1 files changed, 21 insertions, 39 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index 914d04b..f853c6d 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -225,7 +225,7 @@ vma_address(struct page *page, struct vm_area_struct *vma)
 
 /*
  * At what user virtual address is page expected in vma? checking that the
- * page matches the vma: currently only used by unuse_process, on anon pages.
+ * page matches the vma: currently only used on anon pages, by unuse_vma;
  */
 unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
 {
@@ -234,7 +234,8 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
 		    (void *)page->mapping - PAGE_MAPPING_ANON)
 			return -EFAULT;
 	} else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
-		if (vma->vm_file->f_mapping != page->mapping)
+		if (!vma->vm_file ||
+		    vma->vm_file->f_mapping != page->mapping)
 			return -EFAULT;
 	} else
 		return -EFAULT;
@@ -289,7 +290,7 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm,
  * repeatedly from either page_referenced_anon or page_referenced_file.
  */
 static int page_referenced_one(struct page *page,
-	struct vm_area_struct *vma, unsigned int *mapcount, int ignore_token)
+	struct vm_area_struct *vma, unsigned int *mapcount)
 {
 	struct mm_struct *mm = vma->vm_mm;
 	unsigned long address;
@@ -310,7 +311,7 @@ static int page_referenced_one(struct page *page,
 
 	/* Pretend the page is referenced if the task has the
 	   swap token and is in the middle of a page fault. */
-	if (mm != current->mm && !ignore_token && has_swap_token(mm) &&
+	if (mm != current->mm && has_swap_token(mm) &&
 			rwsem_is_locked(&mm->mmap_sem))
 		referenced++;
 
@@ -320,7 +321,7 @@ out:
 	return referenced;
 }
 
-static int page_referenced_anon(struct page *page, int ignore_token)
+static int page_referenced_anon(struct page *page)
 {
 	unsigned int mapcount;
 	struct anon_vma *anon_vma;
@@ -333,8 +334,7 @@ static int page_referenced_anon(struct page *page, int ignore_token)
 
 	mapcount = page_mapcount(page);
 	list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
-		referenced += page_referenced_one(page, vma, &mapcount,
-							ignore_token);
+		referenced += page_referenced_one(page, vma, &mapcount);
 		if (!mapcount)
 			break;
 	}
@@ -353,7 +353,7 @@ static int page_referenced_anon(struct page *page, int ignore_token)
  *
  * This function is only called from page_referenced for object-based pages.
  */
-static int page_referenced_file(struct page *page, int ignore_token)
+static int page_referenced_file(struct page *page)
 {
 	unsigned int mapcount;
 	struct address_space *mapping = page->mapping;
@@ -391,8 +391,7 @@ static int page_referenced_file(struct page *page, int ignore_token)
 			referenced++;
 			break;
 		}
-		referenced += page_referenced_one(page, vma, &mapcount,
-							ignore_token);
+		referenced += page_referenced_one(page, vma, &mapcount);
 		if (!mapcount)
 			break;
 	}
@@ -409,13 +408,10 @@ static int page_referenced_file(struct page *page, int ignore_token)
  * Quick test_and_clear_referenced for all mappings to a page,
  * returns the number of ptes which referenced the page.
  */
-int page_referenced(struct page *page, int is_locked, int ignore_token)
+int page_referenced(struct page *page, int is_locked)
 {
 	int referenced = 0;
 
-	if (!swap_token_default_timeout)
-		ignore_token = 1;
-
 	if (page_test_and_clear_young(page))
 		referenced++;
 
@@ -424,15 +420,14 @@ int page_referenced(struct page *page, int is_locked, int ignore_token)
 
 	if (page_mapped(page) && page->mapping) {
 		if (PageAnon(page))
-			referenced += page_referenced_anon(page, ignore_token);
+			referenced += page_referenced_anon(page);
 		else if (is_locked)
-			referenced += page_referenced_file(page, ignore_token);
+			referenced += page_referenced_file(page);
 		else if (TestSetPageLocked(page))
 			referenced++;
 		else {
 			if (page->mapping)
-				referenced += page_referenced_file(page,
-								ignore_token);
+				referenced += page_referenced_file(page);
 			unlock_page(page);
 		}
 	}
@@ -529,10 +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)) ||
+	if ((vma->vm_flags & VM_LOCKED) ||
 			ptep_clear_flush_young(vma, address, pte)) {
 		ret = SWAP_FAIL;
 		goto out_unmap;
@@ -613,7 +606,6 @@ static void try_to_unmap_cluster(unsigned long cursor,
 	struct page *page;
 	unsigned long address;
 	unsigned long end;
-	unsigned long pfn;
 
 	address = (vma->vm_start + cursor) & CLUSTER_MASK;
 	end = address + CLUSTER_SIZE;
@@ -642,21 +634,14 @@ static void try_to_unmap_cluster(unsigned long cursor,
 	for (; address < end; pte++, address += PAGE_SIZE) {
 		if (!pte_present(*pte))
 			continue;
-
-		pfn = pte_pfn(*pte);
-		if (unlikely(!pfn_valid(pfn))) {
-			print_bad_pte(vma, *pte, address);
-			continue;
-		}
-
-		page = pfn_to_page(pfn);
-		BUG_ON(PageAnon(page));
+		page = vm_normal_page(vma, address, *pte);
+		BUG_ON(!page || PageAnon(page));
 
 		if (ptep_clear_flush_young(vma, address, pte))
 			continue;
 
 		/* Nuke the page table entry. */
-		flush_cache_page(vma, address, pfn);
+		flush_cache_page(vma, address, pte_pfn(*pte));
 		pteval = ptep_clear_flush(vma, address, pte);
 
 		/* If nonlinear, store the file page offset in the pte. */
@@ -727,7 +712,7 @@ static int try_to_unmap_file(struct page *page)
 
 	list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
 						shared.vm_set.list) {
-		if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
+		if (vma->vm_flags & VM_LOCKED)
 			continue;
 		cursor = (unsigned long) vma->vm_private_data;
 		if (cursor > max_nl_cursor)
@@ -761,7 +746,7 @@ static int try_to_unmap_file(struct page *page)
 	do {
 		list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
 						shared.vm_set.list) {
-			if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
+			if (vma->vm_flags & VM_LOCKED)
 				continue;
 			cursor = (unsigned long) vma->vm_private_data;
 			while ( cursor < max_nl_cursor &&
@@ -783,11 +768,8 @@ static int try_to_unmap_file(struct page *page)
 	 * in locked vmas).  Reset cursor on all unreserved nonlinear
 	 * vmas, now forgetting on which ones it had fallen behind.
 	 */
-	list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
-						shared.vm_set.list) {
-		if (!(vma->vm_flags & VM_RESERVED))
-			vma->vm_private_data = NULL;
-	}
+	list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list)
+		vma->vm_private_data = NULL;
 out:
 	spin_unlock(&mapping->i_mmap_lock);
 	return ret;