linux-hardening - Re: [PATCH 057/141] watchdog: Fix fall-through warnings for Clang

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Message-ID: <20201123225042.GO21644@embeddedor>
Date:   Mon, 23 Nov 2020 16:50:42 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 057/141] watchdog: Fix fall-through warnings for Clang

On Sat, Nov 21, 2020 at 10:49:51AM -0800, Guenter Roeck wrote:
> On Fri, Nov 20, 2020 at 12:32:51PM -0600, Gustavo A. R. Silva wrote:
> > In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
> > by explicitly adding a fallthrough pseudo-keyword instead of letting the
> > code fall through to the next case.
> > 
> > Link: https://github.com/KSPP/linux/issues/115
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> > ---
> >  drivers/watchdog/machzwd.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
> > index 743377c5b173..73f2221f6222 100644
> > --- a/drivers/watchdog/machzwd.c
> > +++ b/drivers/watchdog/machzwd.c
> > @@ -174,6 +174,7 @@ static inline void zf_set_timer(unsigned short new, unsigned char n)
> >  		fallthrough;
> >  	case WD2:
> >  		zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
> > +		fallthrough;
> 
> fallthrough to return ? Oh well, this is an old style driver anyway,
> so I guess who cares.

:)

> Acked-by: Guenter Roeck <linux@...ck-us.net>

Thanks, Guenter.
--
Gustavo