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checkpatch: Warn on improper usage of Co-developed-by

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The purpose of Co-developed-by: is to give attribution to authors who
aren't already attributed by the From: tag, i.e. who aren't the nominal
patch author.  Because Co-developed-by: is essentially a variation of
From:, it must be accompanied by a Signed-off-by: of the associated
co-author.  To ease the burden of determining whether or not co-authors
have signed off, Co-developed-by and Signed-off-by: must be explicitly
paired, i.e. on consecutive lines for a given co-author.

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Sean Christopherson 2019-03-22 14:11:37 -07:00 committed by Jonathan Corbet
parent c55760806d
commit 6c5d24eef7
1 changed files with 18 additions and 0 deletions
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18
scripts/checkpatch.pl
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@ -2687,6 +2687,24 @@ sub process {
} else {
$signatures{$sig_nospace} = 1;
}
# 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 (!defined $lines[$linenr]) {
WARN("BAD_SIGN_OFF",
"Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline);
} elsif ($rawlines[$linenr] !~ /^\s*signed-off-by:\s*(.*)/i) {
WARN("BAD_SIGN_OFF",
"Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
} elsif ($1 ne $email) {
WARN("BAD_SIGN_OFF",
"Co-developed-by and Signed-off-by: name/email do not match \n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
}
}
}
# Check email subject for common tools that don't need to be mentioned