linux-kernel - Re: [PATCH] mm/hwpoison: fix race between soft_offline_page and unpoison

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Message-ID: <BLU436-SMTP188CEA4C54A9E8CDC3C29A880790@phx.gbl>
Date:	Mon, 17 Aug 2015 13:29:35 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH] mm/hwpoison: fix race between soft_offline_page and
 unpoison_memory

On 8/17/15 12:32 PM, Naoya Horiguchi wrote:
> [...]
> OK, so I wrote the next version against mmotm-2015-08-13-15-29 (replied to
> this email.) It moves PageSetHWPoison part into migration code, which should
> close up the reported race window and minimize the another revived race window
> of reusing offlined pages, so I feel that it's a good compromise between two
> races.
>
> My testing shows no kernel panic with these patches (same testing easily caused
> panics for bare mmotm-2015-08-13-15-29,) so they should work. But I'm appreciated
> if you help double checking.

This patchset looks good to me after some stress testing.

Andrew,

Could we pick it in order to catch up upcoming merge window? :-)

Regards,
Wanpeng Li

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