linux-kernel - Re: [PATCH] video: fbdev: s3c-fb: Mark expected switch fall-throughs

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Message-ID: <201906251029.08B862130@keescook>
Date:   Tue, 25 Jun 2019 10:31:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joe Perches <joe@...ches.com>
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH] video: fbdev: s3c-fb: Mark expected switch fall-throughs

On Tue, Jun 25, 2019 at 09:52:23AM -0700, Joe Perches wrote:
> On Tue, 2019-06-25 at 11:01 -0500, Gustavo A. R. Silva wrote:
> > In preparation to enabling -Wimplicit-fallthrough, mark switch
> > cases where we are expecting to fall through.
> []
> > This patch is part of the ongoing efforts to enable
> > -Wimplicit-fallthrough.
> 
> Just enable the thing already.

Linus has been pretty clear about not wanting warning options enabled
without first fixing all the cases it warns about first. If that's
changed, then sure, let's do it; but we went through a lot of coordination
with sfr for linux-next nag-mail coverage (where maintainers are now
fixing it themselves) when this came up during the last kernel summit,
and this approach was the agreed solution.

-- 
Kees Cook