linux-kernel - RE: [PATCH 04/11] ASoC: codecs: da7219: fix 'defined but not used' warning

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Message-ID: <DB6PR1001MB1096535996028B7DE0D136DC806A0@DB6PR1001MB1096.EURPRD10.PROD.OUTLOOK.COM>
Date:   Fri, 3 Jul 2020 09:33:06 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.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>,
        Support Opensource <Support.Opensource@...semi.com>,
        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 04/11] ASoC: codecs: da7219: fix 'defined but not used'
 warning

On 01 July 2020 19:24, Pierre-Louis Bossart wrote:

> fix W=1 warning
> 
> sound/soc/codecs/da7219.c:1711:36: warning: 'da7219_acpi_match'
> defined but not used [-Wunused-const-variable=]
>  1711 | static const struct acpi_device_id da7219_acpi_match[] = {
>       |                                    ^~~~~~~~~~~~~~~~~
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>  sound/soc/codecs/da7219.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
> index f2520a6c7875..153ea30b5a8f 100644
> --- a/sound/soc/codecs/da7219.c
> +++ b/sound/soc/codecs/da7219.c
> @@ -1708,11 +1708,13 @@ static const struct of_device_id da7219_of_match[] =
> {
>  };
>  MODULE_DEVICE_TABLE(of, da7219_of_match);
> 
> +#ifdef CONFIG_ACPI
>  static const struct acpi_device_id da7219_acpi_match[] = {
>  	{ .id = "DLGS7219", },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(acpi, da7219_acpi_match);
> +#endif

I think this will break non-ACPI builds as this symbol is used in the
declaration of 'da7219_i2c_driver', without conditional compilation surrounding
it. Unless of course I'm missing something. Could we instead use
'__maybe_unused' to avoid this warning?

> 
>  static enum da7219_micbias_voltage
>  	da7219_fw_micbias_lvl(struct device *dev, u32 val)
> --
> 2.25.1