checkpatch: add test for SPDX-License-Identifier on wrong line #

Warn when any SPDX-License-Identifier: tag is not created on the proper
line number.

Link: http://lkml.kernel.org/r/9b74ee87f8c1b8fd310e213fcb4994d58610fcb6.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index cbbeb38..8d8d26b 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3073,6 +3073,14 @@ sub process {
 # check we are in a valid source file if not then ignore this hunk
                next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);
 
+# check for using SPDX-License-Identifier on the wrong line number
+               if ($realline != $checklicenseline &&
+                   $rawline =~ /\bSPDX-License-Identifier:/ &&
+                   substr($line, @-, @+ - @-) eq "$;" x (@+ - @-)) {
+                       WARN("SPDX_LICENSE_TAG",
+                            "Misplaced SPDX-License-Identifier tag - use line $checklicenseline instead\n" . $herecurr);
+               }
+
 # line length limit (with some exclusions)
 #
 # There are a few types of lines that may extend beyond $max_line_length: