linux-kernel - Re: Fix memory leak in cpufreq stats.

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Message-ID: <CAMbhsRTi8-41em4+-7NpLwXFpbGcy3Vsib5ees_OWm5JGmOVDw@mail.gmail.com>
Date:	Mon, 11 Mar 2013 18:23:27 -0700
From:	Colin Cross <ccross@...gle.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Tu, Xiaobing" <xiaobing.tu@...el.com>,
	"davej@...hat.com" <davej@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"Tang, Guifang" <guifang.tang@...el.com>, stable@...r.kernel.org
Subject: Re: Fix memory leak in cpufreq stats.

On Mon, Oct 15, 2012 at 1:30 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Monday 15 of October 2012 02:48:28 Tu, Xiaobing wrote:
>>
>> Fix memory leak in cpufreq stats.
>>
>> When system enter sleep, non-boot CPUs will be disable.
>> Cpufreq stats sysfs is created when the CPU is up, but it is not freed when
>> the CPU going down. This will cause memory leak.
>> signed-off-by: xiaobing tu <xiaobing.tu@...el.com>
>> signed-off-by: guifang tang <guifang.tang@...el.com>
>
> I will push this patch for v3.7 in the -rc3 time frame if no one objects.
>
> Thanks,
> Rafael
>
>
>> diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
>> index b40ee14..3998316 100644
>> --- a/drivers/cpufreq/cpufreq_stats.c
>> +++ b/drivers/cpufreq/cpufreq_stats.c
>> @@ -328,6 +328,7 @@ static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
>>                 cpufreq_update_policy(cpu);
>>                 break;
>>         case CPU_DOWN_PREPARE:
>> +       case CPU_DOWN_PREPARE_FROZEN:
>>                 cpufreq_stats_free_sysfs(cpu);
>>                 break;
>>         case CPU_DEAD:
>>
>> Br
>> XiaoBing Tu
>> PSI@...tem Integration Shanghai

This patch, commited as e37736777254ce1abc85493a5cacbefe5983b896 since
v3.7, should also have gone to stable.  It should apply all the way
back to 3.0.
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