checkpatch: try to avoid poor patch subject lines

Naming the tool that found an issue in the subject line isn't very useful.
 Emit a warning when a common tool (currently checkpatch, sparse or
smatch) is in the subject line.

Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3642b0d5ad6a..9c720e1261e9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2170,6 +2170,13 @@ sub process {
                         }
                 }
 
+# Check email subject for common tools that don't need to be mentioned
+                if ($in_header_lines &&
+                    $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
+                        WARN("EMAIL_SUBJECT",
+                             "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
+                }
+
 # Check for old stable address
                 if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) {
                         ERROR("STABLE_ADDRESS",