diff options
| author | Joe Perches <joe@perches.com> | 2013-07-03 15:05:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:45 -0700 |
| commit | 179f8f40fc3ae7cd49e96b3a7d5182166c36bdab (patch) | |
| tree | b2660986886bf926f82efd7960b40db57c0f350c /scripts | |
| parent | 77b9a53a627491df83a75361440485629c35aa91 (diff) | |
| download | lwn-179f8f40fc3ae7cd49e96b3a7d5182166c36bdab.tar.gz lwn-179f8f40fc3ae7cd49e96b3a7d5182166c36bdab.zip | |
checkpatch: add a --strict test for comparison to true/false
Comparing to true or false is error prone.
Add tests for the various forms of (foo == true) && (false != bar)
that are only reported with --strict.
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>
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/checkpatch.pl | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index c43be815cc71..c2d223c406e8 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -3588,6 +3588,33 @@ sub process { "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n" . $herecurr); } +# check for comparisons against true and false + if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) { + my $lead = $1; + my $arg = $2; + my $test = $3; + my $otype = $4; + my $trail = $5; + my $op = "!"; + + ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i); + + my $type = lc($otype); + if ($type =~ /^(?:true|false)$/) { + if (("$test" eq "==" && "$type" eq "true") || + ("$test" eq "!=" && "$type" eq "false")) { + $op = ""; + } + + CHK("BOOL_COMPARISON", + "Using comparison to $otype is error prone\n" . $herecurr); + +## maybe suggesting a correct construct would better +## "Using comparison to $otype is error prone. Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr); + + } + } + # check for semaphores initialized locked if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) { WARN("CONSIDER_COMPLETION", |