linux-kernel - Re: [PATCH v2] ASoC: sun50i-dmic: avoid unused variable warning for sun50i_dmic_of

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Date:   Wed, 26 Oct 2022 22:31:05 +0800
From:   Chao Song <chao.song@...ux.intel.com>
To:     Ban Tao <fengzheng923@...il.com>, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org
Cc:     alsa-devel@...a-project.org, linux-sunxi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ASoC: sun50i-dmic: avoid unused variable warning for
 sun50i_dmic_of_match


On 10/23/2022 3:44 PM, Ban Tao wrote:
> In configurations with CONFIG_OF=n, we get a harmless build warning:
>
> sound/soc/sunxi/sun50i-dmic.c:268:34: warning: unused variable
> 'sun50i_dmic_of_match' [-Wunused-const-variable]
>
> Signed-off-by: Ban Tao <fengzheng923@...il.com>
> Reported-by: kernel test robot <lkp@...el.com>
> Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
> v1->v2:Add "Acked-by" tag.
> ---
>   sound/soc/sunxi/sun50i-dmic.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/soc/sunxi/sun50i-dmic.c b/sound/soc/sunxi/sun50i-dmic.c
> index 86cff5a..62509cb 100644
> --- a/sound/soc/sunxi/sun50i-dmic.c
> +++ b/sound/soc/sunxi/sun50i-dmic.c
> @@ -391,7 +391,7 @@ static const struct dev_pm_ops sun50i_dmic_pm = {
>   static struct platform_driver sun50i_dmic_driver = {
>   	.driver         = {
>   		.name   = "sun50i-dmic",
> -		.of_match_table = of_match_ptr(sun50i_dmic_of_match),
> +		.of_match_table = sun50i_dmic_of_match,
I don't think this is the right direction (remove the of_match_ptr) to 
fix the issue.

of_match_ptr(of_table) returns of_table if CONFIG_OF=y, and returns NULL 
if CONFIG_OF=n.

So guard  the definition of sun50i_dmic_of_match with `#ifdef CONFIG_OF` 
should be better.

Many other drivers do it this way.

>   		.pm     = &sun50i_dmic_pm,
>   	},
>   	.probe          = sun50i_dmic_probe,