checkpatch: warn on unnecessary int declarations

On Sun, 2018-08-05 at 08:52 -0700, Linus Torvalds wrote:
> "long unsigned int" isn't _technically_ wrong. But we normally
> call that type "unsigned long".

So add a checkpatch test for it.

Link: http://lkml.kernel.org/r/7bbd97dc0a1e5896a0251fada7bb68bb33643f77.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f43d95a..5971b0c 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3829,6 +3829,26 @@ sub process {
                             "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
                }
 
+# check for unnecessary <signed> int declarations of short/long/long long
+               while ($sline =~ m{\b($TypeMisordered(\s*\*)*|$C90_int_types)\b}g) {
+                       my $type = trim($1);
+                       next if ($type !~ /\bint\b/);
+                       next if ($type !~ /\b(?:short|long\s+long|long)\b/);
+                       my $new_type = $type;
+                       $new_type =~ s/\b\s*int\s*\b/ /;
+                       $new_type =~ s/\b\s*(?:un)?signed\b\s*/ /;
+                       $new_type =~ s/^const\s+//;
+                       $new_type = "unsigned $new_type" if ($type =~ /\bunsigned\b/);
+                       $new_type = "const $new_type" if ($type =~ /^const\b/);
+                       $new_type =~ s/\s+/ /g;
+                       $new_type = trim($new_type);
+                       if (WARN("UNNECESSARY_INT",
+                                "Prefer '$new_type' over '$type' as the int is unnecessary\n" . $herecurr) &&
+                           $fix) {
+                               $fixed[$fixlinenr] =~ s/\b\Q$type\E\b/$new_type/;
+                       }
+               }
+
 # check for static const char * arrays.
                if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
                        WARN("STATIC_CONST_CHAR_ARRAY",