linux-kernel - Re: [PATCH v3 06/10] ASoC: sti: uniperif: fix 'defined by not used' warning

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Date:   Wed, 8 Jul 2020 15:33:45 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
CC:     "tiwai@...e.de" <tiwai@...e.de>,
        open list <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v3 06/10] ASoC: sti: uniperif: fix 'defined by not used'
 warning

hi

On 7/8/20 2:55 PM, Pierre-Louis Bossart wrote:
> 
> 
> On 7/8/20 4:11 AM, Arnaud POULIQUEN wrote:
>> Hi Pierre-Louis,
>>
>> On 7/7/20 9:16 PM, Pierre-Louis Bossart wrote:
>>> Fix W=1 warning. The table uni_tdm_hw is declared in a header included
>>> by multiple C file. This isn't really a good practice but for now
>>> using __maybe_unused makes the following warning go away.
>>>
>>> sound/soc/sti/sti_uniperif.c:12:
>>> sound/soc/sti/uniperif.h:1351:38: warning: ‘uni_tdm_hw’ defined but
>>> not used [-Wunused-const-variable=]
>>>   1351 | static const struct snd_pcm_hardware uni_tdm_hw = {
>>>        |                                      ^~~~~~~~~~
>>>
>>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>>
>> Thanks for the patch,
>> Seems that the same patch has already been proposed by Lee:
>> https://www.spinics.net/lists/arm-kernel/msg820327.html
> 
> that's right, we both fixed the same things, and this is the merged series.
> Do you mind providing a tag if you're ok with the change?

Sure, just need to known which one i should tag... I saw that you are discussing with Lee 
by default i ack both, i let you decide which one will be merged :)

Acked-by: Arnaud Pouliquen <arnaud.pouliquen@...com>

> 
>> Regards,
>> Arnaud
>>
>>> ---
>>>   sound/soc/sti/uniperif.h | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/sound/soc/sti/uniperif.h b/sound/soc/sti/uniperif.h
>>> index 2dc2da5d458b..a16adeb7c1e9 100644
>>> --- a/sound/soc/sti/uniperif.h
>>> +++ b/sound/soc/sti/uniperif.h
>>> @@ -1348,7 +1348,7 @@ struct sti_uniperiph_data {
>>>   	struct sti_uniperiph_dai dai_data;
>>>   };
>>>   
>>> -static const struct snd_pcm_hardware uni_tdm_hw = {
>>> +static __maybe_unused const struct snd_pcm_hardware uni_tdm_hw = {
>>>   	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
>>>   		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
>>>   		SNDRV_PCM_INFO_MMAP_VALID,
>>>