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

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Message-ID: <20141113025337.GA9068@medulla.variantweb.net>
Date:	Wed, 12 Nov 2014 20:53:37 -0600
From:	Seth Jennings <sjennings@...iantweb.net>
To:	Mahendran Ganesh <opensource.ganesh@...il.com>
Cc:	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

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.

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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