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authorAndrea Arcangeli <aarcange@redhat.com>2010-08-09 17:19:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:44:59 -0700
commit21d0d443cdc1658a8c1484fdcece4803f0f96d0e (patch)
tree1ee41c66f24972ed427ce43780cb53efca82dcaf
parent288468c334e98aacbb7e2fb8bde6bc1adcd55e05 (diff)
rmap: resurrect page_address_in_vma anon_vma check
With root anon-vma it's trivial to keep doing the usual check as in old-anon-vma code. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/rmap.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index f5d6799b8a74..2f855babfd06 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -364,9 +364,10 @@ vma_address(struct page *page, struct vm_area_struct *vma)
*/
unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
{
- if (PageAnon(page))
- ;
- else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
+ if (PageAnon(page)) {
+ if (vma->anon_vma->root != page_anon_vma(page)->root)
+ return -EFAULT;
+ } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
if (!vma->vm_file ||
vma->vm_file->f_mapping != page->mapping)
return -EFAULT;

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