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Date: Fri, 24 Oct 2008 12:39:58 -0500
From: Scott Wood <scottwood@freescale.com>
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To: Kumar Gala <galak@kernel.crashing.org>
Subject: Re: default IRQ affinity change in v2.6.27 (breaking several SMP
	PPC	based systems)
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Cc: LinuxPPC-dev list <linuxppc-dev@ozlabs.org>, tglx@linutronix.de,
	Chris Snook <csnook@redhat.com>,
	linux-kernel Kernel <linux-kernel@vger.kernel.org>, maxk@qualcomm.com
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Kumar Gala wrote:
> So why not just have x86 startup code set irq_default_affinity = 
> CPU_MASK_ALL than?

That doesn't really solve the problem, as a user could still manually 
set an invalid affinity.  The MPIC driver should reduce the affinity 
itself to what the hardware can handle.

-Scott

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Date: Fri, 24 Oct 2008 12:39:58 -0500
From: Scott Wood <scottwood@freescale.com>
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To: Kumar Gala <galak@kernel.crashing.org>
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       LinuxPPC-dev list <linuxppc-dev@ozlabs.org>, tglx@linutronix.de,
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Subject: Re: default IRQ affinity change in v2.6.27 (breaking several SMP
 PPC	based systems)
References: <4E3CD4D5-FC1B-40BF-A776-C612B95806B8@kernel.crashing.org>	<4901E6FB.4070200@redhat.com>	<36A821E7-7F37-42AF-9A05-7205FCBF89EE@kernel.crashing.org>	<4901F31E.9040007@redhat.com> <5967704E-0117-46B8-8505-6A002502C38C@kernel.crashing.org>
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Kumar Gala wrote:
> So why not just have x86 startup code set irq_default_affinity = 
> CPU_MASK_ALL than?

That doesn't really solve the problem, as a user could still manually 
set an invalid affinity.  The MPIC driver should reduce the affinity 
itself to what the hardware can handle.

-Scott