linux-kernel - Re: [RFC PATCH 1/4] genirq: Provide basic NMI management for interrupt lines

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Message-ID: <b03c672a-1329-9867-2a5c-dce97ec4b72a@arm.com>
Date:   Tue, 17 Jul 2018 17:35:10 +0100
From:   Julien Thierry <julien.thierry@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        ricardo.neri-calderon@...ux.intel.com, marc.zyngier@....com,
        mingo@...nel.org
Subject: Re: [RFC PATCH 1/4] genirq: Provide basic NMI management for
 interrupt lines

On 17/07/18 16:51, Peter Zijlstra wrote:
> On Tue, Jul 17, 2018 at 04:48:17PM +0100, Julien Thierry wrote:
>> Supporting desc->affinity_hint for NMIs shouldn't be an issue, right?
> 
> Shouldn't NMIs be strictly per cpu interrupt sources?

That's a good question, and I don't have a proper answer right now...

However, per cpu or not, the affinity still needs to be set for that 
interrupt. It seemed to me that the desc->affinity_hint was just a way 
to keep track of the interrupt affinity when it gets set through 
irq_set_affinity_hint.

Is that not the case?

Thanks,

-- 
Julien Thierry