checkpatch: improve "no space after cast" test

Some false positives exist on this test.

For instance:
	*va_arg(args, signed char *) = val.s;
or
	memset(foo, 0, sizeof(struct bar *) * baz));

Ignore lines that have an arithmetic operator or assignment
after what appears to be a cast to a pointer "(foo *)".

Add $Arithmetic convenience variable.

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 c2d223c..ab39ceb 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -241,10 +241,11 @@ our $Float        = qr{$Float_hex|$Float_dec|$Float_int};
 our $Constant  = qr{$Float|$Binary|$Hex|$Int};
 our $Assignment        = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 our $Compare    = qr{<=|>=|==|!=|<|>};
+our $Arithmetic = qr{\+|-|\*|\/|%};
 our $Operators = qr{
                        <=|>=|==|!=|
                        =>|->|<<|>>|<|>|!|~|
-                       &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
+                       &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
                  }x;
 
 our $NonptrType;
@@ -1885,7 +1886,7 @@ sub process {
                        }
                }
 
-               if ($line =~ /^\+.*\*[ \t]*\)[ \t]+/) {
+               if ($line =~ /^\+.*\*[ \t]*\)[ \t]+(?!$Assignment|$Arithmetic)/) {
                        CHK("SPACING",
                            "No space is necessary after a cast\n" . $hereprev);
                }