
3151                                 }
3152                                 $length++;
3153                         }
3154                         if ($is_start && $is_end && $length < $min_conf_desc_length) {
3155                                 WARN("CONFIG_DESCRIPTION",
3156                                      "please write a paragraph that describes the config symbol fully\n" . $herecurr);
3157                         }
3158                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
3159                 }
3160
3161 # check for MAINTAINERS entries that don't have the right form
3162                 if ($realfile =~ /^MAINTAINERS$/ &&
3163                     $rawline =~ /^\+[A-Z]:/ &&
3164                     $rawline !~ /^\+[A-Z]:\t\S/) {
3165                         if (WARN("MAINTAINERS_STYLE",
3166                                  "MAINTAINERS entries use one tab after TYPE:\n" . $herecurr) &&
3167                             $fix) {
3168                                 $fixed[$fixlinenr] =~ s/^(\+[A-Z]):\s*/$1:\t/;
3169                         }
3170                 }
3171
3172 # discourage the use of boolean for type definition attributes of Kconfig options
3173                 if ($realfile =~ /Kconfig/ &&
3174                     $line =~ /^\+\s*\bboolean\b/) {
3175                         WARN("CONFIG_TYPE_BOOLEAN",
3176                              "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
3177                 }
3178
3179                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
3180                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
3181                         my $flag = $1;
3182                         my $replacement = {
3183                                 'EXTRA_AFLAGS' =>   'asflags-y',
3184                                 'EXTRA_CFLAGS' =>   'ccflags-y',
3185                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
3186                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
3187                         };
3188
3189                         WARN("DEPRECATED_VARIABLE",
3190                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
3191                 }
3192
3193 # check for DT compatible documentation
3194                 if (defined $root &&
3195                         (($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
3196                          ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {
3197
3198                         my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
3199
3200                         my $dt_path = $root . "/Documentation/devicetree/bindings/";
3201                         my $vp_file = $dt_path . "vendor-prefixes.yaml";
3202
3203                         foreach my $compat (@compats) {
3204                                 my $compat2 = $compat;
3205                                 $compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
3206                                 my $compat3 = $compat;
3207                                 $compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
3208                                 `grep -Erq "$compat|$compat2|$compat3" $dt_path`;
3209                                 if ( $? >> 8 ) {
3210                                         WARN("UNDOCUMENTED_DT_STRING",
3211                                              "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
3212                                 }
3213
3214                                 next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
3215                                 my $vendor = $1;
3216                                 `grep -Eq "\\"\\^\Q$vendor\E,\\.\\*\\":" $vp_file`;
3217                                 if ( $? >> 8 ) {
3218                                         WARN("UNDOCUMENTED_DT_STRING",
3219                                              "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
3220                                 }
3221                         }
3222                 }
3223
3224 # check for using SPDX license tag at beginning of files
3225                 if ($realline == $checklicenseline) {
3226                         if ($rawline =~ /^[ \+]\s*\#\!\s*\//) {
3227                                 $checklicenseline = 2;
3228                         } elsif ($rawline =~ /^\+/) {
3229                                 my $comment = "";
3230                                 if ($realfile =~ /\.(h|s|S)$/) {
3231                                         $comment = '/*';
3232                                 } elsif ($realfile =~ /\.(c|dts|dtsi)$/) {
3233                                         $comment = '//';
3234                                 } elsif (($checklicenseline == 2) || $realfile =~ /\.(sh|pl|py|awk|tc|yaml)$/) {
3235                                         $comment = '#';
3236                                 } elsif ($realfile =~ /\.rst$/) {
3237                                         $comment = '..';
3238                                 }
3239
3240 # check SPDX comment style for .[chsS] files
3241                                 if ($realfile =~ /\.[chsS]$/ &&
3242                                     $rawline =~ /SPDX-License-Identifier:/ &&
3243                                     $rawline !~ m@^\+\s*\Q$comment\E\s*@) {
3244                                         WARN("SPDX_LICENSE_TAG",
3245                                              "Improper SPDX comment style for '$realfile', please use '$comment' instead\n" . $herecurr);
3246                                 }
3247
3248                                 if ($comment !~ /^$/ &&
3249                                     $rawline !~ m@^\+\Q$comment\E SPDX-License-Identifier: @) {
3250                                         WARN("SPDX_LICENSE_TAG",
3251                                              "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
3252                                 } elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
3253                                         my $spdx_license = $1;
3254                                         if (!is_SPDX_License_valid($spdx_license)) {
3255                                                 WARN("SPDX_LICENSE_TAG",
3256                                                      "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
3257                                         }
3258                                         if ($realfile =~ m@^Documentation/devicetree/bindings/@ &&
3259                                             not $spdx_license =~ /GPL-2\.0.*BSD-2-Clause/) {
3260                                                 my $msg_level = \&WARN;
3261                                                 $msg_level = \&CHK if ($file);
3262                                                 if (&{$msg_level}("SPDX_LICENSE_TAG",
3263
3264                                                                   "DT binding documents should be licensed (GPL-2.0-only OR BSD-2-Clause)\n" . $herecurr) &&
3265                                                     $fix) {
3266                                                         $fixed[$fixlinenr] =~ s/SPDX-License-Identifier: .*/SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)/;
3267                                                 }
3268                                         }
3269                                 }
3270                         }
3271                 }
3272
3273 # check we are in a valid source file if not then ignore this hunk
3274                 next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);
3275
3276 # check for using SPDX-License-Identifier on the wrong line number
3277                 if ($realline != $checklicenseline &&
3278                     $rawline =~ /\bSPDX-License-Identifier:/ &&
3279                     substr($line, @-, @+ - @-) eq "$;" x (@+ - @-)) {
3280                         WARN("SPDX_LICENSE_TAG",
3281                              "Misplaced SPDX-License-Identifier tag - use line $checklicenseline instead\n" . $herecurr);
3282                 }
3283
3284 # line length limit (with some exclusions)
3285 #
3286 # There are a few types of lines that may extend beyond $max_line_length:
3287 #       logging functions like pr_info that end in a string
3288 #       lines with a single string
3289 #       #defines that are a single string
3290 #       lines with an RFC3986 like URL
3291 #
3292 # There are 3 different line length message types:
3293 # LONG_LINE_COMMENT     a comment starts before but extends beyond $max_line_length
3294 # LONG_LINE_STRING      a string starts before but extends beyond $max_line_length
3295 # LONG_LINE             all other lines longer than $max_line_length
3296 #
3297 # if LONG_LINE is ignored, the other 2 types are also ignored
3298 #
3299
3300                 if ($line =~ /^\+/ && $length > $max_line_length) {
3301                         my $msg_type = "LONG_LINE";
3302
3303                         # Check the allowed long line types first
3304
3305                         # logging functions that end in a string that starts
3306                         # before $max_line_length
3307                         if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
3308                             length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
3309                                 $msg_type = "";
3310
3311                         # lines with only strings (w/ possible termination)
3312                         # #defines with only strings
3313                         } elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
3314                                  $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
3315                                 $msg_type = "";
3316
3317                         # More special cases
3318                         } elsif ($line =~ /^\+.*\bEFI_GUID\s*\(/ ||
3319                                  $line =~ /^\+\s*(?:\w+)?\s*DEFINE_PER_CPU/) {
3320                                 $msg_type = "";
3321
3322                         # URL ($rawline is used in case the URL is in a comment)
3323                         } elsif ($rawline =~ /^\+.*\b[a-z][\w\.\+\-]*:\/\/\S+/i) {
3324                                 $msg_type = "";
3325
3326                         # Otherwise set the alternate message types
3327
3328                         # a comment starts before $max_line_length
3329                         } elsif ($line =~ /($;[\s$;]*)$/ &&
3330                                  length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
3331                                 $msg_type = "LONG_LINE_COMMENT"
3332
3333                         # a quoted string starts before $max_line_length
3334                         } elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ &&
3335                                  length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
3336                                 $msg_type = "LONG_LINE_STRING"
3337                         }
3338
3339                         if ($msg_type ne "" &&
3340                             (show_type("LONG_LINE") || show_type($msg_type))) {
3341                                 my $msg_level = \&WARN;
3342                                 $msg_level = \&CHK if ($file);
3343                                 &{$msg_level}($msg_type,
3344                                               "line length of $length exceeds $max_line_length columns\n" . $herecurr);
3345                         }
3346                 }
3347
3348 # check for adding lines without a newline.
3349                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
3350                         WARN("MISSING_EOF_NEWLINE",
3351                              "adding a line without newline at end of file\n" . $herecurr);
3352                 }
3353
3354                 if ($u_boot) {
3355                         u_boot_line($realfile, $line, $rawline, $herecurr);
3356                 }
3357
3358 # check we are in a valid source file C or perl if not then ignore this hunk
3359                 next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
3360
3361 # at the beginning of a line any tabs must come first and anything
3362 # more than $tabsize must use tabs.
3363                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
3364                     $rawline =~ /^\+\s*        \s*/) {
3365                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3366                         $rpt_cleaners = 1;
3367                         if (ERROR("CODE_INDENT",
3368                                   "code indent should use tabs where possible\n" . $herevet) &&
3369                             $fix) {
3370                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
3371                         }
3372                 }
3373
3374 # check for space before tabs.
3375                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
3376                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3377                         if (WARN("SPACE_BEFORE_TAB",
3378                                 "please, no space before tabs\n" . $herevet) &&
3379                             $fix) {
3380                                 while ($fixed[$fixlinenr] =~
3381                                            s/(^\+.*) {$tabsize,$tabsize}\t/$1\t\t/) {}
3382                                 while ($fixed[$fixlinenr] =~
3383                                            s/(^\+.*) +\t/$1\t/) {}
3384                         }
3385                 }
3386
3387 # check for assignments on the start of a line
3388                 if ($sline =~ /^\+\s+($Assignment)[^=]/) {
3389                         CHK("ASSIGNMENT_CONTINUATIONS",
3390                             "Assignment operator '$1' should be on the previous line\n" . $hereprev);
3391                 }
3392
3393 # check for && or || at the start of a line
3394                 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
3395                         CHK("LOGICAL_CONTINUATIONS",
3396                             "Logical continuations should be on the previous line\n" . $hereprev);
3397                 }
3398
3399 # check indentation starts on a tab stop
3400                 if ($perl_version_ok &&
3401                     $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$)|$Declare\s*$Ident\s*[;=])/) {
3402                         my $indent = length($1);
3403                         if ($indent % $tabsize) {
3404                                 if (WARN("TABSTOP",
3405                                          "Statements should start on a tabstop\n" . $herecurr) &&
3406                                     $fix) {
3407                                         $fixed[$fixlinenr] =~ s@(^\+\t+) +@$1 . "\t" x ($indent/$tabsize)@e;
3408                                 }
3409                         }
3410                 }
3411
3412 # check multi-line statement indentation matches previous line
3413                 if ($perl_version_ok &&
3414                     $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|(?:\*\s*)*$Lval\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
3415                         $prevline =~ /^\+(\t*)(.*)$/;
3416                         my $oldindent = $1;
3417                         my $rest = $2;
3418
3419                         my $pos = pos_last_openparen($rest);
3420                         if ($pos >= 0) {
3421                                 $line =~ /^(\+| )([ \t]*)/;
3422                                 my $newindent = $2;
3423
3424                                 my $goodtabindent = $oldindent .
3425                                         "\t" x ($pos / $tabsize) .
3426                                         " "  x ($pos % $tabsize);
3427                                 my $goodspaceindent = $oldindent . " "  x $pos;
3428
3429                                 if ($newindent ne $goodtabindent &&
3430                                     $newindent ne $goodspaceindent) {
3431
3432                                         if (CHK("PARENTHESIS_ALIGNMENT",
3433                                                 "Alignment should match open parenthesis\n" . $hereprev) &&
3434                                             $fix && $line =~ /^\+/) {
3435                                                 $fixed[$fixlinenr] =~
3436                                                     s/^\+[ \t]*/\+$goodtabindent/;
3437                                         }
3438                                 }
3439                         }
3440                 }
3441
3442 # check for space after cast like "(int) foo" or "(struct foo) bar"
3443 # avoid checking a few false positives:
3444 #   "sizeof(<type>)" or "__alignof__(<type>)"
3445 #   function pointer declarations like "(*foo)(int) = bar;"
3446 #   structure definitions like "(struct foo) { 0 };"
3447 #   multiline macros that define functions
3448 #   known attributes or the __attribute__ keyword
3449                 if ($line =~ /^\+(.*)\(\s*$Type\s*\)([ \t]++)((?![={]|\\$|$Attribute|__attribute__))/ &&
3450                     (!defined($1) || $1 !~ /\b(?:sizeof|__alignof__)\s*$/)) {
3451                         if (CHK("SPACING",
3452                                 "No space is necessary after a cast\n" . $herecurr) &&
3453                             $fix) {
3454                                 $fixed[$fixlinenr] =~
3455                                     s/(\(\s*$Type\s*\))[ \t]+/$1/;
3456                         }
3457                 }
3458
3459 # Block comment styles
3460 # Networking with an initial /*
3461                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
3462                     $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
3463                     $rawline =~ /^\+[ \t]*\*/ &&
3464                     $realline > 2) {
3465                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
3466                              "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
3467                 }
3468
3469 # Block comments use * on subsequent lines
3470                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
3471                     $prevrawline =~ /^\+.*?\/\*/ &&             #starting /*
3472                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
3473                     $rawline =~ /^\+/ &&                        #line is new
3474                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
3475                         WARN("BLOCK_COMMENT_STYLE",
3476                              "Block comments use * on subsequent lines\n" . $hereprev);
3477                 }
3478
3479 # Block comments use */ on trailing lines
3480                 if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
3481                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
3482                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
3483                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
3484                         WARN("BLOCK_COMMENT_STYLE",
3485                              "Block comments use a trailing */ on a separate line\n" . $herecurr);
3486                 }
3487
3488 # Block comment * alignment
3489                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
3490                     $line =~ /^\+[ \t]*$;/ &&                   #leading comment
3491                     $rawline =~ /^\+[ \t]*\*/ &&                #leading *
3492                     (($prevrawline =~ /^\+.*?\/\*/ &&           #leading /*
3493                       $prevrawline !~ /\*\/[ \t]*$/) ||         #no trailing */
3494                      $prevrawline =~ /^\+[ \t]*\*/)) {          #leading *
3495                         my $oldindent;
3496                         $prevrawline =~ m@^\+([ \t]*/?)\*@;
3497                         if (defined($1)) {
3498                                 $oldindent = expand_tabs($1);
3499                         } else {
3500                                 $prevrawline =~ m@^\+(.*/?)\*@;
3501                                 $oldindent = expand_tabs($1);
3502                         }
3503                         $rawline =~ m@^\+([ \t]*)\*@;
3504                         my $newindent = $1;
3505                         $newindent = expand_tabs($newindent);
3506                         if (length($oldindent) ne length($newindent)) {
3507                                 WARN("BLOCK_COMMENT_STYLE",
3508                                      "Block comments should align the * on each line\n" . $hereprev);
3509                         }
3510                 }
3511
3512 # check for missing blank lines after struct/union declarations
3513 # with exceptions for various attributes and macros
3514                 if ($prevline =~ /^[\+ ]};?\s*$/ &&
3515                     $line =~ /^\+/ &&
3516                     !($line =~ /^\+\s*$/ ||
3517                       $line =~ /^\+\s*EXPORT_SYMBOL/ ||
3518                       $line =~ /^\+\s*MODULE_/i ||
3519                       $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
3520                       $line =~ /^\+[a-z_]*init/ ||
3521                       $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
3522                       $line =~ /^\+\s*DECLARE/ ||
3523                       $line =~ /^\+\s*builtin_[\w_]*driver/ ||
3524                       $line =~ /^\+\s*__setup/)) {
3525                         if (CHK("LINE_SPACING",
3526                                 "Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) &&
3527                             $fix) {
3528                                 fix_insert_line($fixlinenr, "\+");
3529                         }
3530                 }
3531
3532 # check for multiple consecutive blank lines
3533                 if ($prevline =~ /^[\+ ]\s*$/ &&
3534                     $line =~ /^\+\s*$/ &&
3535                     $last_blank_line != ($linenr - 1)) {
3536                         if (CHK("LINE_SPACING",
3537                                 "Please don't use multiple blank lines\n" . $hereprev) &&
3538                             $fix) {
3539                                 fix_delete_line($fixlinenr, $rawline);
3540                         }
3541
3542                         $last_blank_line = $linenr;
3543                 }
3544
3545 # check for missing blank lines after declarations
3546                 if ($sline =~ /^\+\s+\S/ &&                     #Not at char 1
3547                         # actual declarations
3548                     ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
3549                         # function pointer declarations
3550                      $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
3551                         # foo bar; where foo is some local typedef or #define
3552                      $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
3553                         # known declaration macros
3554                      $prevline =~ /^\+\s+$declaration_macros/) &&
3555                         # for "else if" which can look like "$Ident $Ident"
3556                     !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
3557                         # other possible extensions of declaration lines
3558                       $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
3559                         # not starting a section or a macro "\" extended line
3560                       $prevline =~ /(?:\{\s*|\\)$/) &&
3561                         # looks like a declaration
3562                     !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
3563                         # function pointer declarations
3564                       $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
3565                         # foo bar; where foo is some local typedef or #define
3566                       $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
3567                         # known declaration macros
3568                       $sline =~ /^\+\s+$declaration_macros/ ||
3569                         # start of struct or union or enum
3570                       $sline =~ /^\+\s+(?:static\s+)?(?:const\s+)?(?:union|struct|enum|typedef)\b/ ||
3571                         # start or end of block or continuation of declaration
3572                       $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
3573                         # bitfield continuation
3574                       $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
3575                         # other possible extensions of declaration lines
3576                       $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
3577                         # indentation of previous and current line are the same
3578                     (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
3579                         if (WARN("LINE_SPACING",
3580                                  "Missing a blank line after declarations\n" . $hereprev) &&
3581                             $fix) {
3582                                 fix_insert_line($fixlinenr, "\+");
3583                         }
3584                 }
3585
3586 # check for spaces at the beginning of a line.
3587 # Exceptions:
3588 #  1) within comments
3589 #  2) indented preprocessor commands
3590 #  3) hanging labels
3591                 if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {
3592                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3593                         if (WARN("LEADING_SPACE",
3594                                  "please, no spaces at the start of a line\n" . $herevet) &&
3595                             $fix) {
3596                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
3597                         }
3598                 }
3599
3600 # check we are in a valid C source file if not then ignore this hunk
3601                 next if ($realfile !~ /\.(h|c)$/);
3602
3603 # check for unusual line ending [ or (
3604                 if ($line =~ /^\+.*([\[\(])\s*$/) {
3605                         CHK("OPEN_ENDED_LINE",
3606                             "Lines should not end with a '$1'\n" . $herecurr);
3607                 }
3608
3609 # check if this appears to be the start function declaration, save the name
3610                 if ($sline =~ /^\+\{\s*$/ &&
3611                     $prevline =~ /^\+(?:(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*)?($Ident)\(/) {
3612                         $context_function = $1;
3613                 }
3614
3615 # check if this appears to be the end of function declaration
3616                 if ($sline =~ /^\+\}\s*$/) {
3617                         undef $context_function;
3618                 }
3619
3620 # check indentation of any line with a bare else
3621 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
3622 # if the previous line is a break or return and is indented 1 tab more...
3623                 if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
3624                         my $tabs = length($1) + 1;
3625                         if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
3626                             ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
3627                              defined $lines[$linenr] &&
3628                              $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
3629                                 WARN("UNNECESSARY_ELSE",
3630                                      "else is not generally useful after a break or return\n" . $hereprev);
3631                         }
3632                 }
3633
3634 # check indentation of a line with a break;
3635 # if the previous line is a goto or return and is indented the same # of tabs
3636                 if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
3637                         my $tabs = $1;
3638                         if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
3639                                 WARN("UNNECESSARY_BREAK",
3640                                      "break is not useful after a goto or return\n" . $hereprev);
3641                         }
3642                 }
3643
3644 # check for RCS/CVS revision markers
3645                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
3646                         WARN("CVS_KEYWORD",
3647                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
3648                 }
3649
3650 # check for old HOTPLUG __dev<foo> section markings
3651                 if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
3652                         WARN("HOTPLUG_SECTION",
3653                              "Using $1 is unnecessary\n" . $herecurr);
3654                 }
3655
3656 # Check for potential 'bare' types
3657                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
3658                     $realline_next);
3659 #print "LINE<$line>\n";
3660                 if ($linenr > $suppress_statement &&
3661                     $realcnt && $sline =~ /.\s*\S/) {
3662                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
3663                                 ctx_statement_block($linenr, $realcnt, 0);
3664                         $stat =~ s/\n./\n /g;
3665                         $cond =~ s/\n./\n /g;
3666
3667 #print "linenr<$linenr> <$stat>\n";
3668                         # If this statement has no statement boundaries within
3669                         # it there is no point in retrying a statement scan
3670                         # until we hit end of it.
3671                         my $frag = $stat; $frag =~ s/;+\s*$//;
3672                         if ($frag !~ /(?:{|;)/) {
3673 #print "skip<$line_nr_next>\n";
3674                                 $suppress_statement = $line_nr_next;
3675                         }
3676
3677                         # Find the real next line.
3678                         $realline_next = $line_nr_next;
3679                         if (defined $realline_next &&
3680                             (!defined $lines[$realline_next - 1] ||
3681                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
3682                                 $realline_next++;
3683                         }
3684
3685                         my $s = $stat;
3686                         $s =~ s/{.*$//s;
3687
3688                         # Ignore goto labels.
3689                         if ($s =~ /$Ident:\*$/s) {
3690
3691                         # Ignore functions being called
3692                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
3693
3694                         } elsif ($s =~ /^.\s*else\b/s) {
3695
3696                         # declarations always start with types
3697                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
3698                                 my $type = $1;
3699                                 $type =~ s/\s+/ /g;
3700                                 possible($type, "A:" . $s);
3701
3702                         # definitions in global scope can only start with types
3703                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
3704                                 possible($1, "B:" . $s);
3705                         }
3706
3707                         # any (foo ... *) is a pointer cast, and foo is a type
3708                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
3709                                 possible($1, "C:" . $s);
3710                         }
3711
3712                         # Check for any sort of function declaration.
3713                         # int foo(something bar, other baz);
3714                         # void (*store_gdt)(x86_descr_ptr *);
3715                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
3716                                 my ($name_len) = length($1);
3717
3718                                 my $ctx = $s;
3719                                 substr($ctx, 0, $name_len + 1, '');
3720                                 $ctx =~ s/\)[^\)]*$//;
3721
3722                                 for my $arg (split(/\s*,\s*/, $ctx)) {
3723                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
3724
3725                                                 possible($1, "D:" . $s);
3726                                         }
3727                                 }
3728                         }
3729
3730                 }
3731
3732 #
3733 # Checks which may be anchored in the context.
3734 #
3735
3736 # Check for switch () and associated case and default
3737 # statements should be at the same indent.
3738                 if ($line=~/\bswitch\s*\(.*\)/) {
3739                         my $err = '';
3740                         my $sep = '';
3741                         my @ctx = ctx_block_outer($linenr, $realcnt);
3742                         shift(@ctx);
3743                         for my $ctx (@ctx) {
3744                                 my ($clen, $cindent) = line_stats($ctx);
3745                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
3746                                                         $indent != $cindent) {
3747                                         $err .= "$sep$ctx\n";
3748                                         $sep = '';
3749                                 } else {
3750                                         $sep = "[...]\n";
3751                                 }
3752                         }
3753                         if ($err ne '') {
3754                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
3755                                       "switch and case should be at the same indent\n$hereline$err");
3756                         }
3757                 }
3758
3759 # if/while/etc brace do not go on next line, unless defining a do while loop,
3760 # or if that brace on the next line is for something else
3761                 if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
3762                         my $pre_ctx = "$1$2";
3763
3764                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
3765
3766                         if ($line =~ /^\+\t{6,}/) {
3767                                 WARN("DEEP_INDENTATION",
3768                                      "Too many leading tabs - consider code refactoring\n" . $herecurr);
3769                         }
3770
3771                         my $ctx_cnt = $realcnt - $#ctx - 1;
3772                         my $ctx = join("\n", @ctx);
3773
3774                         my $ctx_ln = $linenr;
3775                         my $ctx_skip = $realcnt;
3776
3777                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
3778                                         defined $lines[$ctx_ln - 1] &&
3779                                         $lines[$ctx_ln - 1] =~ /^-/)) {
3780                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
3781                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
3782                                 $ctx_ln++;
3783                         }
3784
3785                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
3786                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
3787
3788                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
3789                                 ERROR("OPEN_BRACE",
3790                                       "that open brace { should be on the previous line\n" .
3791                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
3792                         }
3793                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
3794                             $ctx =~ /\)\s*\;\s*$/ &&
3795                             defined $lines[$ctx_ln - 1])
3796                         {
3797                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
3798                                 if ($nindent > $indent) {
3799                                         WARN("TRAILING_SEMICOLON",
3800                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
3801                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
3802                                 }
3803                         }
3804                 }
3805
3806 # Check relative indent for conditionals and blocks.
3807                 if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|(?:do|else)\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
3808                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
3809                                 ctx_statement_block($linenr, $realcnt, 0)
3810                                         if (!defined $stat);
3811                         my ($s, $c) = ($stat, $cond);
3812
3813                         substr($s, 0, length($c), '');
3814
3815                         # remove inline comments
3816                         $s =~ s/$;/ /g;
3817                         $c =~ s/$;/ /g;
3818
3819                         # Find out how long the conditional actually is.
3820                         my @newlines = ($c =~ /\n/gs);
3821                         my $cond_lines = 1 + $#newlines;
3822
3823                         # Make sure we remove the line prefixes as we have
3824                         # none on the first line, and are going to readd them
3825                         # where necessary.
3826                         $s =~ s/\n./\n/gs;
3827                         while ($s =~ /\n\s+\\\n/) {
3828                                 $cond_lines += $s =~ s/\n\s+\\\n/\n/g;
3829                         }
3830
3831                         # We want to check the first line inside the block
3832                         # starting at the end of the conditional, so remove:
3833                         #  1) any blank line termination
3834                         #  2) any opening brace { on end of the line
3835                         #  3) any do (...) {
3836                         my $continuation = 0;
3837                         my $check = 0;
3838                         $s =~ s/^.*\bdo\b//;
3839                         $s =~ s/^\s*{//;
3840                         if ($s =~ s/^\s*\\//) {
3841                                 $continuation = 1;
3842                         }
3843                         if ($s =~ s/^\s*?\n//) {
3844                                 $check = 1;
3845                                 $cond_lines++;
3846                         }
3847
3848                         # Also ignore a loop construct at the end of a
3849                         # preprocessor statement.
3850                         if (($prevline =~ /^.\s*#\s*define\s/ ||
3851                             $prevline =~ /\\\s*$/) && $continuation == 0) {
3852                                 $check = 0;
3853                         }
3854
3855                         my $cond_ptr = -1;
3856                         $continuation = 0;
3857                         while ($cond_ptr != $cond_lines) {
3858                                 $cond_ptr = $cond_lines;
3859
3860                                 # If we see an #else/#elif then the code
3861                                 # is not linear.
3862                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
3863                                         $check = 0;
3864                                 }
3865
3866                                 # Ignore:
3867                                 #  1) blank lines, they should be at 0,
3868                                 #  2) preprocessor lines, and
3869                                 #  3) labels.
3870                                 if ($continuation ||
3871                                     $s =~ /^\s*?\n/ ||
3872                                     $s =~ /^\s*#\s*?/ ||
3873                                     $s =~ /^\s*$Ident\s*:/) {
3874                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
3875                                         if ($s =~ s/^.*?\n//) {
3876                                                 $cond_lines++;
3877                                         }
3878                                 }
3879                         }
3880
3881                         my (undef, $sindent) = line_stats("+" . $s);
3882                         my $stat_real = raw_line($linenr, $cond_lines);
3883
3884                         # Check if either of these lines are modified, else
3885                         # this is not this patch's fault.
3886                         if (!defined($stat_real) ||
3887                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
3888                                 $check = 0;
3889                         }
3890                         if (defined($stat_real) && $cond_lines > 1) {
3891                                 $stat_real = "[...]\n$stat_real";
3892                         }
3893
3894                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
3895
3896                         if ($check && $s ne '' &&
3897                             (($sindent % $tabsize) != 0 ||
3898                              ($sindent < $indent) ||
3899                              ($sindent == $indent &&
3900                               ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
3901                              ($sindent > $indent + $tabsize))) {
3902                                 WARN("SUSPECT_CODE_INDENT",
3903                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
3904                         }
3905                 }
3906
3907                 # Track the 'values' across context and added lines.
3908                 my $opline = $line; $opline =~ s/^./ /;
3909                 my ($curr_values, $curr_vars) =
3910                                 annotate_values($opline . "\n", $prev_values);
3911                 $curr_values = $prev_values . $curr_values;
3912                 if ($dbg_values) {
3913                         my $outline = $opline; $outline =~ s/\t/ /g;
3914                         print "$linenr > .$outline\n";
3915                         print "$linenr > $curr_values\n";
3916                         print "$linenr >  $curr_vars\n";
3917                 }
3918                 $prev_values = substr($curr_values, -1);
3919
3920 #ignore lines not being added
3921                 next if ($line =~ /^[^\+]/);
3922
3923 # check for dereferences that span multiple lines
3924                 if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ &&
3925                     $line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) {
3926                         $prevline =~ /($Lval\s*(?:\.|->))\s*$/;
3927                         my $ref = $1;
3928                         $line =~ /^.\s*($Lval)/;
3929                         $ref .= $1;
3930                         $ref =~ s/\s//g;
3931                         WARN("MULTILINE_DEREFERENCE",
3932                              "Avoid multiple line dereference - prefer '$ref'\n" . $hereprev);
3933                 }
3934
3935 # check for declarations of signed or unsigned without int
3936                 while ($line =~ m{\b($Declare)\s*(?!char\b|short\b|int\b|long\b)\s*($Ident)?\s*[=,;\[\)\(]}g) {
3937                         my $type = $1;
3938                         my $var = $2;
3939                         $var = "" if (!defined $var);
3940                         if ($type =~ /^(?:(?:$Storage|$Inline|$Attribute)\s+)*((?:un)?signed)((?:\s*\*)*)\s*$/) {
3941                                 my $sign = $1;
3942                                 my $pointer = $2;
3943
3944                                 $pointer = "" if (!defined $pointer);
3945
3946                                 if (WARN("UNSPECIFIED_INT",
3947                                          "Prefer '" . trim($sign) . " int" . rtrim($pointer) . "' to bare use of '$sign" . rtrim($pointer) . "'\n" . $herecurr) &&
3948                                     $fix) {
3949                                         my $decl = trim($sign) . " int ";
3950                                         my $comp_pointer = $pointer;
3951                                         $comp_pointer =~ s/\s//g;
3952                                         $decl .= $comp_pointer;
3953                                         $decl = rtrim($decl) if ($var eq "");
3954                                         $fixed[$fixlinenr] =~ s@\b$sign\s*\Q$pointer\E\s*$var\b@$decl$var@;
3955                                 }
3956                         }
3957                 }
3958
3959 # TEST: allow direct testing of the type matcher.
3960                 if ($dbg_type) {
3961                         if ($line =~ /^.\s*$Declare\s*$/) {
3962                                 ERROR("TEST_TYPE",
3963                                       "TEST: is type\n" . $herecurr);
3964                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
3965                                 ERROR("TEST_NOT_TYPE",
3966                                       "TEST: is not type ($1 is)\n". $herecurr);
3967                         }
3968                         next;
3969                 }
3970 # TEST: allow direct testing of the attribute matcher.
3971                 if ($dbg_attr) {
3972                         if ($line =~ /^.\s*$Modifier\s*$/) {
3973                                 ERROR("TEST_ATTR",
3974                                       "TEST: is attr\n" . $herecurr);
3975                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
3976                                 ERROR("TEST_NOT_ATTR",
3977                                       "TEST: is not attr ($1 is)\n". $herecurr);
3978                         }
3979                         next;
3980                 }
3981
3982 # check for initialisation to aggregates open brace on the next line
3983                 if ($line =~ /^.\s*{/ &&
3984                     $prevline =~ /(?:^|[^=])=\s*$/) {
3985                         if (ERROR("OPEN_BRACE",
3986                                   "that open brace { should be on the previous line\n" . $hereprev) &&
3987                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3988                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3989                                 fix_delete_line($fixlinenr, $rawline);
3990                                 my $fixedline = $prevrawline;
3991                                 $fixedline =~ s/\s*=\s*$/ = {/;
3992                                 fix_insert_line($fixlinenr, $fixedline);
3993                                 $fixedline = $line;
3994                                 $fixedline =~ s/^(.\s*)\{\s*/$1/;
3995                                 fix_insert_line($fixlinenr, $fixedline);
3996                         }
3997                 }
3998
3999 #
4000 # Checks which are anchored on the added line.
4001 #
4002
4003 # check for malformed paths in #include statements (uses RAW line)
4004                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
4005                         my $path = $1;
4006                         if ($path =~ m{//}) {
4007                                 ERROR("MALFORMED_INCLUDE",
4008                                       "malformed #include filename\n" . $herecurr);
4009                         }
4010                         if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
4011                                 ERROR("UAPI_INCLUDE",
4012                                       "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
4013                         }
4014                 }
4015
4016 # no C99 // comments
4017                 if ($line =~ m{//}) {
4018                         if (ERROR("C99_COMMENTS",
4019                                   "do not use C99 // comments\n" . $herecurr) &&
4020                             $fix) {
4021                                 my $line = $fixed[$fixlinenr];
4022                                 if ($line =~ /\/\/(.*)$/) {
4023                                         my $comment = trim($1);
4024                                         $fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@;
4025                                 }
4026                         }
4027                 }
4028                 # Remove C99 comments.
4029                 $line =~ s@//.*@@;
4030                 $opline =~ s@//.*@@;
4031
4032 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
4033 # the whole statement.
4034 #print "APW <$lines[$realline_next - 1]>\n";
4035                 if (defined $realline_next &&
4036                     exists $lines[$realline_next - 1] &&
4037                     !defined $suppress_export{$realline_next} &&
4038                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
4039                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
4040                         # Handle definitions which produce identifiers with
4041                         # a prefix:
4042                         #   XXX(foo);
4043                         #   EXPORT_SYMBOL(something_foo);
4044                         my $name = $1;
4045                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
4046                             $name =~ /^${Ident}_$2/) {
4047 #print "FOO C name<$name>\n";
4048                                 $suppress_export{$realline_next} = 1;
4049
4050                         } elsif ($stat !~ /(?:
4051                                 \n.}\s*$|
4052                                 ^.DEFINE_$Ident\(\Q$name\E\)|
4053                                 ^.DECLARE_$Ident\(\Q$name\E\)|
4054                                 ^.LIST_HEAD\(\Q$name\E\)|
4055                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
4056                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
4057                             )/x) {
4058 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
4059                                 $suppress_export{$realline_next} = 2;
4060                         } else {
4061                                 $suppress_export{$realline_next} = 1;
4062                         }
4063                 }
4064                 if (!defined $suppress_export{$linenr} &&
4065                     $prevline =~ /^.\s*$/ &&
4066                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
4067                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
4068 #print "FOO B <$lines[$linenr - 1]>\n";
4069                         $suppress_export{$linenr} = 2;
4070                 }
4071                 if (defined $suppress_export{$linenr} &&
4072                     $suppress_export{$linenr} == 2) {
4073                         WARN("EXPORT_SYMBOL",
4074                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
4075                 }
4076
4077 # check for global initialisers.
4078                 if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/) {
4079                         if (ERROR("GLOBAL_INITIALISERS",
4080                                   "do not initialise globals to $1\n" . $herecurr) &&
4081                             $fix) {
4082                                 $fixed[$fixlinenr] =~ s/(^.$Type\s*$Ident(?:\s+$Modifier)*)\s*=\s*$zero_initializer\s*;/$1;/;
4083                         }
4084                 }
4085 # check for static initialisers.
4086                 if ($line =~ /^\+.*\bstatic\s.*=\s*($zero_initializer)\s*;/) {
4087                         if (ERROR("INITIALISED_STATIC",
4088                                   "do not initialise statics to $1\n" .
4089                                       $herecurr) &&
4090                             $fix) {
4091                                 $fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*$zero_initializer\s*;/$1;/;
4092                         }
4093                 }
4094
4095 # check for misordered declarations of char/short/int/long with signed/unsigned
4096                 while ($sline =~ m{(\b$TypeMisordered\b)}g) {
4097                         my $tmp = trim($1);
4098                         WARN("MISORDERED_TYPE",
4099                              "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
4100                 }
4101
4102 # check for unnecessary <signed> int declarations of short/long/long long
4103                 while ($sline =~ m{\b($TypeMisordered(\s*\*)*|$C90_int_types)\b}g) {
4104                         my $type = trim($1);
4105                         next if ($type !~ /\bint\b/);
4106                         next if ($type !~ /\b(?:short|long\s+long|long)\b/);
4107                         my $new_type = $type;
4108                         $new_type =~ s/\b\s*int\s*\b/ /;
4109                         $new_type =~ s/\b\s*(?:un)?signed\b\s*/ /;
4110                         $new_type =~ s/^const\s+//;
4111                         $new_type = "unsigned $new_type" if ($type =~ /\bunsigned\b/);
4112                         $new_type = "const $new_type" if ($type =~ /^const\b/);
4113                         $new_type =~ s/\s+/ /g;
4114                         $new_type = trim($new_type);
4115                         if (WARN("UNNECESSARY_INT",
4116                                  "Prefer '$new_type' over '$type' as the int is unnecessary\n" . $herecurr) &&
4117                             $fix) {
4118                                 $fixed[$fixlinenr] =~ s/\b\Q$type\E\b/$new_type/;
4119                         }
4120                 }
4121
4122 # check for static const char * arrays.
4123                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
4124                         WARN("STATIC_CONST_CHAR_ARRAY",
4125                              "static const char * array should probably be static const char * const\n" .
4126                                 $herecurr);
4127                 }
4128
4129 # check for initialized const char arrays that should be static const
4130                 if ($line =~ /^\+\s*const\s+(char|unsigned\s+char|_*u8|(?:[us]_)?int8_t)\s+\w+\s*\[\s*(?:\w+\s*)?\]\s*=\s*"/) {
4131                         if (WARN("STATIC_CONST_CHAR_ARRAY",
4132                                  "const array should probably be static const\n" . $herecurr) &&
4133                             $fix) {
4134                                 $fixed[$fixlinenr] =~ s/(^.\s*)const\b/${1}static const/;
4135                         }
4136                 }
4137
4138 # check for static char foo[] = "bar" declarations.
4139                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
4140                         WARN("STATIC_CONST_CHAR_ARRAY",
4141                              "static char array declaration should probably be static const char\n" .
4142                                 $herecurr);
4143                 }
4144
4145 # check for const <foo> const where <foo> is not a pointer or array type
4146                 if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {
4147                         my $found = $1;
4148                         if ($sline =~ /\bconst\s+\Q$found\E\s+const\b\s*\*/) {
4149                                 WARN("CONST_CONST",
4150                                      "'const $found const *' should probably be 'const $found * const'\n" . $herecurr);
4151                         } elsif ($sline !~ /\bconst\s+\Q$found\E\s+const\s+\w+\s*\[/) {
4152                                 WARN("CONST_CONST",
4153                                      "'const $found const' should probably be 'const $found'\n" . $herecurr);
4154                         }
4155                 }
4156
4157 # check for non-global char *foo[] = {"bar", ...} declarations.
4158                 if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
4159                         WARN("STATIC_CONST_CHAR_ARRAY",
4160                              "char * array declaration might be better as static const\n" .
4161                                 $herecurr);
4162                }
4163
4164 # check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
4165                 if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
4166                         my $array = $1;
4167                         if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
4168                                 my $array_div = $1;
4169                                 if (WARN("ARRAY_SIZE",
4170                                          "Prefer ARRAY_SIZE($array)\n" . $herecurr) &&
4171                                     $fix) {
4172                                         $fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
4173                                 }
4174                         }
4175                 }
4176
4177 # check for function declarations without arguments like "int foo()"
4178                 if ($line =~ /(\b$Type\s*$Ident)\s*\(\s*\)/) {
4179                         if (ERROR("FUNCTION_WITHOUT_ARGS",
4180                                   "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
4181                             $fix) {
4182                                 $fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
4183                         }
4184                 }
4185
4186 # check for new typedefs, only function parameters and sparse annotations
4187 # make sense.
4188                 if ($line =~ /\btypedef\s/ &&
4189                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
4190                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
4191                     $line !~ /\b$typeTypedefs\b/ &&
4192                     $line !~ /\b__bitwise\b/) {
4193                         WARN("NEW_TYPEDEFS",
4194                              "do not add new typedefs\n" . $herecurr);
4195                 }
4196
4197 # * goes on variable not on type
4198                 # (char*[ const])
4199                 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
4200                         #print "AA<$1>\n";
4201                         my ($ident, $from, $to) = ($1, $2, $2);
4202
4203                         # Should start with a space.
4204                         $to =~ s/^(\S)/ $1/;
4205                         # Should not end with a space.
4206                         $to =~ s/\s+$//;
4207                         # '*'s should not have spaces between.
4208                         while ($to =~ s/\*\s+\*/\*\*/) {
4209                         }
4210
4211 ##                      print "1: from<$from> to<$to> ident<$ident>\n";
4212                         if ($from ne $to) {
4213                                 if (ERROR("POINTER_LOCATION",
4214                                           "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
4215                                     $fix) {
4216                                         my $sub_from = $ident;
4217                                         my $sub_to = $ident;
4218                                         $sub_to =~ s/\Q$from\E/$to/;
4219                                         $fixed[$fixlinenr] =~
4220                                             s@\Q$sub_from\E@$sub_to@;
4221                                 }
4222                         }
4223                 }
4224                 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
4225                         #print "BB<$1>\n";
4226                         my ($match, $from, $to, $ident) = ($1, $2, $2, $3);
4227
4228                         # Should start with a space.
4229                         $to =~ s/^(\S)/ $1/;
4230                         # Should not end with a space.
4231                         $to =~ s/\s+$//;
4232                         # '*'s should not have spaces between.
4233                         while ($to =~ s/\*\s+\*/\*\*/) {
4234                         }
4235                         # Modifiers should have spaces.
4236                         $to =~ s/(\b$Modifier$)/$1 /;
4237
4238 ##                      print "2: from<$from> to<$to> ident<$ident>\n";
4239                         if ($from ne $to && $ident !~ /^$Modifier$/) {
4240                                 if (ERROR("POINTER_LOCATION",
4241                                           "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
4242                                     $fix) {
4243
4244                                         my $sub_from = $match;
4245                                         my $sub_to = $match;
4246                                         $sub_to =~ s/\Q$from\E/$to/;
4247                                         $fixed[$fixlinenr] =~
4248                                             s@\Q$sub_from\E@$sub_to@;
4249                                 }
4250                         }
4251                 }
4252
4253 # avoid BUG() or BUG_ON()
4254                 if ($line =~ /\b(?:BUG|BUG_ON)\b/) {
4255                         my $msg_level = \&WARN;
4256                         $msg_level = \&CHK if ($file);
4257                         &{$msg_level}("AVOID_BUG",
4258                                       "Avoid crashing the kernel - try using WARN_ON & recovery code rather than BUG() or BUG_ON()\n" . $herecurr);
4259                 }
4260
4261 # avoid LINUX_VERSION_CODE
4262                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
4263                         WARN("LINUX_VERSION_CODE",
4264                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
4265                 }
4266
4267 # check for uses of printk_ratelimit
4268                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
4269                         WARN("PRINTK_RATELIMITED",
4270                              "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
4271                 }
4272
4273 # printk should use KERN_* levels
4274                 if ($line =~ /\bprintk\s*\(\s*(?!KERN_[A-Z]+\b)/) {
4275                         WARN("PRINTK_WITHOUT_KERN_LEVEL",
4276                              "printk() should include KERN_<LEVEL> facility level\n" . $herecurr);
4277                 }
4278
4279                 if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
4280                         my $orig = $1;
4281                         my $level = lc($orig);
4282                         $level = "warn" if ($level eq "warning");
4283                         my $level2 = $level;
4284                         $level2 = "dbg" if ($level eq "debug");
4285                         WARN("PREFER_PR_LEVEL",
4286                              "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
4287                 }
4288
4289                 if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
4290                         my $orig = $1;
4291                         my $level = lc($orig);
4292                         $level = "warn" if ($level eq "warning");
4293                         $level = "dbg" if ($level eq "debug");
4294                         WARN("PREFER_DEV_LEVEL",
4295                              "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
4296                 }
4297
4298 # ENOSYS means "bad syscall nr" and nothing else.  This will have a small
4299 # number of false positives, but assembly files are not checked, so at
4300 # least the arch entry code will not trigger this warning.
4301                 if ($line =~ /\bENOSYS\b/) {
4302                         WARN("ENOSYS",
4303                              "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr);
4304                 }
4305
4306 # function brace can't be on same line, except for #defines of do while,
4307 # or if closed on same line
4308                 if ($perl_version_ok &&
4309                     $sline =~ /$Type\s*$Ident\s*$balanced_parens\s*\{/ &&
4310                     $sline !~ /\#\s*define\b.*do\s*\{/ &&
4311                     $sline !~ /}/) {
4312                         if (ERROR("OPEN_BRACE",
4313                                   "open brace '{' following function definitions go on the next line\n" . $herecurr) &&
4314                             $fix) {
4315                                 fix_delete_line($fixlinenr, $rawline);
4316                                 my $fixed_line = $rawline;
4317                                 $fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/;
4318                                 my $line1 = $1;
4319                                 my $line2 = $2;
4320                                 fix_insert_line($fixlinenr, ltrim($line1));
4321                                 fix_insert_line($fixlinenr, "\+{");
4322                                 if ($line2 !~ /^\s*$/) {
4323                                         fix_insert_line($fixlinenr, "\+\t" . trim($line2));
4324                                 }
4325                         }
4326                 }
4327
4328 # open braces for enum, union and struct go on the same line.
4329                 if ($line =~ /^.\s*{/ &&
4330                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
4331                         if (ERROR("OPEN_BRACE",
4332                                   "open brace '{' following $1 go on the same line\n" . $hereprev) &&
4333                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4334                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4335                                 fix_delete_line($fixlinenr, $rawline);
4336                                 my $fixedline = rtrim($prevrawline) . " {";
4337                                 fix_insert_line($fixlinenr, $fixedline);
4338                                 $fixedline = $rawline;
4339                                 $fixedline =~ s/^(.\s*)\{\s*/$1\t/;
4340                                 if ($fixedline !~ /^\+\s*$/) {
4341                                         fix_insert_line($fixlinenr, $fixedline);
4342                                 }
4343                         }
4344                 }
4345
4346 # missing space after union, struct or enum definition
4347                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
4348                         if (WARN("SPACING",
4349                                  "missing space after $1 definition\n" . $herecurr) &&
4350                             $fix) {
4351                                 $fixed[$fixlinenr] =~
4352                                     s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
4353                         }
4354                 }
4355
4356 # Function pointer declarations
4357 # check spacing between type, funcptr, and args
4358 # canonical declaration is "type (*funcptr)(args...)"
4359                 if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
4360                         my $declare = $1;
4361                         my $pre_pointer_space = $2;
4362                         my $post_pointer_space = $3;
4363                         my $funcname = $4;
4364                         my $post_funcname_space = $5;
4365                         my $pre_args_space = $6;
4366
4367 # the $Declare variable will capture all spaces after the type
4368 # so check it for a missing trailing missing space but pointer return types
4369 # don't need a space so don't warn for those.
4370                         my $post_declare_space = "";
4371                         if ($declare =~ /(\s+)$/) {
4372                                 $post_declare_space = $1;
4373                                 $declare = rtrim($declare);
4374                         }
4375                         if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
4376                                 WARN("SPACING",
4377                                      "missing space after return type\n" . $herecurr);
4378                                 $post_declare_space = " ";
4379                         }
4380
4381 # unnecessary space "type  (*funcptr)(args...)"
4382 # This test is not currently implemented because these declarations are
4383 # equivalent to
4384 #       int  foo(int bar, ...)
4385 # and this is form shouldn't/doesn't generate a checkpatch warning.
4386 #
4387 #                       elsif ($declare =~ /\s{2,}$/) {
4388 #                               WARN("SPACING",
4389 #                                    "Multiple spaces after return type\n" . $herecurr);
4390 #                       }
4391
4392 # unnecessary space "type ( *funcptr)(args...)"
4393                         if (defined $pre_pointer_space &&
4394                             $pre_pointer_space =~ /^\s/) {
4395                                 WARN("SPACING",
4396                                      "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
4397                         }
4398
4399 # unnecessary space "type (* funcptr)(args...)"
4400                         if (defined $post_pointer_space &&
4401                             $post_pointer_space =~ /^\s/) {
4402                                 WARN("SPACING",
4403                                      "Unnecessary space before function pointer name\n" . $herecurr);
4404                         }
4405
4406 # unnecessary space "type (*funcptr )(args...)"
4407                         if (defined $post_funcname_space &&
4408                             $post_funcname_space =~ /^\s/) {
4409                                 WARN("SPACING",
4410                                      "Unnecessary space after function pointer name\n" . $herecurr);
4411                         }
4412
4413 # unnecessary space "type (*funcptr) (args...)"
4414                         if (defined $pre_args_space &&
4415                             $pre_args_space =~ /^\s/) {
4416                                 WARN("SPACING",
4417                                      "Unnecessary space before function pointer arguments\n" . $herecurr);
4418                         }
4419
4420                         if (show_type("SPACING") && $fix) {
4421                                 $fixed[$fixlinenr] =~
4422                                     s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
4423                         }
4424                 }
4425
4426 # check for spacing round square brackets; allowed:
4427 #  1. with a type on the left -- int [] a;
4428 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
4429 #  3. inside a curly brace -- = { [0...10] = 5 }
4430                 while ($line =~ /(.*?\s)\[/g) {
4431                         my ($where, $prefix) = ($-[1], $1);
4432                         if ($prefix !~ /$Type\s+$/ &&
4433                             ($where != 0 || $prefix !~ /^.\s+$/) &&
4434                             $prefix !~ /[{,:]\s+$/) {
4435                                 if (ERROR("BRACKET_SPACE",
4436                                           "space prohibited before open square bracket '['\n" . $herecurr) &&
4437                                     $fix) {
4438                                     $fixed[$fixlinenr] =~
4439                                         s/^(\+.*?)\s+\[/$1\[/;
4440                                 }
4441                         }
4442                 }
4443
4444 # check for spaces between functions and their parentheses.
4445                 while ($line =~ /($Ident)\s+\(/g) {
4446                         my $name = $1;
4447                         my $ctx_before = substr($line, 0, $-[1]);
4448                         my $ctx = "$ctx_before$name";
4449
4450                         # Ignore those directives where spaces _are_ permitted.
4451                         if ($name =~ /^(?:
4452                                 if|for|while|switch|return|case|
4453                                 volatile|__volatile__|
4454                                 __attribute__|format|__extension__|
4455                                 asm|__asm__)$/x)
4456                         {
4457                         # cpp #define statements have non-optional spaces, ie
4458                         # if there is a space between the name and the open
4459                         # parenthesis it is simply not a parameter group.
4460                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
4461
4462                         # cpp #elif statement condition may start with a (
4463                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
4464
4465                         # If this whole things ends with a type its most
4466                         # likely a typedef for a function.
4467                         } elsif ($ctx =~ /$Type$/) {
4468
4469                         } else {
4470                                 if (WARN("SPACING",
4471                                          "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
4472                                              $fix) {
4473                                         $fixed[$fixlinenr] =~
4474                                             s/\b$name\s+\(/$name\(/;
4475                                 }
4476                         }
4477                 }
4478
4479 # Check operator spacing.
4480                 if (!($line=~/\#\s*include/)) {
4481                         my $fixed_line = "";
4482                         my $line_fixed = 0;
4483
4484                         my $ops = qr{
4485                                 <<=|>>=|<=|>=|==|!=|
4486                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
4487                                 =>|->|<<|>>|<|>|=|!|~|
4488                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
4489                                 \?:|\?|:
4490                         }x;
4491                         my @elements = split(/($ops|;)/, $opline);
4492
4493 ##                      print("element count: <" . $#elements . ">\n");
4494 ##                      foreach my $el (@elements) {
4495 ##                              print("el: <$el>\n");
4496 ##                      }
4497
4498                         my @fix_elements = ();
4499                         my $off = 0;
4500
4501                         foreach my $el (@elements) {
4502                                 push(@fix_elements, substr($rawline, $off, length($el)));
4503                                 $off += length($el);
4504                         }
4505
4506                         $off = 0;
4507
4508                         my $blank = copy_spacing($opline);
4509                         my $last_after = -1;
4510
4511                         for (my $n = 0; $n < $#elements; $n += 2) {
4512
4513                                 my $good = $fix_elements[$n] . $fix_elements[$n + 1];
4514
4515 ##                              print("n: <$n> good: <$good>\n");
4516
4517                                 $off += length($elements[$n]);
4518
4519                                 # Pick up the preceding and succeeding characters.
4520                                 my $ca = substr($opline, 0, $off);
4521                                 my $cc = '';
4522                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
4523                                         $cc = substr($opline, $off + length($elements[$n + 1]));
4524                                 }
4525                                 my $cb = "$ca$;$cc";
4526
4527                                 my $a = '';
4528                                 $a = 'V' if ($elements[$n] ne '');
4529                                 $a = 'W' if ($elements[$n] =~ /\s$/);
4530                                 $a = 'C' if ($elements[$n] =~ /$;$/);
4531                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
4532                                 $a = 'O' if ($elements[$n] eq '');
4533                                 $a = 'E' if ($ca =~ /^\s*$/);
4534
4535                                 my $op = $elements[$n + 1];
4536
4537                                 my $c = '';
4538                                 if (defined $elements[$n + 2]) {
4539                                         $c = 'V' if ($elements[$n + 2] ne '');
4540                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
4541                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
4542                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
4543                                         $c = 'O' if ($elements[$n + 2] eq '');
4544                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
4545                                 } else {
4546                                         $c = 'E';
4547                                 }
4548
4549                                 my $ctx = "${a}x${c}";
4550
4551                                 my $at = "(ctx:$ctx)";
4552
4553                                 my $ptr = substr($blank, 0, $off) . "^";
4554                                 my $hereptr = "$hereline$ptr\n";
4555
4556                                 # Pull out the value of this operator.
4557                                 my $op_type = substr($curr_values, $off + 1, 1);
4558
4559                                 # Get the full operator variant.
4560                                 my $opv = $op . substr($curr_vars, $off, 1);
4561
4562                                 # Ignore operators passed as parameters.
4563                                 if ($op_type ne 'V' &&
4564                                     $ca =~ /\s$/ && $cc =~ /^\s*[,\)]/) {
4565
4566 #                               # Ignore comments
4567 #                               } elsif ($op =~ /^$;+$/) {
4568
4569                                 # ; should have either the end of line or a space or \ after it
4570                                 } elsif ($op eq ';') {
4571                                         if ($ctx !~ /.x[WEBC]/ &&
4572                                             $cc !~ /^\\/ && $cc !~ /^;/) {
4573                                                 if (ERROR("SPACING",
4574                                                           "space required after that '$op' $at\n" . $hereptr)) {
4575                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
4576                                                         $line_fixed = 1;
4577                                                 }
4578                                         }
4579
4580                                 # // is a comment
4581                                 } elsif ($op eq '//') {
4582
4583                                 #   :   when part of a bitfield
4584                                 } elsif ($opv eq ':B') {
4585                                         # skip the bitfield test for now
4586
4587                                 # No spaces for:
4588                                 #   ->
4589                                 } elsif ($op eq '->') {
4590                                         if ($ctx =~ /Wx.|.xW/) {
4591                                                 if (ERROR("SPACING",
4592                                                           "spaces prohibited around that '$op' $at\n" . $hereptr)) {
4593                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
4594                                                         if (defined $fix_elements[$n + 2]) {
4595                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
4596                                                         }
4597                                                         $line_fixed = 1;
4598                                                 }
4599                                         }
4600
4601                                 # , must not have a space before and must have a space on the right.
4602                                 } elsif ($op eq ',') {
4603                                         my $rtrim_before = 0;
4604                                         my $space_after = 0;
4605                                         if ($ctx =~ /Wx./) {
4606                                                 if (ERROR("SPACING",
4607                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
4608                                                         $line_fixed = 1;
4609                                                         $rtrim_before = 1;
4610                                                 }
4611                                         }
4612                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
4613                                                 if (ERROR("SPACING",
4614                                                           "space required after that '$op' $at\n" . $hereptr)) {
4615                                                         $line_fixed = 1;
4616                                                         $last_after = $n;
4617                                                         $space_after = 1;
4618                                                 }
4619                                         }
4620                                         if ($rtrim_before || $space_after) {
4621                                                 if ($rtrim_before) {
4622                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
4623                                                 } else {
4624                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
4625                                                 }
4626                                                 if ($space_after) {
4627                                                         $good .= " ";
4628                                                 }
4629                                         }
4630
4631                                 # '*' as part of a type definition -- reported already.
4632                                 } elsif ($opv eq '*_') {
4633                                         #warn "'*' is part of type\n";
4634
4635                                 # unary operators should have a space before and
4636                                 # none after.  May be left adjacent to another
4637                                 # unary operator, or a cast
4638                                 } elsif ($op eq '!' || $op eq '~' ||
4639                                          $opv eq '*U' || $opv eq '-U' ||
4640                                          $opv eq '&U' || $opv eq '&&U') {
4641                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
4642                                                 if (ERROR("SPACING",
4643                                                           "space required before that '$op' $at\n" . $hereptr)) {
4644                                                         if ($n != $last_after + 2) {
4645                                                                 $good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
4646                                                                 $line_fixed = 1;
4647                                                         }
4648                                                 }
4649                                         }
4650                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
4651                                                 # A unary '*' may be const
4652
4653                                         } elsif ($ctx =~ /.xW/) {
4654                                                 if (ERROR("SPACING",
4655                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
4656                                                         $good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
4657                                                         if (defined $fix_elements[$n + 2]) {
4658                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
4659                                                         }
4660                                                         $line_fixed = 1;
4661                                                 }
4662                                         }
4663
4664                                 # unary ++ and unary -- are allowed no space on one side.
4665                                 } elsif ($op eq '++' or $op eq '--') {
4666                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
4667                                                 if (ERROR("SPACING",
4668                                                           "space required one side of that '$op' $at\n" . $hereptr)) {
4669                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
4670                                                         $line_fixed = 1;
4671                                                 }
4672                                         }
4673                                         if ($ctx =~ /Wx[BE]/ ||
4674                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
4675                                                 if (ERROR("SPACING",
4676                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
4677                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
4678                                                         $line_fixed = 1;
4679                                                 }
4680                                         }
4681                                         if ($ctx =~ /ExW/) {
4682                                                 if (ERROR("SPACING",
4683                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
4684                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
4685                                                         if (defined $fix_elements[$n + 2]) {
4686                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
4687                                                         }
4688                                                         $line_fixed = 1;
4689                                                 }
4690                                         }
4691
4692                                 # << and >> may either have or not have spaces both sides
4693                                 } elsif ($op eq '<<' or $op eq '>>' or
4694                                          $op eq '&' or $op eq '^' or $op eq '|' or
4695                                          $op eq '+' or $op eq '-' or
4696                                          $op eq '*' or $op eq '/' or
4697                                          $op eq '%')
4698                                 {
4699                                         if ($check) {
4700                                                 if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
4701                                                         if (CHK("SPACING",
4702                                                                 "spaces preferred around that '$op' $at\n" . $hereptr)) {
4703                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
4704                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
4705                                                                 $line_fixed = 1;
4706                                                         }
4707                                                 } elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) {
4708                                                         if (CHK("SPACING",
4709                                                                 "space preferred before that '$op' $at\n" . $hereptr)) {
4710                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]);
4711                                                                 $line_fixed = 1;
4712                                                         }
4713                                                 }
4714                                         } elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
4715                                                 if (ERROR("SPACING",
4716                                                           "need consistent spacing around '$op' $at\n" . $hereptr)) {
4717                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
4718                                                         if (defined $fix_elements[$n + 2]) {
4719                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
4720                                                         }
4721                                                         $line_fixed = 1;
4722                                                 }
4723                                         }
4724
4725                                 # A colon needs no spaces before when it is
4726                                 # terminating a case value or a label.
4727                                 } elsif ($opv eq ':C' || $opv eq ':L') {
4728                                         if ($ctx =~ /Wx./) {
4729                                                 if (ERROR("SPACING",
4730                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
4731                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
4732                                                         $line_fixed = 1;
4733                                                 }
4734                                         }
4735
4736                                 # All the others need spaces both sides.
4737                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
4738                                         my $ok = 0;
4739
4740                                         # Ignore email addresses <foo@bar>
4741                                         if (($op eq '<' &&
4742                                              $cc =~ /^\S+\@\S+>/) ||
4743                                             ($op eq '>' &&
4744                                              $ca =~ /<\S+\@\S+$/))
4745                                         {
4746                                                 $ok = 1;
4747                                         }
4748
4749                                         # for asm volatile statements
4750                                         # ignore a colon with another
4751                                         # colon immediately before or after
4752                                         if (($op eq ':') &&
4753                                             ($ca =~ /:$/ || $cc =~ /^:/)) {
4754                                                 $ok = 1;
4755                                         }
4756
4757                                         # messages are ERROR, but ?: are CHK
4758                                         if ($ok == 0) {
4759                                                 my $msg_level = \&ERROR;
4760                                                 $msg_level = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);
4761
4762                                                 if (&{$msg_level}("SPACING",
4763                                                                   "spaces required around that '$op' $at\n" . $hereptr)) {
4764                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
4765                                                         if (defined $fix_elements[$n + 2]) {
4766                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
4767                                                         }
4768                                                         $line_fixed = 1;
4769                                                 }
4770                                         }
4771                                 }
4772                                 $off += length($elements[$n + 1]);
4773
4774 ##                              print("n: <$n> GOOD: <$good>\n");
4775
4776                                 $fixed_line = $fixed_line . $good;
4777                         }
4778
4779                         if (($#elements % 2) == 0) {
4780                                 $fixed_line = $fixed_line . $fix_elements[$#elements];
4781                         }
4782
4783                         if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) {
4784                                 $fixed[$fixlinenr] = $fixed_line;
4785                         }
4786
4787
4788                 }
4789
4790 # check for whitespace before a non-naked semicolon
4791                 if ($line =~ /^\+.*\S\s+;\s*$/) {
4792                         if (WARN("SPACING",
4793                                  "space prohibited before semicolon\n" . $herecurr) &&
4794                             $fix) {
4795                                 1 while $fixed[$fixlinenr] =~
4796                                     s/^(\+.*\S)\s+;/$1;/;
4797                         }
4798                 }
4799
4800 # check for multiple assignments
4801                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
4802                         CHK("MULTIPLE_ASSIGNMENTS",
4803                             "multiple assignments should be avoided\n" . $herecurr);
4804                 }
4805
4806 ## # check for multiple declarations, allowing for a function declaration
4807 ## # continuation.
4808 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
4809 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
4810 ##
4811 ##                      # Remove any bracketed sections to ensure we do not
4812 ##                      # falsly report the parameters of functions.
4813 ##                      my $ln = $line;
4814 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
4815 ##                      }
4816 ##                      if ($ln =~ /,/) {
4817 ##                              WARN("MULTIPLE_DECLARATION",
4818 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
4819 ##                      }
4820 ##              }
4821
4822 #need space before brace following if, while, etc
4823                 if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
4824                     $line =~ /\b(?:else|do)\{/) {
4825                         if (ERROR("SPACING",
4826                                   "space required before the open brace '{'\n" . $herecurr) &&
4827                             $fix) {
4828                                 $fixed[$fixlinenr] =~ s/^(\+.*(?:do|else|\)))\{/$1 {/;
4829                         }
4830                 }
4831
4832 ## # check for blank lines before declarations
4833 ##              if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
4834 ##                  $prevrawline =~ /^.\s*$/) {
4835 ##                      WARN("SPACING",
4836 ##                           "No blank lines before declarations\n" . $hereprev);
4837 ##              }
4838 ##
4839
4840 # closing brace should have a space following it when it has anything
4841 # on the line
4842                 if ($line =~ /}(?!(?:,|;|\)|\}))\S/) {
4843                         if (ERROR("SPACING",
4844                                   "space required after that close brace '}'\n" . $herecurr) &&
4845                             $fix) {
4846                                 $fixed[$fixlinenr] =~
4847                                     s/}((?!(?:,|;|\)))\S)/} $1/;
4848                         }
4849                 }
4850
4851 # check spacing on square brackets
4852                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
4853                         if (ERROR("SPACING",
4854                                   "space prohibited after that open square bracket '['\n" . $herecurr) &&
4855                             $fix) {
4856                                 $fixed[$fixlinenr] =~
4857                                     s/\[\s+/\[/;
4858                         }
4859                 }
4860                 if ($line =~ /\s\]/) {
4861                         if (ERROR("SPACING",
4862                                   "space prohibited before that close square bracket ']'\n" . $herecurr) &&
4863                             $fix) {
4864                                 $fixed[$fixlinenr] =~
4865                                     s/\s+\]/\]/;
4866                         }
4867                 }
4868
4869 # check spacing on parentheses
4870                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
4871                     $line !~ /for\s*\(\s+;/) {
4872                         if (ERROR("SPACING",
4873                                   "space prohibited after that open parenthesis '('\n" . $herecurr) &&
4874                             $fix) {
4875                                 $fixed[$fixlinenr] =~
4876                                     s/\(\s+/\(/;
4877                         }
4878                 }
4879                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
4880                     $line !~ /for\s*\(.*;\s+\)/ &&
4881                     $line !~ /:\s+\)/) {
4882                         if (ERROR("SPACING",
4883                                   "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
4884                             $fix) {
4885                                 $fixed[$fixlinenr] =~
4886                                     s/\s+\)/\)/;
4887                         }
4888                 }
4889
4890 # check unnecessary parentheses around addressof/dereference single $Lvals
4891 # ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar
4892
4893                 while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
4894                         my $var = $1;
4895                         if (CHK("UNNECESSARY_PARENTHESES",
4896                                 "Unnecessary parentheses around $var\n" . $herecurr) &&
4897                             $fix) {
4898                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/;
4899                         }
4900                 }
4901
4902 # check for unnecessary parentheses around function pointer uses
4903 # ie: (foo->bar)(); should be foo->bar();
4904 # but not "if (foo->bar) (" to avoid some false positives
4905                 if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) {
4906                         my $var = $2;
4907                         if (CHK("UNNECESSARY_PARENTHESES",
4908                                 "Unnecessary parentheses around function pointer $var\n" . $herecurr) &&
4909                             $fix) {
4910                                 my $var2 = deparenthesize($var);
4911                                 $var2 =~ s/\s//g;
4912                                 $fixed[$fixlinenr] =~ s/\Q$var\E/$var2/;
4913                         }
4914                 }
4915
4916 # check for unnecessary parentheses around comparisons in if uses
4917 # when !drivers/staging or command-line uses --strict
4918                 if (($realfile !~ m@^(?:drivers/staging/)@ || $check_orig) &&
4919                     $perl_version_ok && defined($stat) &&
4920                     $stat =~ /(^.\s*if\s*($balanced_parens))/) {
4921                         my $if_stat = $1;
4922                         my $test = substr($2, 1, -1);
4923                         my $herectx;
4924                         while ($test =~ /(?:^|[^\w\&\!\~])+\s*\(\s*([\&\!\~]?\s*$Lval\s*(?:$Compare\s*$FuncArg)?)\s*\)/g) {
4925                                 my $match = $1;
4926                                 # avoid parentheses around potential macro args
4927                                 next if ($match =~ /^\s*\w+\s*$/);
4928                                 if (!defined($herectx)) {
4929                                         $herectx = $here . "\n";
4930                                         my $cnt = statement_rawlines($if_stat);
4931                                         for (my $n = 0; $n < $cnt; $n++) {
4932                                                 my $rl = raw_line($linenr, $n);
4933                                                 $herectx .=  $rl . "\n";
4934                                                 last if $rl =~ /^[ \+].*\{/;
4935                                         }
4936                                 }
4937                                 CHK("UNNECESSARY_PARENTHESES",
4938                                     "Unnecessary parentheses around '$match'\n" . $herectx);
4939                         }
4940                 }
4941
4942 #goto labels aren't indented, allow a single space however
4943                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
4944                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
4945                         if (WARN("INDENTED_LABEL",
4946                                  "labels should not be indented\n" . $herecurr) &&
4947                             $fix) {
4948                                 $fixed[$fixlinenr] =~
4949                                     s/^(.)\s+/$1/;
4950                         }
4951                 }
4952
4953 # return is not a function
4954                 if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
4955                         my $spacing = $1;
4956                         if ($perl_version_ok &&
4957                             $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
4958                                 my $value = $1;
4959                                 $value = deparenthesize($value);
4960                                 if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
4961                                         ERROR("RETURN_PARENTHESES",
4962                                               "return is not a function, parentheses are not required\n" . $herecurr);
4963                                 }
4964                         } elsif ($spacing !~ /\s+/) {
4965                                 ERROR("SPACING",
4966                                       "space required before the open parenthesis '('\n" . $herecurr);
4967                         }
4968                 }
4969
4970 # unnecessary return in a void function
4971 # at end-of-function, with the previous line a single leading tab, then return;
4972 # and the line before that not a goto label target like "out:"
4973                 if ($sline =~ /^[ \+]}\s*$/ &&
4974                     $prevline =~ /^\+\treturn\s*;\s*$/ &&
4975                     $linenr >= 3 &&
4976                     $lines[$linenr - 3] =~ /^[ +]/ &&
4977                     $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
4978                         WARN("RETURN_VOID",
4979                              "void function return statements are not generally useful\n" . $hereprev);
4980                }
4981
4982 # if statements using unnecessary parentheses - ie: if ((foo == bar))
4983                 if ($perl_version_ok &&
4984                     $line =~ /\bif\s*((?:\(\s*){2,})/) {
4985                         my $openparens = $1;
4986                         my $count = $openparens =~ tr@\(@\(@;
4987                         my $msg = "";
4988                         if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
4989                                 my $comp = $4;  #Not $1 because of $LvalOrFunc
4990                                 $msg = " - maybe == should be = ?" if ($comp eq "==");
4991                                 WARN("UNNECESSARY_PARENTHESES",
4992                                      "Unnecessary parentheses$msg\n" . $herecurr);
4993                         }
4994                 }
4995
4996 # comparisons with a constant or upper case identifier on the left
4997 #       avoid cases like "foo + BAR < baz"
4998 #       only fix matches surrounded by parentheses to avoid incorrect
4999 #       conversions like "FOO < baz() + 5" being "misfixed" to "baz() > FOO + 5"
5000                 if ($perl_version_ok &&
5001                     $line =~ /^\+(.*)\b($Constant|[A-Z_][A-Z0-9_]*)\s*($Compare)\s*($LvalOrFunc)/) {
5002                         my $lead = $1;
5003                         my $const = $2;
5004                         my $comp = $3;
5005                         my $to = $4;
5006                         my $newcomp = $comp;
5007                         if ($lead !~ /(?:$Operators|\.)\s*$/ &&
5008                             $to !~ /^(?:Constant|[A-Z_][A-Z0-9_]*)$/ &&
5009                             WARN("CONSTANT_COMPARISON",
5010                                  "Comparisons should place the constant on the right side of the test\n" . $herecurr) &&
5011                             $fix) {
5012                                 if ($comp eq "<") {
5013                                         $newcomp = ">";
5014                                 } elsif ($comp eq "<=") {
5015                                         $newcomp = ">=";
5016                                 } elsif ($comp eq ">") {
5017                                         $newcomp = "<";
5018                                 } elsif ($comp eq ">=") {
5019                                         $newcomp = "<=";
5020                                 }
5021                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$const\E\s*$Compare\s*\Q$to\E\s*\)/($to $newcomp $const)/;
5022                         }
5023                 }
5024
5025 # Return of what appears to be an errno should normally be negative
5026                 if ($sline =~ /\breturn(?:\s*\(+\s*|\s+)(E[A-Z]+)(?:\s*\)+\s*|\s*)[;:,]/) {
5027                         my $name = $1;
5028                         if ($name ne 'EOF' && $name ne 'ERROR') {
5029                                 WARN("USE_NEGATIVE_ERRNO",
5030                                      "return of an errno should typically be negative (ie: return -$1)\n" . $herecurr);
5031                         }
5032                 }
5033
5034 # Need a space before open parenthesis after if, while etc
5035                 if ($line =~ /\b(if|while|for|switch)\(/) {
5036                         if (ERROR("SPACING",
5037                                   "space required before the open parenthesis '('\n" . $herecurr) &&
5038                             $fix) {
5039                                 $fixed[$fixlinenr] =~
5040                                     s/\b(if|while|for|switch)\(/$1 \(/;
5041                         }
5042                 }
5043
5044 # Check for illegal assignment in if conditional -- and check for trailing
5045 # statements after the conditional.
5046                 if ($line =~ /do\s*(?!{)/) {
5047                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
5048                                 ctx_statement_block($linenr, $realcnt, 0)
5049                                         if (!defined $stat);
5050                         my ($stat_next) = ctx_statement_block($line_nr_next,
5051                                                 $remain_next, $off_next);
5052                         $stat_next =~ s/\n./\n /g;
5053                         ##print "stat<$stat> stat_next<$stat_next>\n";
5054
5055                         if ($stat_next =~ /^\s*while\b/) {
5056                                 # If the statement carries leading newlines,
5057                                 # then count those as offsets.
5058                                 my ($whitespace) =
5059                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
5060                                 my $offset =
5061                                         statement_rawlines($whitespace) - 1;
5062
5063                                 $suppress_whiletrailers{$line_nr_next +
5064                                                                 $offset} = 1;
5065                         }
5066                 }
5067                 if (!defined $suppress_whiletrailers{$linenr} &&
5068                     defined($stat) && defined($cond) &&
5069                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
5070                         my ($s, $c) = ($stat, $cond);
5071
5072                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
5073                                 ERROR("ASSIGN_IN_IF",
5074                                       "do not use assignment in if condition\n" . $herecurr);
5075                         }
5076
5077                         # Find out what is on the end of the line after the
5078                         # conditional.
5079                         substr($s, 0, length($c), '');
5080                         $s =~ s/\n.*//g;
5081                         $s =~ s/$;//g;  # Remove any comments
5082                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
5083                             $c !~ /}\s*while\s*/)
5084                         {
5085                                 # Find out how long the conditional actually is.
5086                                 my @newlines = ($c =~ /\n/gs);
5087                                 my $cond_lines = 1 + $#newlines;
5088                                 my $stat_real = '';
5089
5090                                 $stat_real = raw_line($linenr, $cond_lines)
5091                                                         . "\n" if ($cond_lines);
5092                                 if (defined($stat_real) && $cond_lines > 1) {
5093                                         $stat_real = "[...]\n$stat_real";
5094                                 }
5095
5096                                 ERROR("TRAILING_STATEMENTS",
5097                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
5098                         }
5099                 }
5100
5101 # Check for bitwise tests written as boolean
5102                 if ($line =~ /
5103                         (?:
5104                                 (?:\[|\(|\&\&|\|\|)
5105                                 \s*0[xX][0-9]+\s*
5106                                 (?:\&\&|\|\|)
5107                         |
5108                                 (?:\&\&|\|\|)
5109                                 \s*0[xX][0-9]+\s*
5110                                 (?:\&\&|\|\||\)|\])
5111                         )/x)
5112                 {
5113                         WARN("HEXADECIMAL_BOOLEAN_TEST",
5114                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
5115                 }
5116
5117 # if and else should not have general statements after it
5118                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
5119                         my $s = $1;
5120                         $s =~ s/$;//g;  # Remove any comments
5121                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
5122                                 ERROR("TRAILING_STATEMENTS",
5123                                       "trailing statements should be on next line\n" . $herecurr);
5124                         }
5125                 }
5126 # if should not continue a brace
5127                 if ($line =~ /}\s*if\b/) {
5128                         ERROR("TRAILING_STATEMENTS",
5129                               "trailing statements should be on next line (or did you mean 'else if'?)\n" .
5130                                 $herecurr);
5131                 }
5132 # case and default should not have general statements after them
5133                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
5134                     $line !~ /\G(?:
5135                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
5136                         \s*return\s+
5137                     )/xg)
5138                 {
5139                         ERROR("TRAILING_STATEMENTS",
5140                               "trailing statements should be on next line\n" . $herecurr);
5141                 }
5142
5143                 # Check for }<nl>else {, these must be at the same
5144                 # indent level to be relevant to each other.
5145                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ &&
5146                     $previndent == $indent) {
5147                         if (ERROR("ELSE_AFTER_BRACE",
5148                                   "else should follow close brace '}'\n" . $hereprev) &&
5149                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
5150                                 fix_delete_line($fixlinenr - 1, $prevrawline);
5151                                 fix_delete_line($fixlinenr, $rawline);
5152                                 my $fixedline = $prevrawline;
5153                                 $fixedline =~ s/}\s*$//;
5154                                 if ($fixedline !~ /^\+\s*$/) {
5155                                         fix_insert_line($fixlinenr, $fixedline);
5156                                 }
5157                                 $fixedline = $rawline;
5158                                 $fixedline =~ s/^(.\s*)else/$1} else/;
5159                                 fix_insert_line($fixlinenr, $fixedline);
5160                         }
5161                 }
5162
5163                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ &&
5164                     $previndent == $indent) {
5165                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
5166
5167                         # Find out what is on the end of the line after the
5168                         # conditional.
5169                         substr($s, 0, length($c), '');
5170                         $s =~ s/\n.*//g;
5171
5172                         if ($s =~ /^\s*;/) {
5173                                 if (ERROR("WHILE_AFTER_BRACE",
5174                                           "while should follow close brace '}'\n" . $hereprev) &&
5175                                     $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
5176                                         fix_delete_line($fixlinenr - 1, $prevrawline);
5177                                         fix_delete_line($fixlinenr, $rawline);
5178                                         my $fixedline = $prevrawline;
5179                                         my $trailing = $rawline;
5180                                         $trailing =~ s/^\+//;
5181                                         $trailing = trim($trailing);
5182                                         $fixedline =~ s/}\s*$/} $trailing/;
5183                                         fix_insert_line($fixlinenr, $fixedline);
5184                                 }
5185                         }
5186                 }
5187
5188 #Specific variable tests
5189                 while ($line =~ m{($Constant|$Lval)}g) {
5190                         my $var = $1;
5191
5192 #CamelCase
5193                         if ($var !~ /^$Constant$/ &&
5194                             $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
5195 #Ignore Page<foo> variants
5196                             $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
5197 #Ignore SI style variants like nS, mV and dB
5198 #(ie: max_uV, regulator_min_uA_show, RANGE_mA_VALUE)
5199                             $var !~ /^(?:[a-z0-9_]*|[A-Z0-9_]*)?_?[a-z][A-Z](?:_[a-z0-9_]+|_[A-Z0-9_]+)?$/ &&
5200 #Ignore some three character SI units explicitly, like MiB and KHz
5201                             $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
5202                                 while ($var =~ m{($Ident)}g) {
5203                                         my $word = $1;
5204                                         next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
5205                                         if ($check) {
5206                                                 seed_camelcase_includes();
5207                                                 if (!$file && !$camelcase_file_seeded) {
5208                                                         seed_camelcase_file($realfile);
5209                                                         $camelcase_file_seeded = 1;
5210                                                 }
5211                                         }
5212                                         if (!defined $camelcase{$word}) {
5213                                                 $camelcase{$word} = 1;
5214                                                 CHK("CAMELCASE",
5215                                                     "Avoid CamelCase: <$word>\n" . $herecurr);
5216                                         }
5217                                 }
5218                         }
5219                 }
5220
5221 #no spaces allowed after \ in define
5222                 if ($line =~ /\#\s*define.*\\\s+$/) {
5223                         if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
5224                                  "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
5225                             $fix) {
5226                                 $fixed[$fixlinenr] =~ s/\s+$//;
5227                         }
5228                 }
5229
5230 # warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes
5231 # itself <asm/foo.h> (uses RAW line)
5232                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
5233                         my $file = "$1.h";
5234                         my $checkfile = "include/linux/$file";
5235                         if (-f "$root/$checkfile" &&
5236                             $realfile ne $checkfile &&
5237                             $1 !~ /$allowed_asm_includes/)
5238                         {
5239                                 my $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`;
5240                                 if ($asminclude > 0) {
5241                                         if ($realfile =~ m{^arch/}) {
5242                                                 CHK("ARCH_INCLUDE_LINUX",
5243                                                     "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
5244                                         } else {
5245                                                 WARN("INCLUDE_LINUX",
5246                                                      "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
5247                                         }
5248                                 }
5249                         }
5250                 }
5251
5252 # multi-statement macros should be enclosed in a do while loop, grab the
5253 # first statement and ensure its the whole macro if its not enclosed
5254 # in a known good container
5255                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
5256                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
5257                         my $ln = $linenr;
5258                         my $cnt = $realcnt;
5259                         my ($off, $dstat, $dcond, $rest);
5260                         my $ctx = '';
5261                         my $has_flow_statement = 0;
5262                         my $has_arg_concat = 0;
5263                         ($dstat, $dcond, $ln, $cnt, $off) =
5264                                 ctx_statement_block($linenr, $realcnt, 0);
5265                         $ctx = $dstat;
5266                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
5267                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
5268
5269                         $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
5270                         $has_arg_concat = 1 if ($ctx =~ /\#\#/ && $ctx !~ /\#\#\s*(?:__VA_ARGS__|args)\b/);
5271
5272                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(\([^\)]*\))?\s*//;
5273                         my $define_args = $1;
5274                         my $define_stmt = $dstat;
5275                         my @def_args = ();
5276
5277                         if (defined $define_args && $define_args ne "") {
5278                                 $define_args = substr($define_args, 1, length($define_args) - 2);
5279                                 $define_args =~ s/\s*//g;
5280                                 $define_args =~ s/\\\+?//g;
5281                                 @def_args = split(",", $define_args);
5282                         }
5283
5284                         $dstat =~ s/$;//g;
5285                         $dstat =~ s/\\\n.//g;
5286                         $dstat =~ s/^\s*//s;
5287                         $dstat =~ s/\s*$//s;
5288
5289                         # Flatten any parentheses and braces
5290                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
5291                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
5292                                $dstat =~ s/.\[[^\[\]]*\]/1/)
5293                         {
5294                         }
5295
5296                         # Flatten any obvious string concatenation.
5297                         while ($dstat =~ s/($String)\s*$Ident/$1/ ||
5298                                $dstat =~ s/$Ident\s*($String)/$1/)
5299                         {
5300                         }
5301
5302                         # Make asm volatile uses seem like a generic function
5303                         $dstat =~ s/\b_*asm_*\s+_*volatile_*\b/asm_volatile/g;
5304
5305                         my $exceptions = qr{
5306                                 $Declare|
5307                                 module_param_named|
5308                                 MODULE_PARM_DESC|
5309                                 DECLARE_PER_CPU|
5310                                 DEFINE_PER_CPU|
5311                                 __typeof__\(|
5312                                 union|
5313                                 struct|
5314                                 \.$Ident\s*=\s*|
5315                                 ^\"|\"$|
5316                                 ^\[
5317                         }x;
5318                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
5319
5320                         $ctx =~ s/\n*$//;
5321                         my $stmt_cnt = statement_rawlines($ctx);
5322                         my $herectx = get_stat_here($linenr, $stmt_cnt, $here);
5323
5324                         if ($dstat ne '' &&
5325                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
5326                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
5327                             $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&          # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
5328                             $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ &&                  # character constants
5329                             $dstat !~ /$exceptions/ &&
5330                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
5331                             $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&          # stringification #foo
5332                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
5333                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
5334                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
5335                             $dstat !~ /^do\s*{/ &&                                      # do {...
5336                             $dstat !~ /^\(\{/ &&                                                # ({...
5337                             $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
5338                         {
5339                                 if ($dstat =~ /^\s*if\b/) {
5340                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
5341                                               "Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx");
5342                                 } elsif ($dstat =~ /;/) {
5343                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
5344                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
5345                                 } else {
5346                                         ERROR("COMPLEX_MACRO",
5347                                               "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
5348                                 }
5349
5350                         }
5351
5352                         # Make $define_stmt single line, comment-free, etc
5353                         my @stmt_array = split('\n', $define_stmt);
5354                         my $first = 1;
5355                         $define_stmt = "";
5356                         foreach my $l (@stmt_array) {
5357                                 $l =~ s/\\$//;
5358                                 if ($first) {
5359                                         $define_stmt = $l;
5360                                         $first = 0;
5361                                 } elsif ($l =~ /^[\+ ]/) {
5362                                         $define_stmt .= substr($l, 1);
5363                                 }
5364                         }
5365                         $define_stmt =~ s/$;//g;
5366                         $define_stmt =~ s/\s+/ /g;
5367                         $define_stmt = trim($define_stmt);
5368
5369 # check if any macro arguments are reused (ignore '...' and 'type')
5370                         foreach my $arg (@def_args) {
5371                                 next if ($arg =~ /\.\.\./);
5372                                 next if ($arg =~ /^type$/i);
5373                                 my $tmp_stmt = $define_stmt;
5374                                 $tmp_stmt =~ s/\b(sizeof|typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
5375                                 $tmp_stmt =~ s/\#+\s*$arg\b//g;
5376                                 $tmp_stmt =~ s/\b$arg\s*\#\#//g;
5377                                 my $use_cnt = () = $tmp_stmt =~ /\b$arg\b/g;
5378                                 if ($use_cnt > 1) {
5379                                         CHK("MACRO_ARG_REUSE",
5380                                             "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx");
5381                                     }
5382 # check if any macro arguments may have other precedence issues
5383                                 if ($tmp_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m &&
5384                                     ((defined($1) && $1 ne ',') ||
5385                                      (defined($2) && $2 ne ','))) {
5386                                         CHK("MACRO_ARG_PRECEDENCE",
5387                                             "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx");
5388                                 }
5389                         }
5390
5391 # check for macros with flow control, but without ## concatenation
5392 # ## concatenation is commonly a macro that defines a function so ignore those
5393                         if ($has_flow_statement && !$has_arg_concat) {
5394                                 my $cnt = statement_rawlines($ctx);
5395                                 my $herectx = get_stat_here($linenr, $cnt, $here);
5396
5397                                 WARN("MACRO_WITH_FLOW_CONTROL",
5398                                      "Macros with flow control statements should be avoided\n" . "$herectx");
5399                         }
5400
5401 # check for line continuations outside of #defines, preprocessor #, and asm
5402
5403                 } else {
5404                         if ($prevline !~ /^..*\\$/ &&
5405                             $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
5406                             $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
5407                             $line =~ /^\+.*\\$/) {
5408                                 WARN("LINE_CONTINUATIONS",
5409                                      "Avoid unnecessary line continuations\n" . $herecurr);
5410                         }
5411                 }
5412
5413 # do {} while (0) macro tests:
5414 # single-statement macros do not need to be enclosed in do while (0) loop,
5415 # macro should not end with a semicolon
5416                 if ($perl_version_ok &&
5417                     $realfile !~ m@/vmlinux.lds.h$@ &&
5418                     $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
5419                         my $ln = $linenr;
5420                         my $cnt = $realcnt;
5421                         my ($off, $dstat, $dcond, $rest);
5422                         my $ctx = '';
5423                         ($dstat, $dcond, $ln, $cnt, $off) =
5424                                 ctx_statement_block($linenr, $realcnt, 0);
5425                         $ctx = $dstat;
5426
5427                         $dstat =~ s/\\\n.//g;
5428                         $dstat =~ s/$;/ /g;
5429
5430                         if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
5431                                 my $stmts = $2;
5432                                 my $semis = $3;
5433
5434                                 $ctx =~ s/\n*$//;
5435                                 my $cnt = statement_rawlines($ctx);
5436                                 my $herectx = get_stat_here($linenr, $cnt, $here);
5437
5438                                 if (($stmts =~ tr/;/;/) == 1 &&
5439                                     $stmts !~ /^\s*(if|while|for|switch)\b/) {
5440                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
5441                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
5442                                 }
5443                                 if (defined $semis && $semis ne "") {
5444                                         WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
5445                                              "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
5446                                 }
5447                         } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
5448                                 $ctx =~ s/\n*$//;
5449                                 my $cnt = statement_rawlines($ctx);
5450                                 my $herectx = get_stat_here($linenr, $cnt, $here);
5451
5452                                 WARN("TRAILING_SEMICOLON",
5453                                      "macros should not use a trailing semicolon\n" . "$herectx");
5454                         }
5455                 }
5456
5457 # check for redundant bracing round if etc
5458                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
5459                         my ($level, $endln, @chunks) =
5460                                 ctx_statement_full($linenr, $realcnt, 1);
5461                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
5462                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
5463                         if ($#chunks > 0 && $level == 0) {
5464                                 my @allowed = ();
5465                                 my $allow = 0;
5466                                 my $seen = 0;
5467                                 my $herectx = $here . "\n";
5468                                 my $ln = $linenr - 1;
5469                                 for my $chunk (@chunks) {
5470                                         my ($cond, $block) = @{$chunk};
5471
5472                                         # If the condition carries leading newlines, then count those as offsets.
5473                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
5474                                         my $offset = statement_rawlines($whitespace) - 1;
5475
5476                                         $allowed[$allow] = 0;
5477                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
5478
5479                                         # We have looked at and allowed this specific line.
5480                                         $suppress_ifbraces{$ln + $offset} = 1;
5481
5482                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
5483                                         $ln += statement_rawlines($block) - 1;
5484
5485                                         substr($block, 0, length($cond), '');
5486
5487                                         $seen++ if ($block =~ /^\s*{/);
5488
5489                                         #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
5490                                         if (statement_lines($cond) > 1) {
5491                                                 #print "APW: ALLOWED: cond<$cond>\n";
5492                                                 $allowed[$allow] = 1;
5493                                         }
5494                                         if ($block =~/\b(?:if|for|while)\b/) {
5495                                                 #print "APW: ALLOWED: block<$block>\n";
5496                                                 $allowed[$allow] = 1;
5497                                         }
5498                                         if (statement_block_size($block) > 1) {
5499                                                 #print "APW: ALLOWED: lines block<$block>\n";
5500                                                 $allowed[$allow] = 1;
5501                                         }
5502                                         $allow++;
5503                                 }
5504                                 if ($seen) {
5505                                         my $sum_allowed = 0;
5506                                         foreach (@allowed) {
5507                                                 $sum_allowed += $_;
5508                                         }
5509                                         if ($sum_allowed == 0) {
5510                                                 WARN("BRACES",
5511                                                      "braces {} are not necessary for any arm of this statement\n" . $herectx);
5512                                         } elsif ($sum_allowed != $allow &&
5513                                                  $seen != $allow) {
5514                                                 CHK("BRACES",
5515                                                     "braces {} should be used on all arms of this statement\n" . $herectx);
5516                                         }
5517                                 }
5518                         }
5519                 }
5520                 if (!defined $suppress_ifbraces{$linenr - 1} &&
5521                                         $line =~ /\b(if|while|for|else)\b/) {
5522                         my $allowed = 0;
5523
5524                         # Check the pre-context.
5525                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
5526                                 #print "APW: ALLOWED: pre<$1>\n";
5527                                 $allowed = 1;
5528                         }
5529
5530                         my ($level, $endln, @chunks) =
5531                                 ctx_statement_full($linenr, $realcnt, $-[0]);
5532
5533                         # Check the condition.
5534                         my ($cond, $block) = @{$chunks[0]};
5535                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
5536                         if (defined $cond) {
5537                                 substr($block, 0, length($cond), '');
5538                         }
5539                         if (statement_lines($cond) > 1) {
5540                                 #print "APW: ALLOWED: cond<$cond>\n";
5541                                 $allowed = 1;
5542                         }
5543                         if ($block =~/\b(?:if|for|while)\b/) {
5544                                 #print "APW: ALLOWED: block<$block>\n";
5545                                 $allowed = 1;
5546                         }
5547                         if (statement_block_size($block) > 1) {
5548                                 #print "APW: ALLOWED: lines block<$block>\n";
5549                                 $allowed = 1;
5550                         }
5551                         # Check the post-context.
5552                         if (defined $chunks[1]) {
5553                                 my ($cond, $block) = @{$chunks[1]};
5554                                 if (defined $cond) {
5555                                         substr($block, 0, length($cond), '');
5556                                 }
5557                                 if ($block =~ /^\s*\{/) {
5558                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
5559                                         $allowed = 1;
5560                                 }
5561                         }
5562                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
5563                                 my $cnt = statement_rawlines($block);
5564                                 my $herectx = get_stat_here($linenr, $cnt, $here);
5565
5566                                 WARN("BRACES",
5567                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
5568                         }
5569                 }
5570
5571 # check for single line unbalanced braces
5572                 if ($sline =~ /^.\s*\}\s*else\s*$/ ||
5573                     $sline =~ /^.\s*else\s*\{\s*$/) {
5574                         CHK("BRACES", "Unbalanced braces around else statement\n" . $herecurr);
5575                 }
5576
5577 # check for unnecessary blank lines around braces
5578                 if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
5579                         if (CHK("BRACES",
5580                                 "Blank lines aren't necessary before a close brace '}'\n" . $hereprev) &&
5581                             $fix && $prevrawline =~ /^\+/) {
5582                                 fix_delete_line($fixlinenr - 1, $prevrawline);
5583                         }
5584                 }
5585                 if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
5586                         if (CHK("BRACES",
5587                                 "Blank lines aren't necessary after an open brace '{'\n" . $hereprev) &&
5588                             $fix) {
5589                                 fix_delete_line($fixlinenr, $rawline);
5590                         }
5591                 }
5592
5593 # no volatiles please
5594                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
5595                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
5596                         WARN("VOLATILE",
5597                              "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr);
5598                 }
5599
5600 # Check for user-visible strings broken across lines, which breaks the ability
5601 # to grep for the string.  Make exceptions when the previous string ends in a
5602 # newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
5603 # (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
5604                 if ($line =~ /^\+\s*$String/ &&
5605                     $prevline =~ /"\s*$/ &&
5606                     $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
5607                         if (WARN("SPLIT_STRING",
5608                                  "quoted string split across lines\n" . $hereprev) &&
5609                                      $fix &&
5610                                      $prevrawline =~ /^\+.*"\s*$/ &&
5611                                      $last_coalesced_string_linenr != $linenr - 1) {
5612                                 my $extracted_string = get_quoted_string($line, $rawline);
5613                                 my $comma_close = "";
5614                                 if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
5615                                         $comma_close = $1;
5616                                 }
5617
5618                                 fix_delete_line($fixlinenr - 1, $prevrawline);
5619                                 fix_delete_line($fixlinenr, $rawline);
5620                                 my $fixedline = $prevrawline;
5621                                 $fixedline =~ s/"\s*$//;
5622                                 $fixedline .= substr($extracted_string, 1) . trim($comma_close);
5623                                 fix_insert_line($fixlinenr - 1, $fixedline);
5624                                 $fixedline = $rawline;
5625                                 $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
5626                                 if ($fixedline !~ /\+\s*$/) {
5627                                         fix_insert_line($fixlinenr, $fixedline);
5628                                 }
5629                                 $last_coalesced_string_linenr = $linenr;
5630                         }
5631                 }
5632
5633 # check for missing a space in a string concatenation
5634                 if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
5635                         WARN('MISSING_SPACE',
5636                              "break quoted strings at a space character\n" . $hereprev);
5637                 }
5638
5639 # check for an embedded function name in a string when the function is known
5640 # This does not work very well for -f --file checking as it depends on patch
5641 # context providing the function name or a single line form for in-file
5642 # function declarations
5643                 if ($line =~ /^\+.*$String/ &&
5644                     defined($context_function) &&
5645                     get_quoted_string($line, $rawline) =~ /\b$context_function\b/ &&
5646                     length(get_quoted_string($line, $rawline)) != (length($context_function) + 2)) {
5647                         WARN("EMBEDDED_FUNCTION_NAME",
5648                              "Prefer using '\"%s...\", __func__' to using '$context_function', this function's name, in a string\n" . $herecurr);
5649                 }
5650
5651 # check for spaces before a quoted newline
5652                 if ($rawline =~ /^.*\".*\s\\n/) {
5653                         if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
5654                                  "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
5655                             $fix) {
5656                                 $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
5657                         }
5658
5659                 }
5660
5661 # concatenated string without spaces between elements
5662                 if ($line =~ /$String[A-Za-z0-9_]/ || $line =~ /[A-Za-z0-9_]$String/) {
5663                         if (CHK("CONCATENATED_STRING",
5664                                 "Concatenated strings should use spaces between elements\n" . $herecurr) &&
5665                             $fix) {
5666                                 while ($line =~ /($String)/g) {
5667                                         my $extracted_string = substr($rawline, $-[0], $+[0] - $-[0]);
5668                                         $fixed[$fixlinenr] =~ s/\Q$extracted_string\E([A-Za-z0-9_])/$extracted_string $1/;
5669                                         $fixed[$fixlinenr] =~ s/([A-Za-z0-9_])\Q$extracted_string\E/$1 $extracted_string/;
5670                                 }
5671                         }
5672                 }
5673
5674 # uncoalesced string fragments
5675                 if ($line =~ /$String\s*"/) {
5676                         if (WARN("STRING_FRAGMENTS",
5677                                  "Consecutive strings are generally better as a single string\n" . $herecurr) &&
5678                             $fix) {
5679                                 while ($line =~ /($String)(?=\s*")/g) {
5680                                         my $extracted_string = substr($rawline, $-[0], $+[0] - $-[0]);
5681                                         $fixed[$fixlinenr] =~ s/\Q$extracted_string\E\s*"/substr($extracted_string, 0, -1)/e;
5682                                 }
5683                         }
5684                 }
5685
5686 # check for non-standard and hex prefixed decimal printf formats
5687                 my $show_L = 1; #don't show the same defect twice
5688                 my $show_Z = 1;
5689                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
5690                         my $string = substr($rawline, $-[1], $+[1] - $-[1]);
5691                         $string =~ s/%%/__/g;
5692                         # check for %L
5693                         if ($show_L && $string =~ /%[\*\d\.\$]*L([diouxX])/) {
5694                                 WARN("PRINTF_L",
5695                                      "\%L$1 is non-standard C, use %ll$1\n" . $herecurr);
5696                                 $show_L = 0;
5697                         }
5698                         # check for %Z
5699                         if ($show_Z && $string =~ /%[\*\d\.\$]*Z([diouxX])/) {
5700                                 WARN("PRINTF_Z",
5701                                      "%Z$1 is non-standard C, use %z$1\n" . $herecurr);
5702                                 $show_Z = 0;
5703                         }
5704                         # check for 0x<decimal>
5705                         if ($string =~ /0x%[\*\d\.\$\Llzth]*[diou]/) {
5706                                 ERROR("PRINTF_0XDECIMAL",
5707                                       "Prefixing 0x with decimal output is defective\n" . $herecurr);
5708                         }
5709                 }
5710
5711 # check for line continuations in quoted strings with odd counts of "
5712                 if ($rawline =~ /\\$/ && $sline =~ tr/"/"/ % 2) {
5713                         WARN("LINE_CONTINUATIONS",
5714                              "Avoid line continuations in quoted strings\n" . $herecurr);
5715                 }
5716
5717 # warn about #if 0
5718                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
5719                         WARN("IF_0",
5720                              "Consider removing the code enclosed by this #if 0 and its #endif\n" . $herecurr);
5721                 }
5722
5723 # warn about #if 1
5724                 if ($line =~ /^.\s*\#\s*if\s+1\b/) {
5725                         WARN("IF_1",
5726                              "Consider removing the #if 1 and its #endif\n" . $herecurr);
5727                 }
5728
5729 # check for needless "if (<foo>) fn(<foo>)" uses
5730                 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
5731                         my $tested = quotemeta($1);
5732                         my $expr = '\s*\(\s*' . $tested . '\s*\)\s*;';
5733                         if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?|(?:kmem_cache|mempool|dma_pool)_destroy)$expr/) {
5734                                 my $func = $1;
5735                                 if (WARN('NEEDLESS_IF',
5736                                          "$func(NULL) is safe and this check is probably not required\n" . $hereprev) &&
5737                                     $fix) {
5738                                         my $do_fix = 1;
5739                                         my $leading_tabs = "";
5740                                         my $new_leading_tabs = "";
5741                                         if ($lines[$linenr - 2] =~ /^\+(\t*)if\s*\(\s*$tested\s*\)\s*$/) {
5742                                                 $leading_tabs = $1;
5743                                         } else {
5744                                                 $do_fix = 0;
5745                                         }
5746                                         if ($lines[$linenr - 1] =~ /^\+(\t+)$func\s*\(\s*$tested\s*\)\s*;\s*$/) {
5747                                                 $new_leading_tabs = $1;
5748                                                 if (length($leading_tabs) + 1 ne length($new_leading_tabs)) {
5749                                                         $do_fix = 0;
5750                                                 }
5751                                         } else {
5752                                                 $do_fix = 0;
5753                                         }
5754                                         if ($do_fix) {
5755                                                 fix_delete_line($fixlinenr - 1, $prevrawline);
5756                                                 $fixed[$fixlinenr] =~ s/^\+$new_leading_tabs/\+$leading_tabs/;
5757                                         }
5758                                 }
5759                         }
5760                 }
5761
5762 # check for unnecessary "Out of Memory" messages
5763                 if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
5764                     $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&
5765                     (defined $1 || defined $3) &&
5766                     $linenr > 3) {
5767                         my $testval = $2;
5768                         my $testline = $lines[$linenr - 3];
5769
5770                         my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
5771 #                       print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
5772
5773                         if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*$allocFunctions\s*\(/ &&
5774                             $s !~ /\b__GFP_NOWARN\b/ ) {
5775                                 WARN("OOM_MESSAGE",
5776                                      "Possible unnecessary 'out of memory' message\n" . $hereprev);
5777                         }
5778                 }
5779
5780 # check for logging functions with KERN_<LEVEL>
5781                 if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
5782                     $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
5783                         my $level = $1;
5784                         if (WARN("UNNECESSARY_KERN_LEVEL",
5785                                  "Possible unnecessary $level\n" . $herecurr) &&
5786                             $fix) {
5787                                 $fixed[$fixlinenr] =~ s/\s*$level\s*//;
5788                         }
5789                 }
5790
5791 # check for logging continuations
5792                 if ($line =~ /\bprintk\s*\(\s*KERN_CONT\b|\bpr_cont\s*\(/) {
5793                         WARN("LOGGING_CONTINUATION",
5794                              "Avoid logging continuation uses where feasible\n" . $herecurr);
5795                 }
5796
5797 # check for mask then right shift without a parentheses
5798                 if ($perl_version_ok &&
5799                     $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
5800                     $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
5801                         WARN("MASK_THEN_SHIFT",
5802                              "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
5803                 }
5804
5805 # check for pointer comparisons to NULL
5806                 if ($perl_version_ok) {
5807                         while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) {
5808                                 my $val = $1;
5809                                 my $equal = "!";
5810                                 $equal = "" if ($4 eq "!=");
5811                                 if (CHK("COMPARISON_TO_NULL",
5812                                         "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) &&
5813                                             $fix) {
5814                                         $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/;
5815                                 }
5816                         }
5817                 }
5818
5819 # check for bad placement of section $InitAttribute (e.g.: __initdata)
5820                 if ($line =~ /(\b$InitAttribute\b)/) {
5821                         my $attr = $1;
5822                         if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
5823                                 my $ptr = $1;
5824                                 my $var = $2;
5825                                 if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
5826                                       ERROR("MISPLACED_INIT",
5827                                             "$attr should be placed after $var\n" . $herecurr)) ||
5828                                      ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
5829                                       WARN("MISPLACED_INIT",
5830                                            "$attr should be placed after $var\n" . $herecurr))) &&
5831                                     $fix) {
5832                                         $fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
5833                                 }
5834                         }
5835                 }
5836
5837 # check for $InitAttributeData (ie: __initdata) with const
5838                 if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
5839                         my $attr = $1;
5840                         $attr =~ /($InitAttributePrefix)(.*)/;
5841                         my $attr_prefix = $1;
5842                         my $attr_type = $2;
5843                         if (ERROR("INIT_ATTRIBUTE",
5844                                   "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
5845                             $fix) {
5846                                 $fixed[$fixlinenr] =~
5847                                     s/$InitAttributeData/${attr_prefix}initconst/;
5848                         }
5849                 }
5850
5851 # check for $InitAttributeConst (ie: __initconst) without const
5852                 if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
5853                         my $attr = $1;
5854                         if (ERROR("INIT_ATTRIBUTE",
5855                                   "Use of $attr requires a separate use of const\n" . $herecurr) &&
5856                             $fix) {
5857                                 my $lead = $fixed[$fixlinenr] =~
5858                                     /(^\+\s*(?:static\s+))/;
5859                                 $lead = rtrim($1);
5860                                 $lead = "$lead " if ($lead !~ /^\+$/);
5861                                 $lead = "${lead}const ";
5862                                 $fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/;
5863                         }
5864                 }
5865
5866 # check for __read_mostly with const non-pointer (should just be const)
5867                 if ($line =~ /\b__read_mostly\b/ &&
5868                     $line =~ /($Type)\s*$Ident/ && $1 !~ /\*\s*$/ && $1 =~ /\bconst\b/) {
5869                         if (ERROR("CONST_READ_MOSTLY",
5870                                   "Invalid use of __read_mostly with const type\n" . $herecurr) &&
5871                             $fix) {
5872                                 $fixed[$fixlinenr] =~ s/\s+__read_mostly\b//;
5873                         }
5874                 }
5875
5876 # don't use __constant_<foo> functions outside of include/uapi/
5877                 if ($realfile !~ m@^include/uapi/@ &&
5878                     $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
5879                         my $constant_func = $1;
5880                         my $func = $constant_func;
5881                         $func =~ s/^__constant_//;
5882                         if (WARN("CONSTANT_CONVERSION",
5883                                  "$constant_func should be $func\n" . $herecurr) &&
5884                             $fix) {
5885                                 $fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g;
5886                         }
5887                 }
5888
5889 # prefer usleep_range over udelay
5890                 if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
5891                         my $delay = $1;
5892                         # ignore udelay's < 10, however
5893                         if (! ($delay < 10) ) {
5894                                 CHK("USLEEP_RANGE",
5895                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.rst\n" . $herecurr);
5896                         }
5897                         if ($delay > 2000) {
5898                                 WARN("LONG_UDELAY",
5899                                      "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
5900                         }
5901                 }
5902
5903 # warn about unexpectedly long msleep's
5904                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
5905                         if ($1 < 20) {
5906                                 WARN("MSLEEP",
5907                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.rst\n" . $herecurr);
5908                         }
5909                 }
5910
5911 # check for comparisons of jiffies
5912                 if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
5913                         WARN("JIFFIES_COMPARISON",
5914                              "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
5915                 }
5916
5917 # check for comparisons of get_jiffies_64()
5918                 if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
5919                         WARN("JIFFIES_COMPARISON",
5920                              "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
5921                 }
5922
5923 # warn about #ifdefs in C files
5924 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
5925 #                       print "#ifdef in C files should be avoided\n";
5926 #                       print "$herecurr";
5927 #                       $clean = 0;
5928 #               }
5929
5930 # warn about spacing in #ifdefs
5931                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
5932                         if (ERROR("SPACING",
5933                                   "exactly one space required after that #$1\n" . $herecurr) &&
5934                             $fix) {
5935                                 $fixed[$fixlinenr] =~
5936                                     s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
5937                         }
5938
5939                 }
5940
5941 # check for spinlock_t definitions without a comment.
5942                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
5943                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
5944                         my $which = $1;
5945                         if (!ctx_has_comment($first_line, $linenr)) {
5946                                 CHK("UNCOMMENTED_DEFINITION",
5947                                     "$1 definition without comment\n" . $herecurr);
5948                         }
5949                 }
5950 # check for memory barriers without a comment.
5951
5952                 my $barriers = qr{
5953                         mb|
5954                         rmb|
5955                         wmb|
5956                         read_barrier_depends
5957                 }x;
5958                 my $barrier_stems = qr{
5959                         mb__before_atomic|
5960                         mb__after_atomic|
5961                         store_release|
5962                         load_acquire|
5963                         store_mb|
5964                         (?:$barriers)
5965                 }x;
5966                 my $all_barriers = qr{
5967                         (?:$barriers)|
5968                         smp_(?:$barrier_stems)|
5969                         virt_(?:$barrier_stems)
5970                 }x;
5971
5972                 if ($line =~ /\b(?:$all_barriers)\s*\(/) {
5973                         if (!ctx_has_comment($first_line, $linenr)) {
5974                                 WARN("MEMORY_BARRIER",
5975                                      "memory barrier without comment\n" . $herecurr);
5976                         }
5977                 }
5978
5979                 my $underscore_smp_barriers = qr{__smp_(?:$barrier_stems)}x;
5980
5981                 if ($realfile !~ m@^include/asm-generic/@ &&
5982                     $realfile !~ m@/barrier\.h$@ &&
5983                     $line =~ m/\b(?:$underscore_smp_barriers)\s*\(/ &&
5984                     $line !~ m/^.\s*\#\s*define\s+(?:$underscore_smp_barriers)\s*\(/) {
5985                         WARN("MEMORY_BARRIER",
5986                              "__smp memory barriers shouldn't be used outside barrier.h and asm-generic\n" . $herecurr);
5987                 }
5988
5989 # check for waitqueue_active without a comment.
5990                 if ($line =~ /\bwaitqueue_active\s*\(/) {
5991                         if (!ctx_has_comment($first_line, $linenr)) {
5992                                 WARN("WAITQUEUE_ACTIVE",
5993                                      "waitqueue_active without comment\n" . $herecurr);
5994                         }
5995                 }
5996
5997 # check for smp_read_barrier_depends and read_barrier_depends
5998                 if (!$file && $line =~ /\b(smp_|)read_barrier_depends\s*\(/) {
5999                         WARN("READ_BARRIER_DEPENDS",
6000                              "$1read_barrier_depends should only be used in READ_ONCE or DEC Alpha code\n" . $herecurr);
6001                 }
6002
6003 # check of hardware specific defines
6004                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
6005                         CHK("ARCH_DEFINES",
6006                             "architecture specific defines should be avoided\n" .  $herecurr);
6007                 }
6008
6009 # check that the storage class is not after a type
6010                 if ($line =~ /\b($Type)\s+($Storage)\b/) {
6011                         WARN("STORAGE_CLASS",
6012                              "storage class '$2' should be located before type '$1'\n" . $herecurr);
6013                 }
6014 # Check that the storage class is at the beginning of a declaration
6015                 if ($line =~ /\b$Storage\b/ &&
6016                     $line !~ /^.\s*$Storage/ &&
6017                     $line =~ /^.\s*(.+?)\$Storage\s/ &&
6018                     $1 !~ /[\,\)]\s*$/) {
6019                         WARN("STORAGE_CLASS",
6020                              "storage class should be at the beginning of the declaration\n" . $herecurr);
6021                 }
6022
6023 # check the location of the inline attribute, that it is between
6024 # storage class and type.
6025                 if ($line =~ /\b$Type\s+$Inline\b/ ||
6026                     $line =~ /\b$Inline\s+$Storage\b/) {
6027                         ERROR("INLINE_LOCATION",
6028                               "inline keyword should sit between storage class and type\n" . $herecurr);
6029                 }
6030
6031 # Check for __inline__ and __inline, prefer inline
6032                 if ($realfile !~ m@\binclude/uapi/@ &&
6033                     $line =~ /\b(__inline__|__inline)\b/) {
6034                         if (WARN("INLINE",
6035                                  "plain inline is preferred over $1\n" . $herecurr) &&
6036                             $fix) {
6037                                 $fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/;
6038
6039                         }
6040                 }
6041
6042 # Check for __attribute__ packed, prefer __packed
6043                 if ($realfile !~ m@\binclude/uapi/@ &&
6044                     $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
6045                         WARN("PREFER_PACKED",
6046                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
6047                 }
6048
6049 # Check for __attribute__ aligned, prefer __aligned
6050                 if ($realfile !~ m@\binclude/uapi/@ &&
6051                     $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
6052                         WARN("PREFER_ALIGNED",
6053                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
6054                 }
6055
6056 # Check for __attribute__ section, prefer __section
6057                 if ($realfile !~ m@\binclude/uapi/@ &&
6058                     $line =~ /\b__attribute__\s*\(\s*\(.*_*section_*\s*\(\s*("[^"]*")/) {
6059                         my $old = substr($rawline, $-[1], $+[1] - $-[1]);
6060                         my $new = substr($old, 1, -1);
6061                         if (WARN("PREFER_SECTION",
6062                                  "__section($new) is preferred over __attribute__((section($old)))\n" . $herecurr) &&
6063                             $fix) {
6064                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*_*section_*\s*\(\s*\Q$old\E\s*\)\s*\)\s*\)/__section($new)/;
6065                         }
6066                 }
6067
6068 # Check for __attribute__ format(printf, prefer __printf
6069                 if ($realfile !~ m@\binclude/uapi/@ &&
6070                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
6071                         if (WARN("PREFER_PRINTF",
6072                                  "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
6073                             $fix) {
6074                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;
6075
6076                         }
6077                 }
6078
6079 # Check for __attribute__ format(scanf, prefer __scanf
6080                 if ($realfile !~ m@\binclude/uapi/@ &&
6081                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
6082                         if (WARN("PREFER_SCANF",
6083                                  "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
6084                             $fix) {
6085                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
6086                         }
6087                 }
6088
6089 # Check for __attribute__ weak, or __weak declarations (may have link issues)
6090                 if ($perl_version_ok &&
6091                     $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
6092                     ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
6093                      $line =~ /\b__weak\b/)) {
6094                         ERROR("WEAK_DECLARATION",
6095                               "Using weak declarations can have unintended link defects\n" . $herecurr);
6096                 }
6097
6098 # check for c99 types like uint8_t used outside of uapi/ and tools/
6099                 if ($realfile !~ m@\binclude/uapi/@ &&
6100                     $realfile !~ m@\btools/@ &&
6101                     $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) {
6102                         my $type = $1;
6103                         if ($type =~ /\b($typeC99Typedefs)\b/) {
6104                                 $type = $1;
6105                                 my $kernel_type = 'u';
6106                                 $kernel_type = 's' if ($type =~ /^_*[si]/);
6107                                 $type =~ /(\d+)/;
6108                                 $kernel_type .= $1;
6109                                 if (CHK("PREFER_KERNEL_TYPES",
6110                                         "Prefer kernel type '$kernel_type' over '$type'\n" . $herecurr) &&
6111                                     $fix) {
6112                                         $fixed[$fixlinenr] =~ s/\b$type\b/$kernel_type/;
6113                                 }
6114                         }
6115                 }
6116
6117 # check for cast of C90 native int or longer types constants
6118                 if ($line =~ /(\(\s*$C90_int_types\s*\)\s*)($Constant)\b/) {
6119                         my $cast = $1;
6120                         my $const = $2;
6121                         if (WARN("TYPECAST_INT_CONSTANT",
6122                                  "Unnecessary typecast of c90 int constant\n" . $herecurr) &&
6123                             $fix) {
6124                                 my $suffix = "";
6125                                 my $newconst = $const;
6126                                 $newconst =~ s/${Int_type}$//;
6127                                 $suffix .= 'U' if ($cast =~ /\bunsigned\b/);
6128                                 if ($cast =~ /\blong\s+long\b/) {
6129                                         $suffix .= 'LL';
6130                                 } elsif ($cast =~ /\blong\b/) {
6131                                         $suffix .= 'L';
6132                                 }
6133                                 $fixed[$fixlinenr] =~ s/\Q$cast\E$const\b/$newconst$suffix/;
6134                         }
6135                 }
6136
6137 # check for sizeof(&)
6138                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
6139                         WARN("SIZEOF_ADDRESS",
6140                              "sizeof(& should be avoided\n" . $herecurr);
6141                 }
6142
6143 # check for sizeof without parenthesis
6144                 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
6145                         if (WARN("SIZEOF_PARENTHESIS",
6146                                  "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
6147                             $fix) {
6148                                 $fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
6149                         }
6150                 }
6151
6152 # check for struct spinlock declarations
6153                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
6154                         WARN("USE_SPINLOCK_T",
6155                              "struct spinlock should be spinlock_t\n" . $herecurr);
6156                 }
6157
6158 # check for seq_printf uses that could be seq_puts
6159                 if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
6160                         my $fmt = get_quoted_string($line, $rawline);
6161                         $fmt =~ s/%%//g;
6162                         if ($fmt !~ /%/) {
6163                                 if (WARN("PREFER_SEQ_PUTS",
6164                                          "Prefer seq_puts to seq_printf\n" . $herecurr) &&
6165                                     $fix) {
6166                                         $fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/;
6167                                 }
6168                         }
6169                 }
6170
6171 # check for vsprintf extension %p<foo> misuses
6172                 if ($perl_version_ok &&
6173                     defined $stat &&
6174                     $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s &&
6175                     $1 !~ /^_*volatile_*$/) {
6176                         my $stat_real;
6177
6178                         my $lc = $stat =~ tr@\n@@;
6179                         $lc = $lc + $linenr;
6180                         for (my $count = $linenr; $count <= $lc; $count++) {
6181                                 my $specifier;
6182                                 my $extension;
6183                                 my $qualifier;
6184                                 my $bad_specifier = "";
6185                                 my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
6186                                 $fmt =~ s/%%//g;
6187
6188                                 while ($fmt =~ /(\%[\*\d\.]*p(\w)(\w*))/g) {
6189                                         $specifier = $1;
6190                                         $extension = $2;
6191                                         $qualifier = $3;
6192                                         if ($extension !~ /[SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
6193                                             ($extension eq "f" &&
6194                                              defined $qualifier && $qualifier !~ /^w/)) {
6195                                                 $bad_specifier = $specifier;
6196                                                 last;
6197                                         }
6198                                         if ($extension eq "x" && !defined($stat_real)) {
6199                                                 if (!defined($stat_real)) {
6200                                                         $stat_real = get_stat_real($linenr, $lc);
6201                                                 }
6202                                                 WARN("VSPRINTF_SPECIFIER_PX",
6203                                                      "Using vsprintf specifier '\%px' potentially exposes the kernel memory layout, if you don't really need the address please consider using '\%p'.\n" . "$here\n$stat_real\n");
6204                                         }
6205                                 }
6206                                 if ($bad_specifier ne "") {
6207                                         my $stat_real = get_stat_real($linenr, $lc);
6208                                         my $ext_type = "Invalid";
6209                                         my $use = "";
6210                                         if ($bad_specifier =~ /p[Ff]/) {
6211                                                 $use = " - use %pS instead";
6212                                                 $use =~ s/pS/ps/ if ($bad_specifier =~ /pf/);
6213                                         }
6214
6215                                         WARN("VSPRINTF_POINTER_EXTENSION",
6216                                              "$ext_type vsprintf pointer extension '$bad_specifier'$use\n" . "$here\n$stat_real\n");
6217                                 }
6218                         }
6219                 }
6220
6221 # Check for misused memsets
6222                 if ($perl_version_ok &&
6223                     defined $stat &&
6224                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/) {
6225
6226                         my $ms_addr = $2;
6227                         my $ms_val = $7;
6228                         my $ms_size = $12;
6229
6230                         if ($ms_size =~ /^(0x|)0$/i) {
6231                                 ERROR("MEMSET",
6232                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
6233                         } elsif ($ms_size =~ /^(0x|)1$/i) {
6234                                 WARN("MEMSET",
6235                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
6236                         }
6237                 }
6238
6239 # Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
6240 #               if ($perl_version_ok &&
6241 #                   defined $stat &&
6242 #                   $stat =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
6243 #                       if (WARN("PREFER_ETHER_ADDR_COPY",
6244 #                                "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . "$here\n$stat\n") &&
6245 #                           $fix) {
6246 #                               $fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
6247 #                       }
6248 #               }
6249
6250 # Check for memcmp(foo, bar, ETH_ALEN) that could be ether_addr_equal*(foo, bar)
6251 #               if ($perl_version_ok &&
6252 #                   defined $stat &&
6253 #                   $stat =~ /^\+(?:.*?)\bmemcmp\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
6254 #                       WARN("PREFER_ETHER_ADDR_EQUAL",
6255 #                            "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n")
6256 #               }
6257
6258 # check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr
6259 # check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr
6260 #               if ($perl_version_ok &&
6261 #                   defined $stat &&
6262 #                   $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
6263 #
6264 #                       my $ms_val = $7;
6265 #
6266 #                       if ($ms_val =~ /^(?:0x|)0+$/i) {
6267 #                               if (WARN("PREFER_ETH_ZERO_ADDR",
6268 #                                        "Prefer eth_zero_addr over memset()\n" . "$here\n$stat\n") &&
6269 #                                   $fix) {
6270 #                                       $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($2)/;
6271 #                               }
6272 #                       } elsif ($ms_val =~ /^(?:0xff|255)$/i) {
6273 #                               if (WARN("PREFER_ETH_BROADCAST_ADDR",
6274 #                                        "Prefer eth_broadcast_addr() over memset()\n" . "$here\n$stat\n") &&
6275 #                                   $fix) {
6276 #                                       $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($2)/;
6277 #                               }
6278 #                       }
6279 #               }
6280
6281 # typecasts on min/max could be min_t/max_t
6282                 if ($perl_version_ok &&
6283                     defined $stat &&
6284                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
6285                         if (defined $2 || defined $7) {
6286                                 my $call = $1;
6287                                 my $cast1 = deparenthesize($2);
6288                                 my $arg1 = $3;
6289                                 my $cast2 = deparenthesize($7);
6290                                 my $arg2 = $8;
6291                                 my $cast;
6292
6293                                 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
6294                                         $cast = "$cast1 or $cast2";
6295                                 } elsif ($cast1 ne "") {
6296                                         $cast = $cast1;
6297                                 } else {
6298                                         $cast = $cast2;
6299                                 }
6300                                 WARN("MINMAX",
6301                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
6302                         }
6303                 }
6304
6305 # check usleep_range arguments
6306                 if ($perl_version_ok &&
6307                     defined $stat &&
6308                     $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
6309                         my $min = $1;
6310                         my $max = $7;
6311                         if ($min eq $max) {
6312                                 WARN("USLEEP_RANGE",
6313                                      "usleep_range should not use min == max args; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
6314                         } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
6315                                  $min > $max) {
6316                                 WARN("USLEEP_RANGE",
6317                                      "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
6318                         }
6319                 }
6320
6321 # check for naked sscanf
6322                 if ($perl_version_ok &&
6323                     defined $stat &&
6324                     $line =~ /\bsscanf\b/ &&
6325                     ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
6326                      $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
6327                      $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
6328                         my $lc = $stat =~ tr@\n@@;
6329                         $lc = $lc + $linenr;
6330                         my $stat_real = get_stat_real($linenr, $lc);
6331                         WARN("NAKED_SSCANF",
6332                              "unchecked sscanf return value\n" . "$here\n$stat_real\n");
6333                 }
6334
6335 # check for simple sscanf that should be kstrto<foo>
6336                 if ($perl_version_ok &&
6337                     defined $stat &&
6338                     $line =~ /\bsscanf\b/) {
6339                         my $lc = $stat =~ tr@\n@@;
6340                         $lc = $lc + $linenr;
6341                         my $stat_real = get_stat_real($linenr, $lc);
6342                         if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) {
6343                                 my $format = $6;
6344                                 my $count = $format =~ tr@%@%@;
6345                                 if ($count == 1 &&
6346                                     $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) {
6347                                         WARN("SSCANF_TO_KSTRTO",
6348                                              "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n");
6349                                 }
6350                         }
6351                 }
6352
6353 # check for new externs in .h files.
6354                 if ($realfile =~ /\.h$/ &&
6355                     $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
6356                         if (CHK("AVOID_EXTERNS",
6357                                 "extern prototypes should be avoided in .h files\n" . $herecurr) &&
6358                             $fix) {
6359                                 $fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
6360                         }
6361                 }
6362
6363 # check for new externs in .c files.
6364                 if ($realfile =~ /\.c$/ && defined $stat &&
6365                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
6366                 {
6367                         my $function_name = $1;
6368                         my $paren_space = $2;
6369
6370                         my $s = $stat;
6371                         if (defined $cond) {
6372                                 substr($s, 0, length($cond), '');
6373                         }
6374                         if ($s =~ /^\s*;/ &&
6375                             $function_name ne 'uninitialized_var')
6376                         {
6377                                 WARN("AVOID_EXTERNS",
6378                                      "externs should be avoided in .c files\n" .  $herecurr);
6379                         }
6380
6381                         if ($paren_space =~ /\n/) {
6382                                 WARN("FUNCTION_ARGUMENTS",
6383                                      "arguments for function declarations should follow identifier\n" . $herecurr);
6384                         }
6385
6386                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
6387                     $stat =~ /^.\s*extern\s+/)
6388                 {
6389                         WARN("AVOID_EXTERNS",
6390                              "externs should be avoided in .c files\n" .  $herecurr);
6391                 }
6392
6393 # check for function declarations that have arguments without identifier names
6394 # while avoiding uninitialized_var(x)
6395                 if (defined $stat &&
6396                     $stat =~ /^.\s*(?:extern\s+)?$Type\s*(?:($Ident)|\(\s*\*\s*$Ident\s*\))\s*\(\s*([^{]+)\s*\)\s*;/s &&
6397                     (!defined($1) ||
6398                      (defined($1) && $1 ne "uninitialized_var")) &&
6399                      $2 ne "void") {
6400                         my $args = trim($2);
6401                         while ($args =~ m/\s*($Type\s*(?:$Ident|\(\s*\*\s*$Ident?\s*\)\s*$balanced_parens)?)/g) {
6402                                 my $arg = trim($1);
6403                                 if ($arg =~ /^$Type$/ &&
6404                                         $arg !~ /enum\s+$Ident$/) {
6405                                         WARN("FUNCTION_ARGUMENTS",
6406                                              "function definition argument '$arg' should also have an identifier name\n" . $herecurr);
6407                                 }
6408                         }
6409                 }
6410
6411 # check for function definitions
6412                 if ($perl_version_ok &&
6413                     defined $stat &&
6414                     $stat =~ /^.\s*(?:$Storage\s+)?$Type\s*($Ident)\s*$balanced_parens\s*{/s) {
6415                         $context_function = $1;
6416
6417 # check for multiline function definition with misplaced open brace
6418                         my $ok = 0;
6419                         my $cnt = statement_rawlines($stat);
6420                         my $herectx = $here . "\n";
6421                         for (my $n = 0; $n < $cnt; $n++) {
6422                                 my $rl = raw_line($linenr, $n);
6423                                 $herectx .=  $rl . "\n";
6424                                 $ok = 1 if ($rl =~ /^[ \+]\{/);
6425                                 $ok = 1 if ($rl =~ /\{/ && $n == 0);
6426                                 last if $rl =~ /^[ \+].*\{/;
6427                         }
6428                         if (!$ok) {
6429                                 ERROR("OPEN_BRACE",
6430                                       "open brace '{' following function definitions go on the next line\n" . $herectx);
6431                         }
6432                 }
6433
6434 # checks for new __setup's
6435                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
6436                         my $name = $1;
6437
6438                         if (!grep(/$name/, @setup_docs)) {
6439                                 CHK("UNDOCUMENTED_SETUP",
6440                                     "__setup appears un-documented -- check Documentation/admin-guide/kernel-parameters.rst\n" . $herecurr);
6441                         }
6442                 }
6443
6444 # check for pointless casting of alloc functions
6445                 if ($line =~ /\*\s*\)\s*$allocFunctions\b/) {
6446                         WARN("UNNECESSARY_CASTS",
6447                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
6448                 }
6449
6450 # alloc style
6451 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
6452                 if ($perl_version_ok &&
6453                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k|v)[mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
6454                         CHK("ALLOC_SIZEOF_STRUCT",
6455                             "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
6456                 }
6457
6458 # check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
6459                 if ($perl_version_ok &&
6460                     defined $stat &&
6461                     $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
6462                         my $oldfunc = $3;
6463                         my $a1 = $4;
6464                         my $a2 = $10;
6465                         my $newfunc = "kmalloc_array";
6466                         $newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
6467                         my $r1 = $a1;
6468                         my $r2 = $a2;
6469                         if ($a1 =~ /^sizeof\s*\S/) {
6470                                 $r1 = $a2;
6471                                 $r2 = $a1;
6472                         }
6473                         if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
6474                             !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
6475                                 my $cnt = statement_rawlines($stat);
6476                                 my $herectx = get_stat_here($linenr, $cnt, $here);
6477
6478                                 if (WARN("ALLOC_WITH_MULTIPLY",
6479                                          "Prefer $newfunc over $oldfunc with multiply\n" . $herectx) &&
6480                                     $cnt == 1 &&
6481                                     $fix) {
6482                                         $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
6483                                 }
6484                         }
6485                 }
6486
6487 # check for krealloc arg reuse
6488                 if ($perl_version_ok &&
6489                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*($Lval)\s*,/ &&
6490                     $1 eq $3) {
6491                         WARN("KREALLOC_ARG_REUSE",
6492                              "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
6493                 }
6494
6495 # check for alloc argument mismatch
6496                 if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
6497                         WARN("ALLOC_ARRAY_ARGS",
6498                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
6499                 }
6500
6501 # check for multiple semicolons
6502                 if ($line =~ /;\s*;\s*$/) {
6503                         if (WARN("ONE_SEMICOLON",
6504                                  "Statements terminations use 1 semicolon\n" . $herecurr) &&
6505                             $fix) {
6506                                 $fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g;
6507                         }
6508                 }
6509
6510 # check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi
6511                 if ($realfile !~ m@^include/uapi/@ &&
6512                     $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
6513                         my $ull = "";
6514                         $ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
6515                         if (CHK("BIT_MACRO",
6516                                 "Prefer using the BIT$ull macro\n" . $herecurr) &&
6517                             $fix) {
6518                                 $fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
6519                         }
6520                 }
6521
6522 # check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE
6523                 if ($line =~ /^\+\s*#\s*if\s+defined(?:\s*\(?\s*|\s+)(CONFIG_[A-Z_]+)\s*\)?\s*\|\|\s*defined(?:\s*\(?\s*|\s+)\1_MODULE\s*\)?\s*$/) {
6524                         my $config = $1;
6525                         if (WARN("PREFER_IS_ENABLED",
6526                                  "Prefer IS_ENABLED(<FOO>) to CONFIG_<FOO> || CONFIG_<FOO>_MODULE\n" . $herecurr) &&
6527                             $fix) {
6528                                 $fixed[$fixlinenr] = "\+#if IS_ENABLED($config)";
6529                         }
6530                 }
6531
6532 # check for case / default statements not preceded by break/fallthrough/switch
6533                 if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
6534                         my $has_break = 0;
6535                         my $has_statement = 0;
6536                         my $count = 0;
6537                         my $prevline = $linenr;
6538                         while ($prevline > 1 && ($file || $count < 3) && !$has_break) {
6539                                 $prevline--;
6540                                 my $rline = $rawlines[$prevline - 1];
6541                                 my $fline = $lines[$prevline - 1];
6542                                 last if ($fline =~ /^\@\@/);
6543                                 next if ($fline =~ /^\-/);
6544                                 next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
6545                                 $has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
6546                                 next if ($fline =~ /^.[\s$;]*$/);
6547                                 $has_statement = 1;
6548                                 $count++;
6549                                 $has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|exit\s*\(\b|return\b|goto\b|continue\b)/);
6550                         }
6551                         if (!$has_break && $has_statement) {
6552                                 WARN("MISSING_BREAK",
6553                                      "Possible switch case/default not preceded by break or fallthrough comment\n" . $herecurr);
6554                         }
6555                 }
6556
6557 # check for /* fallthrough */ like comment, prefer fallthrough;
6558                 my @fallthroughs = (
6559                         'fallthrough',
6560                         '@fallthrough@',
6561                         'lint -fallthrough[ \t]*',
6562                         'intentional(?:ly)?[ \t]*fall(?:(?:s | |-)[Tt]|t)hr(?:ough|u|ew)',
6563                         '(?:else,?\s*)?FALL(?:S | |-)?THR(?:OUGH|U|EW)[ \t.!]*(?:-[^\n\r]*)?',
6564                         'Fall(?:(?:s | |-)[Tt]|t)hr(?:ough|u|ew)[ \t.!]*(?:-[^\n\r]*)?',
6565                         'fall(?:s | |-)?thr(?:ough|u|ew)[ \t.!]*(?:-[^\n\r]*)?',
6566                     );
6567                 if ($raw_comment ne '') {
6568                         foreach my $ft (@fallthroughs) {
6569                                 if ($raw_comment =~ /$ft/) {
6570                                         my $msg_level = \&WARN;
6571                                         $msg_level = \&CHK if ($file);
6572                                         &{$msg_level}("PREFER_FALLTHROUGH",
6573                                                       "Prefer 'fallthrough;' over fallthrough comment\n" . $herecurr);
6574                                         last;
6575                                 }
6576                         }
6577                 }
6578
6579 # check for switch/default statements without a break;
6580                 if ($perl_version_ok &&
6581                     defined $stat &&
6582                     $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
6583                         my $cnt = statement_rawlines($stat);
6584                         my $herectx = get_stat_here($linenr, $cnt, $here);
6585
6586                         WARN("DEFAULT_NO_BREAK",
6587                              "switch default: should use break\n" . $herectx);
6588                 }
6589
6590 # check for gcc specific __FUNCTION__
6591                 if ($line =~ /\b__FUNCTION__\b/) {
6592                         if (WARN("USE_FUNC",
6593                                  "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr) &&
6594                             $fix) {
6595                                 $fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g;
6596                         }
6597                 }
6598
6599 # check for uses of __DATE__, __TIME__, __TIMESTAMP__
6600                 while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
6601                         ERROR("DATE_TIME",
6602                               "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
6603                 }
6604
6605 # check for use of yield()
6606                 if ($line =~ /\byield\s*\(\s*\)/) {
6607                         WARN("YIELD",
6608                              "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
6609                 }
6610
6611 # check for comparisons against true and false
6612                 if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
6613                         my $lead = $1;
6614                         my $arg = $2;
6615                         my $test = $3;
6616                         my $otype = $4;
6617                         my $trail = $5;
6618                         my $op = "!";
6619
6620                         ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);
6621
6622                         my $type = lc($otype);
6623                         if ($type =~ /^(?:true|false)$/) {
6624                                 if (("$test" eq "==" && "$type" eq "true") ||
6625                                     ("$test" eq "!=" && "$type" eq "false")) {
6626                                         $op = "";
6627                                 }
6628
6629                                 CHK("BOOL_COMPARISON",
6630                                     "Using comparison to $otype is error prone\n" . $herecurr);
6631
6632 ## maybe suggesting a correct construct would better
6633 ##                                  "Using comparison to $otype is error prone.  Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr);
6634
6635                         }
6636                 }
6637
6638 # check for semaphores initialized locked
6639                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
6640                         WARN("CONSIDER_COMPLETION",
6641                              "consider using a completion\n" . $herecurr);
6642                 }
6643
6644 # recommend kstrto* over simple_strto* and strict_strto*
6645                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
6646                         WARN("CONSIDER_KSTRTO",
6647                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
6648                 }
6649
6650 # check for __initcall(), use device_initcall() explicitly or more appropriate function please
6651                 if ($line =~ /^.\s*__initcall\s*\(/) {
6652                         WARN("USE_DEVICE_INITCALL",
6653                              "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
6654                 }
6655
6656 # check for spin_is_locked(), suggest lockdep instead
6657                 if ($line =~ /\bspin_is_locked\(/) {
6658                         WARN("USE_LOCKDEP",
6659                              "Where possible, use lockdep_assert_held instead of assertions based on spin_is_locked\n" . $herecurr);
6660                 }
6661
6662 # check for deprecated apis
6663                 if ($line =~ /\b($deprecated_apis_search)\b\s*\(/) {
6664                         my $deprecated_api = $1;
6665                         my $new_api = $deprecated_apis{$deprecated_api};
6666                         WARN("DEPRECATED_API",
6667                              "Deprecated use of '$deprecated_api', prefer '$new_api' instead\n" . $herecurr);
6668                 }
6669
6670 # check for various structs that are normally const (ops, kgdb, device_tree)
6671 # and avoid what seem like struct definitions 'struct foo {'
6672                 if ($line !~ /\bconst\b/ &&
6673                     $line =~ /\bstruct\s+($const_structs)\b(?!\s*\{)/) {
6674                         WARN("CONST_STRUCT",
6675                              "struct $1 should normally be const\n" . $herecurr);
6676                 }
6677
6678 # use of NR_CPUS is usually wrong
6679 # ignore definitions of NR_CPUS and usage to define arrays as likely right
6680                 if ($line =~ /\bNR_CPUS\b/ &&
6681                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
6682                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
6683                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
6684                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
6685                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
6686                 {
6687                         WARN("NR_CPUS",
6688                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
6689                 }
6690
6691 # Use of __ARCH_HAS_<FOO> or ARCH_HAVE_<BAR> is wrong.
6692                 if ($line =~ /\+\s*#\s*define\s+((?:__)?ARCH_(?:HAS|HAVE)\w*)\b/) {
6693                         ERROR("DEFINE_ARCH_HAS",
6694                               "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
6695                 }
6696
6697 # likely/unlikely comparisons similar to "(likely(foo) > 0)"
6698                 if ($perl_version_ok &&
6699                     $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
6700                         WARN("LIKELY_MISUSE",
6701                              "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
6702                 }
6703
6704 # nested likely/unlikely calls
6705                 if ($line =~ /\b(?:(?:un)?likely)\s*\(\s*!?\s*(IS_ERR(?:_OR_NULL|_VALUE)?|WARN)/) {
6706                         WARN("LIKELY_MISUSE",
6707                              "nested (un)?likely() calls, $1 already uses unlikely() internally\n" . $herecurr);
6708                 }
6709
6710 # whine mightly about in_atomic
6711                 if ($line =~ /\bin_atomic\s*\(/) {
6712                         if ($realfile =~ m@^drivers/@) {
6713                                 ERROR("IN_ATOMIC",
6714                                       "do not use in_atomic in drivers\n" . $herecurr);
6715                         } elsif ($realfile !~ m@^kernel/@) {
6716                                 WARN("IN_ATOMIC",
6717                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
6718                         }
6719                 }
6720
6721 # check for mutex_trylock_recursive usage
6722                 if ($line =~ /mutex_trylock_recursive/) {
6723                         ERROR("LOCKING",
6724                               "recursive locking is bad, do not use this ever.\n" . $herecurr);
6725                 }
6726
6727 # check for lockdep_set_novalidate_class
6728                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
6729                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
6730                         if ($realfile !~ m@^kernel/lockdep@ &&
6731                             $realfile !~ m@^include/linux/lockdep@ &&
6732                             $realfile !~ m@^drivers/base/core@) {
6733                                 ERROR("LOCKDEP",
6734                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
6735                         }
6736                 }
6737
6738                 if ($line =~ /debugfs_create_\w+.*\b$mode_perms_world_writable\b/ ||
6739                     $line =~ /DEVICE_ATTR.*\b$mode_perms_world_writable\b/) {
6740                         WARN("EXPORTED_WORLD_WRITABLE",
6741                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
6742                 }
6743
6744 # check for DEVICE_ATTR uses that could be DEVICE_ATTR_<FOO>
6745 # and whether or not function naming is typical and if
6746 # DEVICE_ATTR permissions uses are unusual too
6747                 if ($perl_version_ok &&
6748                     defined $stat &&
6749                     $stat =~ /\bDEVICE_ATTR\s*\(\s*(\w+)\s*,\s*\(?\s*(\s*(?:${multi_mode_perms_string_search}|0[0-7]{3,3})\s*)\s*\)?\s*,\s*(\w+)\s*,\s*(\w+)\s*\)/) {
6750                         my $var = $1;
6751                         my $perms = $2;
6752                         my $show = $3;
6753                         my $store = $4;
6754                         my $octal_perms = perms_to_octal($perms);
6755                         if ($show =~ /^${var}_show$/ &&
6756                             $store =~ /^${var}_store$/ &&
6757                             $octal_perms eq "0644") {
6758                                 if (WARN("DEVICE_ATTR_RW",
6759                                          "Use DEVICE_ATTR_RW\n" . $herecurr) &&
6760                                     $fix) {
6761                                         $fixed[$fixlinenr] =~ s/\bDEVICE_ATTR\s*\(\s*$var\s*,\s*\Q$perms\E\s*,\s*$show\s*,\s*$store\s*\)/DEVICE_ATTR_RW(${var})/;
6762                                 }
6763                         } elsif ($show =~ /^${var}_show$/ &&
6764                                  $store =~ /^NULL$/ &&
6765                                  $octal_perms eq "0444") {
6766                                 if (WARN("DEVICE_ATTR_RO",
6767                                          "Use DEVICE_ATTR_RO\n" . $herecurr) &&
6768                                     $fix) {
6769                                         $fixed[$fixlinenr] =~ s/\bDEVICE_ATTR\s*\(\s*$var\s*,\s*\Q$perms\E\s*,\s*$show\s*,\s*NULL\s*\)/DEVICE_ATTR_RO(${var})/;
6770                                 }
6771                         } elsif ($show =~ /^NULL$/ &&
6772                                  $store =~ /^${var}_store$/ &&
6773                                  $octal_perms eq "0200") {
6774                                 if (WARN("DEVICE_ATTR_WO",
6775                                          "Use DEVICE_ATTR_WO\n" . $herecurr) &&
6776                                     $fix) {
6777                                         $fixed[$fixlinenr] =~ s/\bDEVICE_ATTR\s*\(\s*$var\s*,\s*\Q$perms\E\s*,\s*NULL\s*,\s*$store\s*\)/DEVICE_ATTR_WO(${var})/;
6778                                 }
6779                         } elsif ($octal_perms eq "0644" ||
6780                                  $octal_perms eq "0444" ||
6781                                  $octal_perms eq "0200") {
6782                                 my $newshow = "$show";
6783                                 $newshow = "${var}_show" if ($show ne "NULL" && $show ne "${var}_show");
6784                                 my $newstore = $store;
6785                                 $newstore = "${var}_store" if ($store ne "NULL" && $store ne "${var}_store");
6786                                 my $rename = "";
6787                                 if ($show ne $newshow) {
6788                                         $rename .= " '$show' to '$newshow'";
6789                                 }
6790                                 if ($store ne $newstore) {
6791                                         $rename .= " '$store' to '$newstore'";
6792                                 }
6793                                 WARN("DEVICE_ATTR_FUNCTIONS",
6794                                      "Consider renaming function(s)$rename\n" . $herecurr);
6795                         } else {
6796                                 WARN("DEVICE_ATTR_PERMS",
6797                                      "DEVICE_ATTR unusual permissions '$perms' used\n" . $herecurr);
6798                         }
6799                 }
6800
6801 # Mode permission misuses where it seems decimal should be octal
6802 # This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
6803 # o Ignore module_param*(...) uses with a decimal 0 permission as that has a
6804 #   specific definition of not visible in sysfs.
6805 # o Ignore proc_create*(...) uses with a decimal 0 permission as that means
6806 #   use the default permissions
6807                 if ($perl_version_ok &&
6808                     defined $stat &&
6809                     $line =~ /$mode_perms_search/) {
6810                         foreach my $entry (@mode_permission_funcs) {
6811                                 my $func = $entry->[0];
6812                                 my $arg_pos = $entry->[1];
6813
6814                                 my $lc = $stat =~ tr@\n@@;
6815                                 $lc = $lc + $linenr;
6816                                 my $stat_real = get_stat_real($linenr, $lc);
6817
6818                                 my $skip_args = "";
6819                                 if ($arg_pos > 1) {
6820                                         $arg_pos--;
6821                                         $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
6822                                 }
6823                                 my $test = "\\b$func\\s*\\(${skip_args}($FuncArg(?:\\|\\s*$FuncArg)*)\\s*[,\\)]";
6824                                 if ($stat =~ /$test/) {
6825                                         my $val = $1;
6826                                         $val = $6 if ($skip_args ne "");
6827                                         if (!($func =~ /^(?:module_param|proc_create)/ && $val eq "0") &&
6828                                             (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
6829                                              ($val =~ /^$Octal$/ && length($val) ne 4))) {
6830                                                 ERROR("NON_OCTAL_PERMISSIONS",
6831                                                       "Use 4 digit octal (0777) not decimal permissions\n" . "$here\n" . $stat_real);
6832                                         }
6833                                         if ($val =~ /^$Octal$/ && (oct($val) & 02)) {
6834                                                 ERROR("EXPORTED_WORLD_WRITABLE",
6835                                                       "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . "$here\n" . $stat_real);
6836                                         }
6837                                 }
6838                         }
6839                 }
6840
6841 # check for uses of S_<PERMS> that could be octal for readability
6842                 while ($line =~ m{\b($multi_mode_perms_string_search)\b}g) {
6843                         my $oval = $1;
6844                         my $octal = perms_to_octal($oval);
6845                         if (WARN("SYMBOLIC_PERMS",
6846                                  "Symbolic permissions '$oval' are not preferred. Consider using octal permissions '$octal'.\n" . $herecurr) &&
6847                             $fix) {
6848                                 $fixed[$fixlinenr] =~ s/\Q$oval\E/$octal/;
6849                         }
6850                 }
6851
6852 # validate content of MODULE_LICENSE against list from include/linux/module.h
6853                 if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) {
6854                         my $extracted_string = get_quoted_string($line, $rawline);
6855                         my $valid_licenses = qr{
6856                                                 GPL|
6857                                                 GPL\ v2|
6858                                                 GPL\ and\ additional\ rights|
6859                                                 Dual\ BSD/GPL|
6860                                                 Dual\ MIT/GPL|
6861                                                 Dual\ MPL/GPL|
6862                                                 Proprietary
6863                                         }x;
6864                         if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) {
6865                                 WARN("MODULE_LICENSE",
6866                                      "unknown module license " . $extracted_string . "\n" . $herecurr);
6867                         }
6868                 }
6869
6870 # check for sysctl duplicate constants
6871                 if ($line =~ /\.extra[12]\s*=\s*&(zero|one|int_max)\b/) {
6872                         WARN("DUPLICATED_SYSCTL_CONST",
6873                                 "duplicated sysctl range checking value '$1', consider using the shared one in include/linux/sysctl.h\n" . $herecurr);
6874                 }
6875         }
6876
6877         # If we have no input at all, then there is nothing to report on
6878         # so just keep quiet.
6879         if ($#rawlines == -1) {
6880                 exit(0);
6881         }
6882
6883         # In mailback mode only produce a report in the negative, for
6884         # things that appear to be patches.
6885         if ($mailback && ($clean == 1 || !$is_patch)) {
6886                 exit(0);
6887         }
6888
6889         # This is not a patch, and we are are in 'no-patch' mode so
6890         # just keep quiet.
6891         if (!$chk_patch && !$is_patch) {
6892                 exit(0);
6893         }
6894
6895         if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
6896                 ERROR("NOT_UNIFIED_DIFF",
6897                       "Does not appear to be a unified-diff format patch\n");
6898         }
6899         if ($is_patch && $has_commit_log && $chk_signoff) {
6900                 if ($signoff == 0) {
6901                         ERROR("MISSING_SIGN_OFF",
6902                               "Missing Signed-off-by: line(s)\n");
6903                 } elsif (!$authorsignoff) {
6904                         WARN("NO_AUTHOR_SIGN_OFF",
6905                              "Missing Signed-off-by: line by nominal patch author '$author'\n");
6906                 }
6907         }
6908
6909         print report_dump();
6910         if ($summary && !($clean == 1 && $quiet == 1)) {
6911                 print "$filename " if ($summary_file);
6912                 print "total: $cnt_error errors, $cnt_warn warnings, " .
6913                         (($check)? "$cnt_chk checks, " : "") .
6914                         "$cnt_lines lines checked\n";
6915         }
6916
6917         if ($quiet == 0) {
6918                 # If there were any defects found and not already fixing them
6919                 if (!$clean and !$fix) {
6920                         print << "EOM"
6921
6922 NOTE: For some of the reported defects, checkpatch may be able to
6923       mechanically convert to the typical style using --fix or --fix-inplace.
6924 EOM
6925                 }
6926                 # If there were whitespace errors which cleanpatch can fix
6927                 # then suggest that.
6928                 if ($rpt_cleaners) {
6929                         $rpt_cleaners = 0;
6930                         print << "EOM"
6931
6932 NOTE: Whitespace errors detected.
6933       You may wish to use scripts/cleanpatch or scripts/cleanfile
6934 EOM
6935                 }
6936         }
6937
6938         if ($clean == 0 && $fix &&
6939             ("@rawlines" ne "@fixed" ||
6940              $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) {
6941                 my $newfile = $filename;
6942                 $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
6943                 my $linecount = 0;
6944                 my $f;
6945
6946                 @fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted);
6947
6948                 open($f, '>', $newfile)
6949                     or die "$P: Can't open $newfile for write\n";
6950                 foreach my $fixed_line (@fixed) {
6951                         $linecount++;
6952                         if ($file) {
6953                                 if ($linecount > 3) {
6954                                         $fixed_line =~ s/^\+//;
6955                                         print $f $fixed_line . "\n";
6956                                 }
6957                         } else {
6958                                 print $f $fixed_line . "\n";
6959                         }
6960                 }
6961                 close($f);
6962
6963                 if (!$quiet) {
6964                         print << "EOM";
6965
6966 Wrote EXPERIMENTAL --fix correction(s) to '$newfile'
6967
6968 Do _NOT_ trust the results written to this file.
6969 Do _NOT_ submit these changes without inspecting them for correctness.
6970
6971 This EXPERIMENTAL file is simply a convenience to help rewrite patches.
6972 No warranties, expressed or implied...
6973 EOM
6974                 }
6975         }
6976
6977         if ($quiet == 0) {
6978                 print "\n";
6979                 if ($clean == 1) {
6980                         print "$vname has no obvious style problems and is ready for submission.\n";
6981                 } else {
6982                         print "$vname has style problems, please review.\n";
6983                 }
6984         }
6985         return $clean;
6986 }