linux-kernel - Re: [Xen-devel] [PATCH] xen/arm: disable cpuidle when linux is running as dom0

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Date:	Mon, 15 Jul 2013 17:22:00 +0100
From:	Julien Grall <julien.grall@...aro.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	stefano.stabellini@...citrix.com, ian.campbell@...rix.com,
	patches@...aro.org, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xen.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [Xen-devel] [PATCH] xen/arm: disable cpuidle when linux is running
 as dom0

On 07/15/2013 04:25 PM, Konrad Rzeszutek Wilk wrote:
> On Mon, Jul 15, 2013 at 03:21:41PM +0100, Julien Grall wrote:
>> When linux is running as dom0, Xen doesn't show the physical cpu but a
>> virtual CPU.
>> On some ARM SOC (for instance the exynos 5250), linux registers callbacks
>> for cpuidle. When these callbacks are called, they will modify
>> directly the physical cpu not the virtual one. It can impact the whole board
>> instead of dom0.
> 
> Should you also call disable_cpufreq() ?

I had some issue on the versatile express when cpufreq was disabled.
I will give another try and see the exact error.

-- 
Julien

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