Date: Thu, 15 Nov 2012 15:39:08 -0800 (PST)
From: David Rientjes <rientjes@google.com>
To: Wen Congyang <wency@cn.fujitsu.com>
cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-acpi@vger.kernel.org, Len Brown <len.brown@intel.com>,
        "Rafael J. Wysocki" <rjw@sisk.pl>,
        Andrew Morton <akpm@linux-foundation.org>,
        Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>, Jiang Liu <jiang.liu@huawei.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Minchan Kim <minchan.kim@gmail.com>, Mel Gorman <mgorman@suse.de>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Toshi Kani <toshi.kani@hp.com>, Jiang Liu <liuj97@gmail.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>, Christoph Lameter <cl@linux.com>
Subject: Re: [Patch v5 5/7] acpi_memhotplug.c: don't allow to eject the memory
 device if it is being used
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References: <1352962777-24407-1-git-send-email-wency@cn.fujitsu.com> <1352962777-24407-6-git-send-email-wency@cn.fujitsu.com>
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On Thu, 15 Nov 2012, Wen Congyang wrote:

> We eject the memory device even if it is in use.  It is very dangerous,
> and it will cause the kernel to be panicked.
> 
> CC: David Rientjes <rientjes@google.com>
> CC: Jiang Liu <liuj97@gmail.com>
> CC: Len Brown <len.brown@intel.com>
> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> CC: Paul Mackerras <paulus@samba.org>
> CC: Christoph Lameter <cl@linux.com>
> Cc: Minchan Kim <minchan.kim@gmail.com>
> CC: Andrew Morton <akpm@linux-foundation.org>
> CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> CC: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
> CC: Rafael J. Wysocki <rjw@sisk.pl>
> CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>

Acked-by: David Rientjes <rientjes@google.com>

Thanks for adding the comment about why num_enabled is incremented for 
-EEXIST.
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