linux-kernel - Re: [PATCH 3/4] memory-hotplug: clear hwpoisoned flag when onlining pages

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Date:	Thu, 27 Sep 2012 16:17:15 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	wency@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, minchan.kim@...il.com,
	akpm@...ux-foundation.org, isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH 3/4] memory-hotplug: clear hwpoisoned flag when onlining pages

On Thu, Sep 27, 2012 at 1:45 AM,  <wency@...fujitsu.com> wrote:
> From: Wen Congyang <wency@...fujitsu.com>
>
> hwpoisoned may set when we offline a page by the sysfs interface
> /sys/devices/system/memory/soft_offline_page or
> /sys/devices/system/memory/hard_offline_page. If we don't clear
> this flag when onlining pages, this page can't be freed, and will
> not in free list. So we can't offline these pages again. So we
> should clear this flag when onlining pages.

This seems wrong fix to me.  After offline, memory may or may not
change with new one. Thus we can't assume any memory status. Thus,
we should just forget hwpoison status at _offline_ event.
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