linux-kernel - Re: [PATCH 04/17] irqchip: irq-armada-370-xp: suspend/resume support

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Message-ID: <5457BD82.3090309@free-electrons.com>
Date:	Mon, 03 Nov 2014 18:38:10 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	devicetree@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/17] irqchip: irq-armada-370-xp: suspend/resume support

Hi Thomas,

On 24/10/2014 13:59, Thomas Petazzoni wrote:
> This commit adds suspend/resume support to the irqchip driver used on
> Armada XP platforms (amongst others). It does so by adding a set of
> suspend/resume syscore_ops, that will respectively save and restore
> the necessary registers to ensure interrupts continue to work after
> resume.
> 
> It is worth mentioning that the affinity is lost during a
> suspend/resume cycle, because when a secondary CPU is brought
> off-line, all interrupts that are assigned to this CPU in terms of
> affinity gets re-assigned to a still running CPU. Therefore, right
> before entering suspend, all interrupts are assigned to the boot CPU.

So what about /proc/irq/*/smp_affinity ?

Do this files still represent accurate information?

Thanks,

Gregory


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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