linux-kernel - Re: [RFC PATCH 1/2] genirq: Add chip hooks for taking CPUs on/off line.

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Message-ID: <alpine.LFD.2.00.1103232304240.31464@localhost6.localdomain6>
Date:	Wed, 23 Mar 2011 23:09:32 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	David Daney <ddaney.cavm@...il.com>
cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] genirq: Add chip hooks for taking CPUs on/off
 line.

On Wed, 23 Mar 2011, David Daney wrote:
> On 03/21/2011 02:13 PM, Thomas Gleixner wrote:
> > I can't imagine any other purpose for that.
> 
> Modifying the affinity of non-per-cpu IRQs to use the new CPU?

Hmm. Good point. Ok, go ahead with that name.

> > Hmm. The offline fixup_irq() code is arch specific and usually calls
> > desc->irq_data.chip->irq_set_affinity under desc->lock. I have not yet
> > found an arch independent way to do that. Any ideas welcome.
> > 
> 
> There are all the new affinity callbacks, and the things shown in procfs?  Are
> those handled properly if I call chip->irq_set_affinity?  I think not.

If the arch code updates irq_data.affinity then yes. I still need to
go through all that maze and figure out what all the archs really want
to do in that case.

Thanks,

	tglx
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