Re: [PATCH] ata: pata_cs5535: Fix W=1 warnings

[Sergey Shtylyov]

Hello!

On 6/28/22 11:59 AM, Damien Le Moal wrote:
[...]
>> x86_64 allmodconfig build with W=1 gives these warnings:
>>
>> drivers/ata/pata_cs5535.c: In function ‘cs5535_set_piomode’:
>> drivers/ata/pata_cs5535.c:93:11: error: variable ‘dummy’ set but not used [-Werror=unused-but-set-variable]
>>   u32 reg, dummy;
>>            ^~~~~
>> drivers/ata/pata_cs5535.c: In function ‘cs5535_set_dmamode’:
>> drivers/ata/pata_cs5535.c:132:11: error: variable ‘dummy’ set but not used [-Werror=unused-but-set-variable]
>>   u32 reg, dummy;
>>            ^~~~~
>> cc1: all warnings being treated as errors
>>
>> Mark variables 'dummy' as "maybe unused" to satisfy when rdmsr() is
>> stubbed, which is the same as what we already do in pata_cs5536.c .
>>
>> Signed-off-by: John Garry <john.garry@xxxxxxxxxx>


Reviewed-by: Sergey Shtylyov <s.shtylyov@xxxxxx>

> Looks good, but I wonder why I am not getting this warning. I always do
> W=1 and C=1 builds. I tried allmodconfig now and I am not getting the
> warning...

   I can confirm the (fatal) warnings with RedHat gcc 10.3.1... but somehow they only
occur on x86_64 with allmodconfig indeed (which is strange)...

[...]

MBR, Sergey