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

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Date:   Wed, 20 Mar 2019 19:15:07 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        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: alim7101: Mark expected switch fall-through



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:
>>
>