linux-kernel - Re: [kbuild-all] Re: sound/soc/soc-compress.c:75:28: warning: 'component' is used uninitialized in this function

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Date:   Wed, 22 Apr 2020 09:17:52 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: [kbuild-all] Re: sound/soc/soc-compress.c:75:28: warning:
 'component' is used uninitialized in this function



On 4/21/20 2:23 PM, Kuninori Morimoto wrote:
> Hi
>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   7a56db0299f9d43b4fe076838150c5cc293df131
>> commit: 613fb50059cf19aa6acbc503a00265d9151c0b09 ASoC: soc-core: remove snd_soc_rtdcom_list
>> date:   3 months ago
>> config: i386-randconfig-a002-20200420 (attached as .config)
>> compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
>> reproduce:
>>          git checkout 613fb50059cf19aa6acbc503a00265d9151c0b09
>>          # save the attached .config to linux build tree
>>          make ARCH=i386
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kbuild test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>     sound/soc/soc-compress.c: In function 'soc_compr_open':
>>>> sound/soc/soc-compress.c:75:28: warning: 'component' is used uninitialized in this function [-Wuninitialized]
>>       struct snd_soc_component *component, *save = NULL;
>>                                 ^~~~~~~~~
> Hmm... I still can't reproduce this issue.
> I don't have gcc-6, thus can't try it.
> Is this the issue ??

Hi Kuninori,

We can reproduce the warning with gcc-6 (gcc version 6.5.0 20181026 
(Debian 6.5.0-2)),
and the warning can be closed if changed to "struct snd_soc_component 
*component = NULL, *save = NULL;"

Best Regards,
Rong Chen