linux-kernel - Re: [PATCH] watchdog: pcwd_pci: mark expected switch fall-through

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Message-ID: <20171103155426.GA21990@roeck-us.net>
Date:   Fri, 3 Nov 2017 08:54:26 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Wim Van Sebroeck <wim@...ana.be>
Cc:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: pcwd_pci: mark expected switch fall-through

On Fri, Nov 03, 2017 at 04:04:23PM +0100, Wim Van Sebroeck wrote:
> Hi Gustavo,
> 
> > In preparation to enabling -Wimplicit-fallthrough, mark switch cases
> > where we are expecting to fall through.
> > 
> > Notice that in this particular case I replaced "Fall" with a proper
> > "fall through" comment, which is what GCC is expecting to find.
> > 
> > Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
> > ---
> >  drivers/watchdog/pcwd_pci.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/watchdog/pcwd_pci.c b/drivers/watchdog/pcwd_pci.c
> > index c0d07ee..c882252 100644
> > --- a/drivers/watchdog/pcwd_pci.c
> > +++ b/drivers/watchdog/pcwd_pci.c
> > @@ -545,7 +545,7 @@ static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
> >  			return -EINVAL;
> >  
> >  		pcipcwd_keepalive();
> > -		/* Fall */
> > +		/* fall through */
> >  	}
> >  
> >  	case WDIOC_GETTIMEOUT:
> > -- 
> > 2.7.4
> > 
> 
> Shouldn't the /* fall through */ come after the } ?
> 
Good question. This is an unconditional code block needed to declare
a local variable within the case statement. What is correct in that
situation ?

Guenter