From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrea Arcangeli <aarcange@redhat.com>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>,
Wanpeng Li <liwp.linux@gmail.com>
Subject: Re: [PATCH v2 1/2][BUGFIX] mm: do not use page_count without a page pin
Date: Thu, 14 Jun 2012 11:20:30 +0900 [thread overview]
Message-ID: <4FD94A6E.3050906@jp.fujitsu.com> (raw)
In-Reply-To: <1339636334-9238-1-git-send-email-minchan@kernel.org>
(2012/06/14 10:12), Minchan Kim wrote:
> d179e84ba fixed the problem[1] in vmscan.c but same problem is here.
> Let's fix it.
>
> [1] http://comments.gmane.org/gmane.linux.kernel.mm/65844
>
> I copy and paste d179e84ba's contents for description.
>
> "It is unsafe to run page_count during the physical pfn scan because
> compound_head could trip on a dangling pointer when reading
> page->first_page if the compound page is being freed by another CPU."
>
> * changelog from v1
> - Add comment about skip tail page of THP - Andrea
> - fix typo - Wanpeng Li
> - based on next-20120613
>
> Cc: Andrea Arcangeli<aarcange@redhat.com>
> Cc: Mel Gorman<mgorman@suse.de>
> Cc: Michal Hocko<mhocko@suse.cz>
> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>
> Cc: Wanpeng Li<liwp.linux@gmail.com>
> Signed-off-by: Minchan Kim<minchan@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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prev parent reply other threads:[~2012-06-14 2:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-14 1:12 Minchan Kim
2012-06-14 1:12 ` [PATCH v2 2/2] mm: clean up __count_immobile_pages Minchan Kim
2012-06-14 1:15 ` Minchan Kim
2012-06-14 1:14 ` [PATCH v2 1/2][BUGFIX] mm: do not use page_count without a page pin Minchan Kim
2012-06-14 2:20 ` Kamezawa Hiroyuki [this message]
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