linux-kernel - Re: [PATCH v3] sound/oss/dmasound: fix build when drivers are mixed =y/=m

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Date:   Fri, 15 Apr 2022 06:48:52 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        kernel test robot <lkp@...el.com>,
        Arnd Bergmann <arnd@...db.de>, Takashi Iwai <tiwai@...e.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v3] sound/oss/dmasound: fix build when drivers are mixed
 =y/=m

On Tue, Apr 05, 2022 at 04:41:18PM -0700, Randy Dunlap wrote:
> When CONFIG_DMASOUND_ATARI=m and CONFIG_DMASOUND_Q40=y (or vice versa),
> dmasound_core.o can be built without dmasound_deinit() being defined,
> causing a build error:
> 
> ERROR: modpost: "dmasound_deinit" [sound/oss/dmasound/dmasound_atari.ko] undefined!
> 
> Modify dmasound_core.c and dmasound.h so that dmasound_deinit() is
> always available.
> 
> The mixed modes (=y/=m) also mean that several variables and structs
> have to be declared in all cases.
> 
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: lore.kernel.org/r/202204032138.EFT9qGEd-lkp@...el.com
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.com>
> Cc: alsa-devel@...a-project.org
> ---

m68k:allmodconfig fails to build with this patch in the tree.

Error log:
sound/oss/dmasound/dmasound_core.c:1431:12: error: 'dmasound_setup' defined but not used

... because __setup() is empty if MODULE is defined.

Guenter