linux-kernel - Re: [PATCH 2/2] x86_64 irq: Handle irqs pending in IRR during irq migration.

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Message-Id: <1170487929.3073.988.camel@laptopd505.fenrus.org>
Date:	Sat, 03 Feb 2007 08:32:09 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, "Lu, Yinghai" <yinghai.lu@....com>,
	Luigi Genoni <luigi.genoni@...elli.com>,
	Ingo Molnar <mingo@...e.hu>,
	Natalie Protasevich <protasnb@...il.com>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 2/2] x86_64 irq:  Handle irqs pending in IRR during irq
	migration.


> > 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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