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Date:   Fri, 14 Dec 2018 12:16:34 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Cc:     joe@perches.com, gregkh@linuxfoundation.org,
        himanshujha199640@gmail.com, apw@canonical.com,
        linux-kernel@vger.kernel.org, niklas.cassel@linaro.org,
        corbet@lwn.net, linux-doc@vger.kernel.org
Subject: Re: [PATCH 2/2] checkpatch: add Co-developed-by to signature tags
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On Fri, 14 Dec 2018 18:35:28 +0100 Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org> wrote:

> As per Documentation/process/submitting-patches, Co-developed-by is a
> valid signature.
> 

I'm with Joe - I find this tag kinda useless and duplicative.  But whatever.

But as the documentation says, Co-developed-by must be accompanied by a
Signed-off-by:.  It would be helpful if checkpatch were to detect a
failure to do this.