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

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Message-ID: <707a1c55-c185-1227-0a65-136f3bf27617@embeddedor.com>
Date:   Wed, 10 Apr 2019 15:51:19 -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
Subject: Re: [PATCH] watchdog: machzwd: Mark expected switch fall-through



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
>>