linux-kernel - Re: default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)

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Message-Id: <20081024.161818.256978293.davem@davemloft.net>
Date:	Fri, 24 Oct 2008 16:18:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	galak@...nel.crashing.org
Cc:	csnook@...hat.com, maxk@...lcomm.com, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: default IRQ affinity change in v2.6.27 (breaking several SMP
 PPC based systems)

From: Kumar Gala <galak@...nel.crashing.org>
Date: Fri, 24 Oct 2008 10:39:05 -0500

> As for making it ARCH specific, that doesn't really help since not
> all PPC hw has the limitation I spoke of.  Not even all MPIC (in our
> cases) have the limitation.

Since the PPC code knows exactly which MPICs have the problem the
PPC code is where the constraining can occur.

I agree completely with the suggestion that the arch code has to
interpret the cpumask as appropriate for the hardware, since the
user can stick "illegal" values there anyways.
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