linux-kernel - Re: [PATCH RESEND] sound: make OSS sound core optional

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Date:	Wed, 27 Aug 2008 11:09:58 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org, perex@...ex.cz
Subject: Re: [PATCH RESEND] sound: make OSS sound core optional

At Wed, 27 Aug 2008 10:19:35 +0200,
Tejun Heo wrote:
> 
> sound/sound_core.c implements soundcore.ko contains two parts -
> sound_class which is shared by both ALSA and OSS and device
> redirection support for OSS.  It's always compiled when any sound
> support is enabled although it's necessary only when OSS (the actual
> one or emulation) is enabled.  This is slightly wasteful and as device
> redirection always registers character device region for major 14, it
> prevents alternative implementation.
> 
> This patch introduces a new config SOUND_OSS_CORE which is selected
> iff OSS support is actually necessary and build the OSS core part
> conditionally.
> 
> If OSS is disabled, soundcore merely contains sound_class but leaving
> it that way seems to be the simplest approach as otherwise sound_class
> should be in ALSA core file if OSS is disabled but should be in
> soundcore if OSS is enabled and there's also the user confusion
> factor.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

Thanks for the patch.  I like the idea.


> +config SOUND_OSS_CORE
> +	bool
> +	default n
> +
>  source "sound/oss/dmasound/Kconfig"

This seems missing from the scope.
But, I think this should be rather in the block "if SOUND_PRIME" below.


> --- work.orig/sound/sound_core.c
> +++ work/sound/sound_core.c
(snip)
> +MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR);

This alias should be in #ifdef CONFIG_SOUND_OSS_CORE.
The module doesn't provide that major without CONFIG_SOUND_OSS_CORE.


Takashi
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