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

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Date:   Wed, 24 Apr 2019 12:01:03 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
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,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] watchdog: machzwd: Mark expected switch fall-through

Hi Guenter,

I wonder if you took this in you watchdog-next branch.

Thanks
--
Gustavo

On 4/10/19 3:51 PM, Gustavo A. R. Silva wrote:
> 
> 
> On 4/10/19 3:35 PM, Guenter Roeck wrote:
>> On Wed, Apr 10, 2019 at 01:49:05PM -0500, 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 warnings:
>>>
>>> drivers/watchdog/machzwd.c: In function ‘zf_set_timer’:
>>> ./arch/x86/include/asm/io.h:355:14: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>>  #define outw outw
>>> drivers/watchdog/machzwd.c:80:53: note: in expansion of macro ‘outw’
>>>  #define zf_writew(port, data)  { outb(port, INDEX); outw(data, DATA_W); }
>>>                                                      ^~~~
>>> drivers/watchdog/machzwd.c:179:3: note: in expansion of macro ‘zf_writew’
>>>    zf_writew(COUNTER_1, new);
>>>    ^~~~~~~~~
>>> drivers/watchdog/machzwd.c:180:2: note: here
>>>   case WD2:
>>>   ^~~~
>>>
>>> Warning level 3 was used: -Wimplicit-fallthrough=3
>>>
>>> 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>
>>
> 
> Thank you, Guenter.
> --
> Gustavo
> 
>>> ---
>>>  drivers/watchdog/machzwd.c | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
>>> index 88d823d87a4b..108928dbc754 100644
>>> --- a/drivers/watchdog/machzwd.c
>>> +++ b/drivers/watchdog/machzwd.c
>>> @@ -177,6 +177,7 @@ static inline void zf_set_timer(unsigned short new, unsigned char n)
>>>  	switch (n) {
>>>  	case WD1:
>>>  		zf_writew(COUNTER_1, new);
>>> +		/* fall through */
>>>  	case WD2:
>>>  		zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
>>>  	default:
>>> -- 
>>> 2.21.0
>>>