[125/147] checkpatch: make email address check case insensitive

Commit Message

Andrew Morton Sept. 8, 2021, 2:59 a.m. UTC

From: Mimi Zohar <[e-mail]>
Subject: checkpatch: make email address check case insensitive

Instead of checkpatch requiring the patch author to exactly match the
signed-off-by tag, commit 48ca2d8ac8a1 ("checkpatch: add new warnings to
author signoff checks.") safely relaxed this requirement.

Although the local-part of an email address (local-part@domain), may be
case sensitive, exploiting the case sensitivity of mailbox local-parts
impedes interoperability and is discouraged.  Mailbox domains follow
normal DNS rules and are hence not case sensitive.  (Refer to
https://datatracker.ietf.org/doc/html/rfc5321#section-2.4.)

Further relax the patch author and signed-off-by tag comparison by making
the email address check case insensitive.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Mimi Zohar <[e-mail]>
Acked-by: Joe Perches <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 scripts/checkpatch.pl |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

--- a/scripts/checkpatch.pl~checkpatch-make-email-address-check-case-insensitive
+++ a/scripts/checkpatch.pl
@@ -2909,10 +2909,10 @@  sub process {
 					my ($email_name, $email_comment, $email_address, $comment1) = parse_email($ctx);
 					my ($author_name, $author_comment, $author_address, $comment2) = parse_email($author);
 
-					if ($email_address eq $author_address && $email_name eq $author_name) {
+					if (lc $email_address eq lc $author_address && $email_name eq $author_name) {
 						$author_sob = $ctx;
 						$authorsignoff = 2;
-					} elsif ($email_address eq $author_address) {
+					} elsif (lc $email_address eq lc $author_address) {
 						$author_sob = $ctx;
 						$authorsignoff = 3;
 					} elsif ($email_name eq $author_name) {