Subject: + checkpatch-add-a-strict-test-for-comparison-to-true-false.patch added to -mm tree To: joe@xxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Tue, 11 Jun 2013 15:50:41 -0700 The patch titled Subject: checkpatch: add a --strict test for comparison to true/false has been added to the -mm tree. Its filename is checkpatch-add-a-strict-test-for-comparison-to-true-false.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Joe Perches <joe@xxxxxxxxxxx> Subject: 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@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- scripts/checkpatch.pl | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff -puN scripts/checkpatch.pl~checkpatch-add-a-strict-test-for-comparison-to-true-false scripts/checkpatch.pl --- a/scripts/checkpatch.pl~checkpatch-add-a-strict-test-for-comparison-to-true-false +++ a/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", _ Patches currently in -mm which might be from joe@xxxxxxxxxxx are linux-next.patch checkpatch-change-camelcase-test-and-make-it-strict.patch checkpatch-warn-when-using-gccs-binary-constant-extension.patch checkpatch-add-strict-preference-for-p-=-kmallocsizeofp.patch checkpatch-remove-quote-from-camelcase-test.patch checkpatch-improve-network-block-comment-test-and-message.patch checkpatch-warn-when-networking-block-comment-lines-dont-start-with.patch checkpatch-warn-on-comparisons-to-jiffies.patch checkpatch-warn-on-comparisons-to-get_jiffies_64.patch checkpatch-reduce-false-positive-rate-of-complex-macros.patch checkpatch-add-a-placeholder-to-check-blank-lines-before-declarations.patch checkpatch-dont-warn-on-blank-lines-before-after-braces-as-often.patch checkpatch-add-a-strict-test-for-comparison-to-true-false.patch checkpatch-improve-no-space-after-cast-test.patch checkpatch-create-an-experimental-fix-option-to-correct-patches.patch checkpatch-move-test-for-space-before-semicolon-after-operator-spacing.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html