linux-kernel - commit tag order vs. "b4 am"

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Message-ID: <Zbl5XvzpqND9exmW@agluck-desk3>
Date: Tue, 30 Jan 2024 14:34:06 -0800
From: Tony Luck <tony.luck@...el.com>
To: x86@...nel.org
Cc: Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
	Reinette Chatre <reinette.chatre@...el.com>,
	linux-kernel@...r.kernel.org
Subject: commit tag order vs. "b4 am"

Reinette noticed that v14 of my resctrl/SNC patch series[1] did not adhere
to the tag order proscribed in Documentation/process/maintainer-tip.rst
Specifically my "Signed-off-by:" was now the last tag, instead of
appearing before the "Reviewed-by:" and "Tested-by" tags as it had in
v13.

A little digging showed that my tag had been moved to the end by "b4 am"
when I used it to pick up some additonal tags.

An e-mail discussion with Konstantin ensued to determine if this was
a bug. Konstantin said:

   This is the intended behaviour, because b4 follows the chain-of-custody
   procedure. If we encounter a Signed-off-by trailer matching the identity of
   the user preparing the series, we move it to the bottom to indicate that the
   chain-of-custody boundary has moved to include the code review trailers
   received after the initial submission.

   https://lore.kernel.org/tools/20221031165842.vxr4kp6h7qnkc53l@meerkat.local/

   Basically, the "Signed-off-by" trailer is special because it indicates that
   everything above it is the responsibility of the person doing the sign-off. If
   we kept your Signed-off-by in the original spot, then it wouldn't be clear who
   collected and applied the trailers.

Question: Do the TIP maintainers agree with Konstantin's opinion that
the Signed-off-by: includes all the tags applied prior? If so, this
should be called out in Documentation/process/maintainer-tip.rst

[1] https://lore.kernel.org/all/20240126223837.21835-1-tony.luck@intel.com/