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| author | Joe Perches <joe@perches.com> | 2014-12-10 15:52:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:12 -0800 |
| commit | b75ac618df751b927469ddbca63cf151a62f0f9d (patch) | |
| tree | fbc657be2fa3993e8639d5e083f4962811b025c5 /scripts | |
| parent | 90ad30e5b2a759333f06eee64e59a0d886d02036 (diff) | |
| download | linux-b75ac618df751b927469ddbca63cf151a62f0f9d.tar.gz linux-b75ac618df751b927469ddbca63cf151a62f0f9d.tar.bz2 linux-b75ac618df751b927469ddbca63cf151a62f0f9d.zip | |
checkpatch: add --strict "pointer comparison to NULL" test
It seems there are more and more uses of "if (!ptr)" in preference to "if
(ptr == NULL)" so add a --strict test to emit a message when using the
latter form.
This also finds (ptr != NULL).
Fix it too if desired.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
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 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 5e63dce2e428..6d85c7b1b27e 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -4522,6 +4522,20 @@ sub process { "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr); } +# check for pointer comparisons to NULL + if ($^V && $^V ge 5.10.0) { + while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) { + my $val = $1; + my $equal = "!"; + $equal = "" if ($4 eq "!="); + if (CHK("COMPARISON_TO_NULL", + "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/; + } + } + } + # check for bad placement of section $InitAttribute (e.g.: __initdata) if ($line =~ /(\b$InitAttribute\b)/) { my $attr = $1; |