tree 9350d9fc11a5a6ca81d4ee063278999e4dfe869d
parent 6af6aab34a88050c8270ef75ddbdefef5c1dca00
author Christoph Lameter <clameter@engr.sgi.com> 1141174756 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1141188824 -0800

[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>