checkpatch: make email address check case insensitive
Instead of checkpatch requiring the patch author to exactly match the signed-off-by tag, commit 48ca2d8a ("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/20210816112725.173206-1-zohar@linux.ibm.comSigned-off-by: Mimi Zohar <zohar@linux.ibm.com> Acked-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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