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

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Date:	Fri, 25 Dec 2009 12:09:28 +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 Thu, 24 Dec 2009 16:59:12 -0200,
Henrique de Moraes Holschuh wrote:
> 
> On Wed, 23 Dec 2009, Takashi Iwai wrote:
> > At Tue, 22 Dec 2009 17:38:58 -0200,
> > Henrique de Moraes Holschuh wrote:
> > > 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.
> 
> "depends on SND || SND = n" takes care of the technical restrictions.

Yep, that's what I mentioned as Kconfig dependency :)

> I am testing the patch now.  No ALSA, no volume subdriver, module still
> works (and prints some crap to syslog so that the user knows the driver
> could do more with ALSA support).
> 
> > It'd be also not nice if suddenly a certain functionality disappears
> > without warning (even if the subsystem is enabled but as a module).
>
> The warning will be there.  Although I don't warn of missing rfkill
> functionality if the kernel is missing the rfkill subsystem...

The messages could be KERN_INFO instead of KERN_WARNING, I think.


thanks,

Takashi
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