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checkpatch: add a --strict test for comparison to true/false

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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>
This commit is contained in:
Joe Perches 2013-07-03 15:05:30 -07:00 committed by Linus Torvalds
parent 77b9a53a62
commit 179f8f40fc
1 changed files with 27 additions and 0 deletions
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27
scripts/checkpatch.pl
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@ -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",