linux-kernel - Re: [PATCH] mmc: atmel-mci: Mark expected switch fall-throughs

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Message-ID: <201907310905.B90C6E25@keescook>
Date:   Wed, 31 Jul 2019 09:06:07 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] mmc: atmel-mci: Mark expected switch fall-throughs

On Wed, Jul 31, 2019 at 01:32:16PM +0200, Ludovic Desroches wrote:
> > drivers/mmc/host/atmel-mci.c:2426:40: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    host->caps.need_notbusy_for_read_ops = 1;
> >    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
> > drivers/mmc/host/atmel-mci.c:2427:2: note: here
> >   case 0x100:
> >   ^~~~
> > 
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> 
> I don't know if there is a policy in the kernel about the expression to
> use. As this one does the job

Yup, documented here:
https://www.kernel.org/doc/html/latest/process/deprecated.html#implicit-switch-case-fall-through

> Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>

Thanks!

-- 
Kees Cook