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Date: Tue, 09 Apr 2013 20:17:14 -0700
From: Joe Perches <joe@...ches.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Whitcroft <apw@...dowen.org>,
LKML <linux-kernel@...r.kernel.org>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH] checkpatch: Warn on comparisons to true and false
Comparisons of A to true and false are better written
as A and !A.
Bleat a message on use.
Signed-off-by: Joe Perches <joe@...ches.com>
---
scripts/checkpatch.pl | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3fb6d86..080e7f6 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3538,6 +3538,23 @@ 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*(.*?)($Lval)\s*(==|\!=)\s*(true|false)\b(.*)$/i) {
+ my $lead = $1;
+ my $arg = $2;
+ my $test = $3;
+ my $otype = $4;
+ my $trail = $5;
+ my $type = lc($otype);
+ my $op = "!";
+ if (("$test" eq "==" && "$type" eq "true") ||
+ ("$test" eq "!=" && "$type" eq "false")) {
+ $op = "";
+ }
+ WARN("BOOL_COMPARISON",
+ "Using comparison to $otype is poor style. Use '${lead}${op}${arg}${trail}'\n" . $herecurr);
+ }
+
# check for semaphores initialized locked
if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
WARN("CONSIDER_COMPLETION",
--
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