Date: Fri, 25 Dec 2009 12:09:28 +0100
Message-ID: <s5h8wcrmhsn.wl%tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Randy Dunlap <rdunlap@xenotime.net>, Marcel Holtmann <marcel@holtmann.org>,
       Xiaotian Feng <xtfeng@gmail.com>, Amerigo Wang <amwang@redhat.com>,
       linux-kernel@vger.kernel.org, Corentin Chary <corentincj@iksaif.net>,
       ibm-acpi-devel@lists.sourceforge.net, Len Brown <len.brown@intel.com>,
       Alan Jenkins <alan-jenkins@tuffmail.co.uk>, akpm@linux-foundation.org,
       helight.xu@gmail.com
Subject: Re: [Patch] thinkpad_acpi: fix a build error
In-Reply-To: <20091224185912.GA25861@khazad-dum.debian.net>
References: <20091218093132.4415.23424.sendpatchset@localhost.localdomain>
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	<s5hhbrowpty.wl%tiwai@suse.de>
	<20091218142815.GB15898@khazad-dum.debian.net>
	<1261435136.4041.152.camel@localhost.localdomain>
	<20091221144432.81702725.rdunlap@xenotime.net>
	<20091222193858.GB1796@khazad-dum.debian.net>
	<s5hhbrimbtw.wl%tiwai@suse.de>
	<20091224185912.GA25861@khazad-dum.debian.net>
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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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