The patch titled
Subject: checkpatch: add --strict "pointer comparison to NULL" test
has been added to the -mm tree. Its filename is
checkpatch-add-strict-pointer-comparison-to-null-test.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/checkpatch-add-strict-pointer-comparison-to-null-test.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/checkpatch-add-strict-pointer-comparison-to-null-test.patch
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*** 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 --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@xxxxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/checkpatch.pl | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff -puN scripts/checkpatch.pl~checkpatch-add-strict-pointer-comparison-to-null-test scripts/checkpatch.pl
--- a/scripts/checkpatch.pl~checkpatch-add-strict-pointer-comparison-to-null-test
+++ a/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;
_
Patches currently in -mm which might be from joe@xxxxxxxxxxx are
printk-remove-used-once-early_vprintk.patch
tile-neaten-early_printk-uses.patch
tile-use-pr_warn-instead-of-pr_warning.patch
printk-add-and-use-loglevel_level-defines-for-kern_level-equivalents.patch
maintainers-update-ivtv-mailing-lists-as-subscriber-only.patch
mm-utilc-add-kstrimdup.patch
checkpatch-add-an-error-test-for-no-space-before-comma.patch
checkpatch-add-error-on-use-of-attributeweak-or-__weak-declarations.patch
checkpatch-improve-test-for-no-space-after-cast.patch
checkpatch-improve-warning-message-for-needless-if-case.patch
checkpatch-fix-use-via-symlink-make-missing-spelling-file-non-fatal.patch
checkpatch-try-to-avoid-mask-and-shift-errors.patch
checkpatch-reduce-maintainers-update-message-frequency.patch
checkpatch-add-strict-test-for-function-pointer-calling-style.patch
checkpatch-allow-certain-si-units-with-three-characters.patch
checkpatch-add-strict-preference-for-defines-using-bitfoo.patch
checkpatch-add-test-for-consecutive-string-fragments.patch
checkpatch-add-strict-pointer-comparison-to-null-test.patch
binfmt_misc-add-comments-debug-logs.patch
binfmt_misc-clean-up-code-style-a-bit.patch
fs-binfmt_miscc-use-gfp_kernel-instead-of-gfp_user.patch
fs-affs-amigaffsc-use-va_format-instead-of-buffer-vnsprintf.patch
linux-next.patch
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