Message-ID: <4FD9624D.3020600@jp.fujitsu.com>
Date: Thu, 14 Jun 2012 13:02:21 +0900
From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
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To: Jiang Liu <jiang.liu@huawei.com>
CC: Mel Gorman <mgorman@suse.de>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>,
        Keping Chen <chenkeping@huawei.com>, Tony Luck <tony.luck@intel.com>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Xishi Qiu <qiuxishi@huawei.com>, Jiang Liu <liuj97@gmail.com>,
        Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Subject: Re: [PATCH] memory hotplug: fix invalid memory access caused by stale
 kswapd pointer
References: <1339645491-5656-1-git-send-email-jiang.liu@huawei.com>
In-Reply-To: <1339645491-5656-1-git-send-email-jiang.liu@huawei.com>
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(2012/06/14 12:44), Jiang Liu wrote:
> Function kswapd_stop() will be called to destroy the kswapd work thread
> when all memory of a NUMA node has been offlined. But kswapd_stop() only
> terminates the work thread without resetting NODE_DATA(nid)->kswapd to NULL.
> The stale pointer will prevent kswapd_run() from creating a new work thread
> when adding memory to the memory-less NUMA node again. Eventually the stale
> pointer may cause invalid memory access.
> 
> Signed-off-by: Xishi Qiu<qiuxishi@huawei.com>
> Signed-off-by: Jiang Liu<liuj97@gmail.com>
> 

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


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