X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Frmap.c;h=450f5241b5a525282ae7eb150fe322423b01e570;hb=d44ed4f86892e350f4b16a3489b7e7c1a9bb7ead;hp=28c6cf96d3c4f9ae60fd45a7f4ecfe23d8968816;hpb=839b9685e80592809d6dfdd865986cd1b5ddc2fb;p=linux-2.6

diff --git a/mm/rmap.c b/mm/rmap.c
index 28c6cf96d3..450f5241b5 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -439,22 +439,19 @@ int page_referenced(struct page *page, int is_locked, int ignore_token)
 void page_add_anon_rmap(struct page *page,
 	struct vm_area_struct *vma, unsigned long address)
 {
-	struct anon_vma *anon_vma = vma->anon_vma;
-	pgoff_t index;
-
 	BUG_ON(PageReserved(page));
-	BUG_ON(!anon_vma);
 
 	inc_mm_counter(vma->vm_mm, anon_rss);
 
-	anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
-	index = (address - vma->vm_start) >> PAGE_SHIFT;
-	index += vma->vm_pgoff;
-	index >>= PAGE_CACHE_SHIFT - PAGE_SHIFT;
-
 	if (atomic_inc_and_test(&page->_mapcount)) {
-		page->index = index;
+		struct anon_vma *anon_vma = vma->anon_vma;
+
+		BUG_ON(!anon_vma);
+		anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
 		page->mapping = (struct address_space *) anon_vma;
+
+		page->index = linear_page_index(vma, address);
+
 		inc_page_state(nr_mapped);
 	}
 	/* else checking page index and mapping is racy */
@@ -527,6 +524,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma)
 	 * If the page is mlock()d, we cannot swap it out.
 	 * If it's recently referenced (perhaps page_referenced
 	 * skipped over this mm) then we should reactivate it.
+	 *
+	 * Pages belonging to VM_RESERVED regions should not happen here.
 	 */
 	if ((vma->vm_flags & (VM_LOCKED|VM_RESERVED)) ||
 			ptep_clear_flush_young(vma, address, pte)) {