linux-kernel - Re: [PATCH] mm/zswap: unregister zswap_cpu_notifier

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Date:	Thu, 13 Nov 2014 21:55:56 +0800
From:	Ganesh Mahendran <opensource.ganesh@...il.com>
To:	Seth Jennings <sjennings@...iantweb.net>
Cc:	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/zswap: unregister zswap_cpu_notifier_block in cleanup procedure

2014-11-13 10:53 GMT+08:00 Seth Jennings <sjennings@...iantweb.net>:
> On Sun, Nov 09, 2014 at 07:22:23PM +0800, Mahendran Ganesh wrote:
>> In zswap_cpu_init(), the code does not unregister *zswap_cpu_notifier_block*
>> during the cleanup procedure.
>
> This is not needed.  If we are in the cleanup code, we never got to the
> __register_cpu_notifier() call.

Yes, you are right. Thanks for you review.

>
> Thanks,
> Seth
>
>>
>> This patch fix this issue.
>>
>> Signed-off-by: Mahendran Ganesh <opensource.ganesh@...il.com>
>> ---
>>  mm/zswap.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/mm/zswap.c b/mm/zswap.c
>> index ea064c1..51a2c45 100644
>> --- a/mm/zswap.c
>> +++ b/mm/zswap.c
>> @@ -404,6 +404,7 @@ static int zswap_cpu_init(void)
>>  cleanup:
>>       for_each_online_cpu(cpu)
>>               __zswap_cpu_notifier(CPU_UP_CANCELED, cpu);
>> +     __unregister_cpu_notifier(&zswap_cpu_notifier_block);
>>       cpu_notifier_register_done();
>>       return -ENOMEM;
>>  }
>> --
>> 1.7.9.5
>>
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