linux-kernel - Re: [PATCH -next] sound/oss/dmasound: fix 'dmasound

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Date:   Thu, 14 Apr 2022 10:22:46 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Miles Chen <miles.chen@...iatek.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH -next] sound/oss/dmasound: fix 'dmasound_setup' defined but not used

On Thu, 14 Apr 2022 10:11:18 +0200,
Miles Chen wrote:
> 
> We observed: 'dmasound_setup' defined but not used error with
> COMPILER=gcc ARCH=m68k DEFCONFIG=allmodconfig build.
> 
> __setup() does not work if MODULE is defined.
> Fix it by warpping dmasound_setup with #ifndef MODULES.
> 
> Error(s):
> sound/oss/dmasound/dmasound_core.c:1431:12: error: 'dmasound_setup' defined but not used [-Werror=unused-function]
> 
> Signed-off-by: Miles Chen <miles.chen@...iatek.com>

This must be a side-effect of the recent fix 9dd7c46346ca
("sound/oss/dmasound: fix build when drivers are mixed =y/=m").
Adding Randy to Cc.

IMO, a less uglier way would be to add __maybe_unused to that
function.  But it's a matter of taste.


thanks,

Takashi

> ---
>  sound/oss/dmasound/dmasound_core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/oss/dmasound/dmasound_core.c b/sound/oss/dmasound/dmasound_core.c
> index 9c48f3a9e3d1..a1b3e71beadf 100644
> --- a/sound/oss/dmasound/dmasound_core.c
> +++ b/sound/oss/dmasound/dmasound_core.c
> @@ -1428,6 +1428,7 @@ void dmasound_deinit(void)
>  		unregister_sound_dsp(sq_unit);
>  }
>  
> +#ifndef MODULE
>  static int dmasound_setup(char *str)
>  {
>  	int ints[6], size;
> @@ -1470,6 +1471,7 @@ static int dmasound_setup(char *str)
>  }
>  
>  __setup("dmasound=", dmasound_setup);
> +#endif
>  
>      /*
>       *  Conversion tables
> -- 
> 2.18.0
>