linux-kernel - Re: [PATCH 2/4] dell-wmi: Sort WMI event codes and update comments

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Date:	Wed, 8 Jun 2016 13:15:18 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Michał Kępień <kernel@...pniu.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Mario Limonciello <mario_limonciello@...l.com>,
	Andy Lutomirski <luto@...nel.org>,
	Alex Hung <alex.hung@...onical.com>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] dell-wmi: Sort WMI event codes and update comments

On Wed, Jun 08, 2016 at 09:57:26PM +0200, Pali Rohár wrote:
> On Wednesday 08 June 2016 21:48:24 Darren Hart wrote:
> > On Wed, Jun 08, 2016 at 12:03:24AM +0200, Pali Rohár wrote:
> > > On Thursday 02 June 2016 12:41:42 Michał Kępień wrote:
> > > > > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > > > 
> > > > My guess is that Darren won't let you off without at least a
> > > > short commit message.
> > > 
> > > I have no idea what else to write. I think that description is
> > > enough.
> > 
> > There is always something. For example, why? See
> > Documentation/SubmittingPatches section "14) The canonical patch
> > format" for an explanation.
> > 
> > "Traceability" of changes is important. If it's worth preparing the
> > patch, it's worth documenting why.
> 
> In my opinion current description is enough and cover everything what 
> this patch is doing. I think it is clear from my description what this 
> patch is doing and so it is documented.
> 
> But if it is not clear and something is missing, let me know or show 
> what is wrong and how you change it... It is just my assumption that 
> "Sort WMI event codes and update comments" is clear...

The patch summary accurately states what it does. It does not explain why it
does it, or why it is necessary. I understand this is a trivial change, but also
understand that both maintainers and people doing maintenance and regression
analysis will appreciate understanding the motivation and intent of the patch,
in addition to the content of the patch.

>From the maintainer perspective, whether we have 20 or 200 patches to review, we
will naturally merge the ones that require the least effort first. This
maximizes our efficiency and benefits the most people with what time we have
available. For many of us, this is our nights and weekends (guessing that's the
case for you as well). It is in the submitter's best interest to take the time
document the why, what, and how of each patch in a way that minimizes the effort
on the part of the maintainer to decide if the patch should be merged. It is
also a matter of scale, if every patch conforms to these guidelines, the
workflow is much more efficient.

In this case, I don't know why you decided to sort the event codes or update the
comments. I assume the comments were wrong before, but maybe something changed.
Do you care about alphabetically order or optimizing the switch statements? Is
it purely for legibility? Etc.

If that isn't sufficient, then just do it out of self-interest, because I will
not send patches to Linus that do not provide both a summary and a description
in the commit which meet the guidelines of section 14 referenced above.

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center