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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>
This commit is contained in:
Andrea Arcangeli 2010-08-09 17:19:10 -07:00 committed by Linus Torvalds
parent 288468c334
commit 21d0d443cd
1 changed files with 4 additions and 3 deletions
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7
mm/rmap.c
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@ -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;