Subject: Re: [PATCH 2/2] x86_64 irq:  Handle irqs pending in IRR during irq
	migration.
From: Arjan van de Ven <arjan@infradead.org>
To: Andrew Morton <akpm@osdl.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>, linux-kernel@vger.kernel.org,
       "Lu, Yinghai" <yinghai.lu@amd.com>,
       Luigi Genoni <luigi.genoni@pirelli.com>, Ingo Molnar <mingo@elte.hu>,
       Natalie Protasevich <protasnb@gmail.com>, Andi Kleen <ak@suse.de>
In-Reply-To: <20070202170500.57b6c3a3.akpm@linux-foundation.org>
References: <200701221116.13154.luigi.genoni@pirelli.com>
	 <200702021848.55921.luigi.genoni@pirelli.com>
	 <m1ejp85tgm.fsf@ebiederm.dsl.xmission.com>
	 <200702021905.39922.luigi.genoni@pirelli.com>
	 <m1zm7w3wvr.fsf_-_@ebiederm.dsl.xmission.com>
	 <m1veik3woc.fsf_-_@ebiederm.dsl.xmission.com>
	 <20070202170500.57b6c3a3.akpm@linux-foundation.org>
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Organization: Intel International BV
Date: Sat, 03 Feb 2007 08:32:09 +0100
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> > Once the migration operation is complete we know we will receive
> > no more interrupts on this vector so the irq pending state for
> > this irq will no longer be updated.  If the irq is not pending and
> > we are in the intermediate state we immediately free the vector,
> > otherwise in we free the vector in do_IRQ when the pending irq
> > arrives.
> 
> So is this a for-2.6.20 thing?  The bug was present in 2.6.19, so
> I assume it doesn't affect many people?

I got a few reports of this; irqbalance may trigger this kernel bug it
seems... I would suggest to consider this for 2.6.20 since it's a
hard-hang case

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