linux-kernel - Re: [GIT PULL] pwm: Changes for v5.11-rc1

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Date:   Sat, 19 Dec 2020 11:51:18 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        linux-pwm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] pwm: Changes for v5.11-rc1

On Fri, Dec 18, 2020 at 4:57 PM Thierry Reding <thierry.reding@...il.com> wrote:
>
> I didn't realize that this would show up as all new commits. The reason
> why this happens is because the first commit in the tree is a fix for an
> issue for which Uwe had sent an alternative patch to you directly for
> inclusion in v5.10.
>
> After going over the patches again as I was preparing the pull request,
> I realized that the commit message was no longer accurate, so I changed
> the commit message of the first commit, which then caused all of the
> subsequent patches (i.e. all of them) to be rewritten.

Ok, when you do things like this, please mention it in the pull
request so that I can see why history has been changed.

In general, I'm not sure it's worth changing commit messages unless
they are just *horribly* bad. That's a gray area, of course, so
there's no hard rule about when to do it. If it's just "not really
true any more", I'd say let it go. If it's a horrible mess that will
be very misleading if people start looking at that commit, then yeah,
go ahead and fix up it, but remember that you _are_ changing history.

Changing history _can_ have good reasons. But particularly when they
happen just before a pull request, please please PLEASE make it clear
in the pull what happened.

            Linus