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Subject[PATCH 1/4] hugetlb, rmap: always use anon_vma root pointer
Date
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>
---
mm/rmap.c | 13 +++++++------
1 files changed, 7 insertions(+), 6 deletions(-)
diff --git v2.6.36-rc3/mm/rmap.c v2.6.36-rc3/mm/rmap.c
index f6f0d2d..2854857 100644
--- v2.6.36-rc3/mm/rmap.c
+++ v2.6.36-rc3/mm/rmap.c
@@ -1564,13 +1564,14 @@ static void __hugepage_set_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, int exclusive)
{
struct anon_vma *anon_vma = vma->anon_vma;
+
BUG_ON(!anon_vma);
- if (!exclusive) {
- struct anon_vma_chain *avc;
- avc = list_entry(vma->anon_vma_chain.prev,
- struct anon_vma_chain, same_vma);
- anon_vma = avc->anon_vma;
- }
+
+ if (PageAnon(page))
+ return;
+ if (!exclusive)
+ anon_vma = anon_vma->root;
+
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
page->mapping = (struct address_space *) anon_vma;
page->index = linear_page_index(vma, address);
--
1.7.2.2


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