linux-kernel - Re: [PATCH 5/5] cpufreq: use correct values of cpus in __cpufreq_remove_dev

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Message-ID: <52387343.7040007@wwwdotorg.org>
Date:	Tue, 17 Sep 2013 09:20:35 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	rjw@...k.pl, srivatsa.bhat@...ux.vnet.ibm.com,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] cpufreq: use correct values of cpus in __cpufreq_remove_dev_finish()

On 09/11/2013 11:25 PM, Viresh Kumar wrote:
> This broke after a recent change "cedb70a cpufreq: Split __cpufreq_remove_dev()
> into two parts" from Srivatsa..
> 
> Consider a scenario where we have two CPUs in a policy (0 & 1) and we are
> removing cpu 1. On the call to __cpufreq_remove_dev_prepare() we have cleared 1
> from policy->cpus and now on a call to __cpufreq_remove_dev_finish() we read
> cpumask_weight of policy->cpus, which will come as 1 and this code will behave
> as if we are removing the last cpu from policy :)
> 
> Fix it by clearing cpu mask in __cpufreq_remove_dev_finish() instead of
> __cpufreq_remove_dev_prepare().

I see this patch isn't in linux-next yet, nor did it make 3.12-rc1. I
assume it'll make 3.12-rc2? It solves various CPU hotplug and
suspend/resume issues for me.
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