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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 8 Feb 2023 16:46:03 -0800
Message-ID: <CAHk-=wg_E5qAOTtZ6BSJph1zDN7Unzw_ct8wK1pr+E8HTnooRw@mail.gmail.com>
Subject: Re: [PATCH] drivers/core: Replace lockdep_set_novalidate_class() with
 unique class keys
To:     Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc:     Alan Stern <stern@rowland.harvard.edu>,
        syzkaller <syzkaller@googlegroups.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        LKML <linux-kernel@vger.kernel.org>,
        USB list <linux-usb@vger.kernel.org>,
        Hillf Danton <hdanton@sina.com>
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On Wed, Feb 8, 2023 at 4:23 PM Tetsuo Handa
<penguin-kernel@i-love.sakura.ne.jp> wrote:
>
> Did I misuse the Co-developed-by: tag? I added your Signed-off-by: tag because
> https://docs.kernel.org/process/submitting-patches.html#when-to-use-acked-by-cc-and-co-developed-by
> states that "every Co-developed-by: must be immediately followed by a Signed-off-by:
> of the associated co-author."

That doesn't mean that *You* can add a Signed-off-by:

Nobody can certify sign-off for anybody else. Read the sign-off rules:
you can add your *own* sign-off if the rules hold, but you can't sign
off for somebody else.

The "Co-developed-by: must be immediately followed by a
Signed-off-by:" thing only means that if there are multiple
developers, then ALL DEVELOPERS MUST SIGN OFF.

It absolutely does *NOT* mean that you adding a Co-developed-by means
that you then add a Signed-off-by.

That's like faking somebody else's signature on some paperwork. Never
do that either, and it's hopefully obvious why.

                  Linus