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>
diff --git a/mm/rmap.c b/mm/rmap.c
index f5d6799..2f855ba 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -364,9 +364,10 @@
*/
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;