linux-kernel - Re: [PATCH] x86 - Make CONFIG_OLPC dependent on CONFIG_MGEODE

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Date:	Wed, 12 Nov 2008 22:44:58 -0500
From:	Jeremy Katz <katzj@...hat.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Andres Salomon <dilinger@...ued.net>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jordan Crouse <jordan.crouse@....com>,
	linux-kernel@...r.kernel.org, dsaxena@...top.org
Subject: Re: [PATCH] x86 - Make CONFIG_OLPC dependent on CONFIG_MGEODE_LX

On Wed, 2008-11-12 at 15:29 +0100, Takashi Iwai wrote:
> At Wed, 12 Nov 2008 08:54:10 -0500, Jeremy Katz wrote:
> > It's not about angering, it's about causing regressions in
> > functionality.  Doing this will completely break the ability to run
> > generic distros on the OLPC hardware without a special kernel.  Which
> > has been something that a lot of work has gone on upstream to avoid for
> > all sorts of cases (VMI, Xen, SMP, ...).  
> 
> But, it is broken.  The asm/olpc includes asm/geode.h and it refers
> geode_gpio*() there.

The geode_gpio() users in asm/olpc.h are for some defines that really
probably don't belong there and which aren't used elsewhere in the main
tree afaict from a quick grep.  I'd be glad to send the patch to remove
it :-)

> > > but what we really need to
> > > do is to make geode_gpio* defined even when we're not specifically
> > > building with MGEODE_LX.  I'm not sure how best to do that, but the
> > > answer probably includes using the generic x86 gpio api.
> > 
> > This probably needs to be done as a precondition for getting the alsa
> > changes merged or the alsa changes need to have the bits which depend on
> > geode_gpio ripped out until it can be done.
> 
> Then let's stop inclusion of asm/geode.h from asm/olpc.h at first.
> Any driver codes including asm/geode.h can be broken potentially
> without a proper dependency.

Yes, but having a driver dependent on building for a specific x86
variant is quite wrong.  What would people think about a driver which
was dependent on CONFIG_M586?  Keep in mind that CONFIG_M686 wouldn't
then apply...

Jeremy

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