checkpatch: add spell checking of email subject line

Only commit log and patch additions are checked for typos and spelling
errors currently.  Add a check of the email subject line too.

Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Jani Nikula <jani.nikula@linux.intel.com>
Tested-by: Jani Nikula <jani.nikula@intel.com>
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 421bbb4..c061a63 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2303,7 +2303,8 @@ sub process {
                }
 
 # Check for various typo / spelling mistakes
-               if (defined($misspellings) && ($in_commit_log || $line =~ /^\+/)) {
+               if (defined($misspellings) &&
+                   ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
                        while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:$|[^a-z@])/gi) {
                                my $typo = $1;
                                my $typo_fix = $spelling_fix{lc($typo)};