checkpatch: update octal permissions warning

When checking permissions, make sure 4 octal digits are used, but allow
a single 0 too.

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>

1 files changed, 4 insertions, 2 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1054283c6e70..9f12213d81cf 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4512,9 +4512,11 @@ sub process {
                                 my $val = $1;
                                 $val = $6 if ($skip_args ne "");
 
-                                if ($val =~ /^$Int$/ && $val !~ /^$Octal$/) {
+                                if ($val !~ /^0$/ &&
+                                    (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
+                                     length($val) ne 4)) {
                                         ERROR("NON_OCTAL_PERMISSIONS",
-                                              "Use octal not decimal permissions\n" . $herecurr);
+                                              "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
                                 }
                         }
                 }