From: Christoph Lameter <clameter@engr.sgi.com>
Date: Wed, 1 Mar 2006 00:59:16 +0000 (-0800)
Subject: [PATCH] remove_from_swap: fix locking
X-Git-Tag: v2.6.16-rc6~146
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8788c0cce63e0cc8689a123d1ce0af1e28cd583;p=pandora-kernel.git

[PATCH] remove_from_swap: fix locking

remove_from_swap() currently attempts to use page_lock_anon_vma to obtain
an anon_vma lock.  That is not working since the page may have been
remapped via swap ptes in order to move the page.

However, do_migrate_pages() obtain the mmap_sem lock and therefore there is
a guarantee that the anonymous vma will not vanish from under us.  There is
therefore no need to use page_lock_anon_vma.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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