linux-kernel - Re: [PATCH] watchdog: alim7101: Mark expected switch fall-through

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Message-ID: <20190405205555.GA20974@roeck-us.net>
Date:   Fri, 5 Apr 2019 13:55:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] watchdog: alim7101: Mark expected switch fall-through

On Fri, Apr 05, 2019 at 01:04:27PM -0500, Gustavo A. R. Silva wrote:
> Hi all,
> 
> Friendly ping:
> 
> Who can take this?

I added it to my watchdog-next branch. Usually Wim will pick it up from there.

Guenter

> 
> Thanks
> --
> Gustavo
> 
> On 3/20/19 7:15 PM, Gustavo A. R. Silva wrote:
> > 
> > 
> > On 3/20/19 7:12 PM, Guenter Roeck wrote:
> >> On 3/20/19 11:16 AM, Gustavo A. R. Silva wrote:
> >>> In preparation to enabling -Wimplicit-fallthrough, mark switch
> >>> cases where we are expecting to fall through.
> >>>
> >>> This patch fixes the following warning:
> >>>
> >>> drivers/watchdog/alim7101_wdt.c: In function ‘fop_ioctl’:
> >>> drivers/watchdog/alim7101_wdt.c:279:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >>>     wdt_keepalive();
> >>>     ^~~~~~~~~~~~~~~
> >>> drivers/watchdog/alim7101_wdt.c:282:2: note: here
> >>>    case WDIOC_GETTIMEOUT:
> >>>    ^~~~
> >>>
> >>> Notice that, in this particular case, the /* Fall through */
> >>> comment is placed at the very bottom of the case statement,
> >>> which is what GCC is expecting to find.
> >>>
> >>> Warning level 3 was used: -Wimplicit-fallthrough=3
> >>>
> >>> This patch is part of the ongoing efforts to enabling
> >>> -Wimplicit-fallthrough.
> >>>
> >>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> >>
> >> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> >>
> > 
> > Thanks, Guenter. :)
> > 
> > --
> > Gustavo
> > 
> >>> ---
> >>>   drivers/watchdog/alim7101_wdt.c | 2 +-
> >>>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/watchdog/alim7101_wdt.c b/drivers/watchdog/alim7101_wdt.c
> >>> index 12f7ea62dddd..f5ada07e9202 100644
> >>> --- a/drivers/watchdog/alim7101_wdt.c
> >>> +++ b/drivers/watchdog/alim7101_wdt.c
> >>> @@ -277,8 +277,8 @@ static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> >>>               return -EINVAL;
> >>>           timeout = new_timeout;
> >>>           wdt_keepalive();
> >>> -        /* Fall through */
> >>>       }
> >>> +        /* Fall through */
> >>>       case WDIOC_GETTIMEOUT:
> >>>           return put_user(timeout, p);
> >>>       default:
> >>>
> >>