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Date:   Fri, 22 Mar 2019 14:11:37 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jonathan Corbet <corbet@....net>,
        Andy Whitcroft <apw@...onical.com>,
        Joe Perches <joe@...ches.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Tobin C . Harding" <me@...in.cc>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Niklas Cassel <niklas.cassel@...aro.org>
Subject: [PATCH v5 2/2] checkpatch: Warn on improper usage of Co-developed-by

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@...ches.com>
Cc: Tobin C. Harding <me@...in.cc>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Cc: Jonathan Cameron <jic23@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Niklas Cassel <niklas.cassel@...aro.org>
Cc: Jonathan Corbet <corbet@....net>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 scripts/checkpatch.pl | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5b756278df13..bbe71f017f6d 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -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
-- 
2.21.0

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