From: Andrea Arcangeli <aarcange@redhat.com>
Date: Wed, 15 Jun 2011 22:08:51 +0000 (-0700)
Subject: mm: vmscan: do not use page_count without a page pin
X-Git-Tag: v3.0-rc4~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d179e84ba;p=pandora-kernel.git

mm: vmscan: do not use page_count without a page pin

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.

[mgorman@suse.de: split out patch]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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