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authorJoe Perches <joe@perches.com>2014-01-23 15:54:47 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:58 -0800
commit189248d8f4f3ac2fba30da9b40133b5891df95fc (patch)
tree8c1f512c32463c29de4792b17a30822555cdbc76 /scripts
parentc76f4cb3d25e5dc84017d7e845072e9aef6037f4 (diff)
downloadlinux-189248d8f4f3ac2fba30da9b40133b5891df95fc.tar.gz
checkpatch: check for if's with unnecessary parentheses
If statements don't need multiple parentheses around tested comparisons like "if ((foo == bar))". An == comparison maybe a sign of an intended assignment, so emit a slightly different message if so. Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl14
1 files changed, 14 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3e0b3f4d342..57f10db4acc 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3254,6 +3254,20 @@ sub process {
}
}
+# if statements using unnecessary parentheses - ie: if ((foo == bar))
+ if ($^V && $^V ge 5.10.0 &&
+ $line =~ /\bif\s*((?:\(\s*){2,})/) {
+ my $openparens = $1;
+ my $count = $openparens =~ tr@\(@\(@;
+ my $msg = "";
+ if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
+ my $comp = $4; #Not $1 because of $LvalOrFunc
+ $msg = " - maybe == should be = ?" if ($comp eq "==");
+ WARN("UNNECESSARY_PARENTHESES",
+ "Unnecessary parentheses$msg\n" . $herecurr);
+ }
+ }
+
# Return of what appears to be an errno should normally be -'ve
if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
my $name = $1;