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checkpatch: ignore some octal permissions of 0 

module_param and create_proc uses with a permissions use of a single 0 are
"special" and should not emit any warning.

module_param uses with permission 0 are not visible in sysfs

create_proc uses with permission 0 use a default permission

Link: http://lkml.kernel.org/r/b6583611bb529ea6f6d43786827fddbabbab0a71.1513190059.git.joe@perches.com
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
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 2018-02-06 15:38:49 -08:00 committed by Linus Torvalds
parent 2e4bbbc550
commit 73121534c9
1 changed files with 7 additions and 2 deletions
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9
scripts/checkpatch.pl
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@ -6276,6 +6276,10 @@ sub process {
# Mode permission misuses where it seems decimal should be octal
# This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
# o Ignore module_param*(...) uses with a decimal 0 permission as that has a
# specific definition of not visible in sysfs.
# o Ignore proc_create*(...) uses with a decimal 0 permission as that means
# use the default permissions
if ($^V && $^V ge 5.10.0 &&
defined $stat &&
$line =~ /$mode_perms_search/) {
@ -6299,8 +6303,9 @@ sub process {
if ($stat =~ /$test/) {
my $val = $1;
$val = $6 if ($skip_args ne "");
if (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
($val =~ /^$Octal$/ && length($val) ne 4)) {
if (!($func =~ /^(?:module_param|proc_create)/ && $val eq "0") &&
(($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
($val =~ /^$Octal$/ && length($val) ne 4))) {
ERROR("NON_OCTAL_PERMISSIONS",
"Use 4 digit octal (0777) not decimal permissions\n" . "$here\n" . $stat_real);
}