Currently, checkpatch warns us if the author of the commit signs-off
as co-developed-by.
E.g. for commit 6e88559470f5 ("Documentation: Add section about
CPU vulnerabilities for Spectre") we get:

WARNING: Co-developed-by: should not be used to attribute nominal
patch author 'Tim Chen [off-list ref]'
Co-developed-by: Tim Chen <redacted>

Provide a simple fix by removing the co-developed-by line from the
commit message

A quick evaluation on v4.13..v5.8 showed that this fix was getting
triggered 6 times.
A quick manual check found out that all fixes were correct in those
cases.

Signed-off-by: Aditya Srivastava <redacted>
---
 scripts/checkpatch.pl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 58095d9d8f34..1030d4fc2abf 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl

@@ -2827,8 +2827,11 @@ sub process {
 # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
 			if ($sign_off =~ /^co-developed-by:$/i) {
 				if ($email eq $author) {
-					WARN("BAD_SIGN_OFF",
-					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
+					if (WARN("BAD_SIGN_OFF",
+						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
+					    $fix) {
+						fix_delete_line($fixlinenr, $rawline);
+					}
 				}
 				if (!defined $lines[$linenr]) {
 					WARN("BAD_SIGN_OFF",

-- 
2.17.1

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