From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Date: Wed, 11 Sep 2013 21:22:52 +0000 (-0700)
Subject: mm/hwpoison: don't need to hold compound lock for hugetlbfs page
X-Git-Tag: v3.12-rc1~52^2~174
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9121153fdfbfaa930bf65077a5597e20d3ac608;p=pandora-kernel.git

mm/hwpoison: don't need to hold compound lock for hugetlbfs page

compound lock is introduced by commit e9da73d67("thp: compound_lock."), it
is used to serialize put_page against __split_huge_page_refcount().  In
addition, transparent hugepages will be splitted in hwpoison handler and
just one subpage will be poisoned.  There is unnecessary to hold compound
lock for hugetlbfs page.  This patch replace compound_trans_order by
compond_order in the place where the page is hugetlbfs page.

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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