linux-kernel - Re: usr/include/linux/soundcard.h warnings for 'make headers

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Message-ID: <20090121054138.GA26551@uranus.ravnborg.org>
Date:	Wed, 21 Jan 2009 06:41:38 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	alsa-devel@...a-project.org, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: usr/include/linux/soundcard.h warnings for 'make headers_check'

On Wed, Jan 21, 2009 at 01:08:37AM +0100, Takashi Iwai wrote:
> At Tue, 20 Jan 2009 21:08:22 +0530,
> Jaswinder Singh Rajput wrote:
> > 
> > usr/include/linux/soundcard.h is giving following warnings for 'make headers_check':
> >  usr/include/linux/soundcard.h:1047: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1048: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1049: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1050: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1051: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1053: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1055: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1056: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1061: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1062: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1078: extern's make no sense in userspace
> >  usr/include/linux/soundcard.h:1079: extern's make no sense in userspace
> > 
> > Do we need to fix these warnings.
> 
> No, these are declarations for OSS-lib.
> It doesn't belong to kernel, but it's better to keep it for
> compatibility in some way.

But not in the kernel for sure.
I just checked and for example: OSS_init is not used anywhere in the kernel.
The kernel headers are not a "dump all your stuff" ground anymore.

So I encourage you to find a better home for the user space library definitons.
We can let the definiton stay for a while - but eventually they have to
be dropped from the kernel.

	Sam
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