linux-kernel - Re: [PATCH 0/4] powerpc: Fix minor build issues on 2.6.32-rc7 without CONFIG

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Date:	Tue, 17 Nov 2009 13:25:37 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	Michael Neuling <mikey@...ling.org>
Subject: Re: [PATCH 0/4] powerpc: Fix minor build issues on 2.6.32-rc7
	without CONFIG_XICS set

On Tue, Nov 17, 2009 at 11:39:04PM +1100, Michael Ellerman wrote:
> On Tue, 2009-11-17 at 12:07 +0000, Mel Gorman wrote:
> > KConfig doesn't require CONFIG_XICS to be set with CONFIG_PSERIES but if
> > it's not set, there are numerous small build errors. This is a small series
> > of patches to allow CONFIG_XICS to be unset in the config.
> > 
> > XICS appears to be some sort of interrupt controller but I'm not sure how
> > common it is on systems that require CONFIG_PSERIES. If CONFIG_PSERIES
> > universally requires CONFIG_XICS, the better path might be to force it to
> > be set.
> 
> It is indeed 'some sort of interrupt controller' :)
> 
> All the virtualised PSERIES systems have, or appear to have, a XICS. So
> it's pretty common.
> 
> I think the only time you see an MPIC is on older machines, and even
> then maybe only if you're running bare metal.
> 
> So it is pretty much required for a PSERIES kernel, but perhaps there
> are cases where the BML guys want to be able to turn it off.
> 

Do you want to take ownership of the series as I'm a bit unclear on how
and when XICS should be used? If not, I don't mind fixing the series up
as you suggested but I wouldn't be in the best position to determine if
the final result is sensible or not.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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