Naoya Horiguchi 433abed6c6 hugetlb, rmap: always use anon_vma root pointer
This patch applies Andrea's fix given by the following patch into hugepage
rmapping code:

  commit 288468c334e98aacbb7e2fb8bde6bc1adcd55e05
  Author: Andrea Arcangeli <aarcange@redhat.com>
  Date:   Mon Aug 9 17:19:09 2010 -0700

This patch uses anon_vma->root and avoids unnecessary overwriting when
anon_vma is already set up.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-23 17:29:18 -07:00
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