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| author | Joe Perches <joe@perches.com> | 2015-02-13 14:38:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-13 21:21:39 -0800 |
| commit | acd9362c248e33187629c950badb834b73e20e41 (patch) | |
| tree | 906c5686169c07b1849fe49426b72a57c01f26c9 /scripts/checkpatch.pl | |
| parent | 0d7835fcaa67bb21e5ffd50afaa65c81c53f8856 (diff) | |
| download | lwn-acd9362c248e33187629c950badb834b73e20e41.tar.gz lwn-acd9362c248e33187629c950badb834b73e20e41.zip | |
checkpatch: add likely/unlikely comparison misuse test
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>
Diffstat (limited to 'scripts/checkpatch.pl')
| -rwxr-xr-x | scripts/checkpatch.pl | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 786017d4d057..41223c946808 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -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/@) { |