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checkpatch: add likely/unlikely comparison misuse test

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Add a test for probably likely/unlikely misuses where the comparison is
likely misplaced

	if (likely(foo) > 0)
vs
	if (likely(foo > 0))

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Christoph Jaeger <cj@linux.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2015-02-13 14:38:38 -08:00 committed by Linus Torvalds
parent 0d7835fcaa
commit acd9362c24
1 changed files with 7 additions and 0 deletions
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7
scripts/checkpatch.pl
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@ -5239,6 +5239,13 @@ sub process {
"#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
}
# likely/unlikely comparisons similar to "(likely(foo) > 0)"
if ($^V && $^V ge 5.10.0 &&
$line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
WARN("LIKELY_MISUSE",
"Using $1 should generally have parentheses around the comparison\n" . $herecurr);
}
# whine mightly about in_atomic
if ($line =~ /\bin_atomic\s*\(/) {
if ($realfile =~ m@^drivers/@) {