linux-kernel - Re: [PATCH] ARM: kexec: validate CPU hotplug support

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Date:	Fri, 19 Jul 2013 09:18:36 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Russell King <linux@....linux.org.uk>
CC:	ebiederm@...ssion.com, Simon Horman <horms@...ge.net.au>,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will.deacon@....com>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH] ARM: kexec: validate CPU hotplug support

On 07/11/2013 04:48 PM, Stephen Warren wrote:
> From: Stephen Warren <swarren@...dia.com>
> 
> Architectures should fully validate whether kexec is possible as part of
> machine_kexec_prepare(), so that user-space's kexec_load() operation can
> report any problems. Performing validation in machine_kexec() itself is
> too late, since it is not allowed to return.
> 
> Prior to this patch, ARM's machine_kexec() was testing after-the-fact
> whether machine_kexec_prepare() was able to disable all but one CPU.
> Instead, modify machine_kexec_prepare() to validate all conditions
> necessary for machine_kexec_prepare()'s to succeed. BUG if the validation
> succeeded, yet disabling the CPUs didn't actually work.

Russell, does this look good to put into the ARM patch tracker?
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