linux-kernel - Re: [Patch] thinkpad_acpi: fix a build error

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Message-ID: <s5hhbrimbtw.wl%tiwai@suse.de>
Date:	Wed, 23 Dec 2009 07:41:31 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Marcel Holtmann <marcel@...tmann.org>,
	Xiaotian Feng <xtfeng@...il.com>,
	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	Corentin Chary <corentincj@...aif.net>,
	ibm-acpi-devel@...ts.sourceforge.net,
	Len Brown <len.brown@...el.com>,
	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	akpm@...ux-foundation.org, helight.xu@...il.com
Subject: Re: [Patch] thinkpad_acpi: fix a build error

At Tue, 22 Dec 2009 17:38:58 -0200,
Henrique de Moraes Holschuh wrote:
> 
> On Mon, 21 Dec 2009, Randy Dunlap wrote:
> > On Mon, 21 Dec 2009 14:38:56 -0800 Marcel Holtmann wrote:
> > > > > The patch isn't correct (I guess the upstream fix is same?).
> > > > > 
> > > > > CONFIG_SOUND is a global config for sound subsystem.  The relevant
> > > > > functions are ALSA core part, which is CONFIG_SND.
> > > > > So, the fix should be:
> > > > > 
> > > > > 	depends on SND
> > > > > 
> > > > > instead.
> > > > 
> > > > Indeed.  Ingo already fixed that too.
> > > > 
> > > > Although I personally would prefer:
> > > > select SOUND
> > > > select SND
> > > > 
> > > > But anything that stops the build errors will do for now.
> > > 
> > > I still haven't seen this patch in Linus' tree. And you do need select
> > > SOUND and SND. Otherwise you still get build errors. I have tested this
> > > on my machine. So can someone please submit a proper patch to get this
> > > fixed.
> > 
> > Ugh.  Please don't 'select' to build an entire subsystem.
> 
> I won't in this case. I think I will cook up a patch to disable the entire
> mixer subsystem in thinkpad-acpi if CONFIG_SND is not available.  I don't
> like the depends on SND though.

That's also not so trivial unless you give any dependency in Kconfig.
Without a restriction, THINKPAD_ACPI=y and SND=m can be chosen.

It'd be also not nice if suddenly a certain functionality disappears
without warning (even if the subsystem is enabled but as a module).


thanks,

Takashi
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