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

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Date:   Fri, 3 Jul 2020 09:57:46 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        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 03 July 2020 10:33, Adam Thomson wrote

> 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?

Obviously a slow start to the day for my brain. You've obviously built test this
given the intention behind this is for non-ACPI builds. Will get more coffee
shortly.

Still wonder if '__maybe_unused' might be nicer as per suspend/resume functions
on platforms which don't include PM_OPS. Either way though:

Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>

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