From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date: Wed, 8 Sep 2010 01:19:37 +0000 (+0900)
Subject: hugetlb: move refcounting in hugepage allocation inside hugetlb_lock
X-Git-Tag: v2.6.37-rc1~109^2^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9869b837c098732bad84939015c0eb391b23e41;p=pandora-kernel.git

hugetlb: move refcounting in hugepage allocation inside hugetlb_lock

Currently alloc_huge_page() raises page refcount outside hugetlb_lock.
but it causes race when dequeue_hwpoison_huge_page() runs concurrently
with alloc_huge_page().
To avoid it, this patch moves set_page_refcounted() in hugetlb_lock.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---

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