From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date: Fri, 10 Sep 2010 04:23:04 +0000 (+0900)
Subject: hugetlb, rmap: fix confusing page locking in hugetlb_cow()
X-Git-Tag: v2.6.36-rc6~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56c9cfb13c9b6516017eea4e8cbe22ea02e07ee6;p=pandora-kernel.git

hugetlb, rmap: fix confusing page locking in hugetlb_cow()

The "if (!trylock_page)" block in the avoidcopy path of hugetlb_cow()
looks confusing and is buggy.  Originally this trylock_page() was
intended to make sure that old_page is locked even when old_page !=
pagecache_page, because then only pagecache_page is locked.

This patch fixes it by moving page locking into hugetlb_fault().

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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