linux-kernel - Re: [PATCH] cpufreq: prevent 'policy->cpus' become offline in __gov_queue

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Date:	Wed, 05 Jun 2013 16:58:44 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, rjw@...k.pl,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] cpufreq: prevent 'policy->cpus' become offline in __gov_queue_work()

Hi, Viresh

On 06/05/2013 04:53 PM, Viresh Kumar wrote:
[snip]
>> It was caused by the policy->cpus changed during the process of
>> __gov_queue_work(), in other word, cpu offline happened.
>>
>> This patch will use get/put_online_cpus() to prevent the offline
>> happen inside __gov_queue_work(), after applied the patch, the
>> warning is gone as Jiri tested:
>>
>>         Link: https://lkml.org/lkml/2013/6/5/88
>>
>> CC: "Rafael J. Wysocki" <rjw@...k.pl>
>> CC: Viresh Kumar <viresh.kumar@...aro.org>
>> Reported-by: Borislav Petkov <bp@...en8.de>
>> Reported-by: Jiri Kosina <jkosina@...e.cz>
>> Tested-by: Jiri Kosina <jkosina@...e.cz>
>> Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
>> ---
>>  drivers/cpufreq/cpufreq_governor.c |    3 +++
>>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

Thanks for your ack :)

Regards,
Michael Wang

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