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

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Message-ID: <9044b81f-76db-75de-db74-f45d6e5ea71e@omp.ru>
Date:   Tue, 28 Jun 2022 13:05:26 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        John Garry <john.garry@...wei.com>
CC:     <linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ata: pata_cs5535: Fix W=1 warnings

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@...wei.com>


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

> 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