linux-kernel - Re: [PATCH] watchdog: smsc37b787_wdt: Mark expected switch fall-through

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Date:   Mon, 18 Feb 2019 08:08:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] watchdog: smsc37b787_wdt: Mark expected switch
 fall-through

On 2/14/19 12:16 PM, 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/smsc37b787_wdt.c: In function ‘wb_smsc_wdt_ioctl’:
> drivers/watchdog/smsc37b787_wdt.c:480:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     wb_smsc_wdt_set_timeout(timeout);
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/watchdog/smsc37b787_wdt.c:482:2: note: here
>    case WDIOC_GETTIMEOUT:
>    ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Notice that, in this particular case, the code comment is modified
> in accordance with what GCC is expecting to find.
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

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

> ---
>   drivers/watchdog/smsc37b787_wdt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c
> index 445ea1ad1fa9..c768dcd53034 100644
> --- a/drivers/watchdog/smsc37b787_wdt.c
> +++ b/drivers/watchdog/smsc37b787_wdt.c
> @@ -478,7 +478,7 @@ static long wb_smsc_wdt_ioctl(struct file *file,
>   			return -EINVAL;
>   		timeout = new_timeout;
>   		wb_smsc_wdt_set_timeout(timeout);
> -		/* fall through and return the new timeout... */
> +		/* fall through - and return the new timeout... */
>   	case WDIOC_GETTIMEOUT:
>   		new_timeout = timeout;
>   		if (unit == UNIT_MINUTE)
>