checkpatch: verify SPDX comment style

Using SPDX commenting style // or /* is specified for various file types
in Documentation/process/license-rules.rst so add an appropriate test for
.[chsS] files because many proposed file additions and patches do not use
the correct style.

Link: http://lkml.kernel.org/r/8b02899853247a2c67669561761f354dd3bd110e.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b737ca9d7204..c17cbc06911f 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3037,6 +3037,14 @@ sub process {
                                         $comment = '..';
                                 }
 
+# check SPDX comment style for .[chsS] files
+                                if ($realfile =~ /\.[chsS]$/ &&
+                                    $rawline =~ /SPDX-License-Identifier:/ &&
+                                    $rawline !~ /^\+\s*\Q$comment\E\s*/) {
+                                        WARN("SPDX_LICENSE_TAG",
+                                             "Improper SPDX comment style for '$realfile', please use '$comment' instead\n" . $herecurr);
+                                }
+
                                 if ($comment !~ /^$/ &&
                                     $rawline !~ /^\+\Q$comment\E SPDX-License-Identifier: /) {
                                          WARN("SPDX_LICENSE_TAG",