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

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Message-ID: <a376393a-6a17-2836-204b-0d4ff60729c0@st.com>
Date:   Wed, 8 Jul 2020 11:11:57 +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>,
        "broonie@...nel.org" <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 06/10] ASoC: sti: uniperif: fix 'defined by not used'
 warning

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

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,
>