hugetlb, rmap: always use anon_vma root pointer
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Fri, 10 Sep 2010 04:23:03 +0000 (13:23 +0900)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 24 Sep 2010 00:29:18 +0000 (17:29 -0700)
commit433abed6c6f76ca079a9564f2a1a51fd28ebe0ca
treed654c3331c1910fdae732c6576d1f023b0cfae7d
parentbcf835e52e0974b2e2e056b190dd66372b28cfce
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>
mm/rmap.c