Recently signature tag Co-Developed-by was added to the
kernel (Documentation/process/5.Posting.rst). checkpatch.pl doesn't know
about it yet. All prior tags used all lowercase characters except for first
character. Checks for this format had to be re-worked to allow for the
new tag.

Add checkpatch checks for Co-Developed-by tag.

Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Tobin C. Harding <m...@tobin.cc>
---
 scripts/checkpatch.pl | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 040aa79e1d9d..a7d2cdcec6a6 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -468,6 +468,7 @@ our $signature_tags = qr{(?xi:
        Reviewed-by:|
        Reported-by:|
        Suggested-by:|
+       Co-Developed-by:|
        To:|
        Cc:
 )};
@@ -2468,6 +2469,8 @@ sub process {
                        my $space_after = $3;
                        my $email = $4;
                        my $ucfirst_sign_off = ucfirst(lc($sign_off));
+                       my $preferred_signature = "";
+                       my $co_dev_by_tag = 'Co-Developed-by:';
 
                        if ($sign_off !~ /$signature_tags/) {
                                WARN("BAD_SIGN_OFF",
@@ -2481,15 +2484,22 @@ sub process {
                                            "$ucfirst_sign_off $email";
                                }
                        }
-                       if ($sign_off =~ /-by:$/i && $sign_off ne 
$ucfirst_sign_off) {
-                               if (WARN("BAD_SIGN_OFF",
-                                        "'$ucfirst_sign_off' is the preferred 
signature form\n" . $herecurr) &&
-                                   $fix) {
-                                       $fixed[$fixlinenr] =
-                                           "$ucfirst_sign_off $email";
+                       if ($sign_off =~ /$co_dev_by_tag$/i) {
+                               if ($sign_off ne $co_dev_by_tag) {
+                                       $preferred_signature = $co_dev_by_tag;
                                }
+                       } elsif ($sign_off =~ /-by:$/i && $sign_off ne 
$ucfirst_sign_off) {
+                               $preferred_signature = $ucfirst_sign_off;
 
                        }
+
+                       if ($preferred_signature ne "") {
+                               my $prefix = "'$preferred_signature' is the 
preferred signature form\n";
+                               if (WARN("BAD_SIGN_OFF", $prefix . $herecurr) 
&& $fix) {
+                                       $fixed[$fixlinenr] = "$ucfirst_sign_off 
$email";
+                               }
+                       }
+
                        if (!defined $space_after || $space_after ne " ") {
                                if (WARN("BAD_SIGN_OFF",
                                         "Use a single space after 
$ucfirst_sign_off\n" . $herecurr) &&
-- 
2.7.4

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