X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=mm%2Frmap.c;h=ebee816887364285dcdee19ae6e0f2bae714814d;hb=4f0ddfdffc8bef3a5eb9154734d68a6053194948;hp=c3d6dc4223a439a1e639f6a39a34353cd578803c;hpb=53f79acb6ecb648afd63e0f13deba167f1a934df;p=safe%2Fjmp%2Flinux-2.6

diff --git a/mm/rmap.c b/mm/rmap.c
index c3d6dc4..ebee816 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -336,21 +336,15 @@ int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
  * Subfunctions of page_referenced: page_referenced_one called
  * 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,
+static int page_referenced_one(struct page *page, struct vm_area_struct *vma,
+			       unsigned long address, unsigned int *mapcount,
 			       unsigned long *vm_flags)
 {
 	struct mm_struct *mm = vma->vm_mm;
-	unsigned long address;
 	pte_t *pte;
 	spinlock_t *ptl;
 	int referenced = 0;
 
-	address = vma_address(page, vma);
-	if (address == -EFAULT)
-		goto out;
-
 	pte = page_check_address(page, mm, address, &ptl, 0);
 	if (!pte)
 		goto out;
@@ -409,6 +403,9 @@ static int page_referenced_anon(struct page *page,
 
 	mapcount = page_mapcount(page);
 	list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
+		unsigned long address = vma_address(page, vma);
+		if (address == -EFAULT)
+			continue;
 		/*
 		 * If we are reclaiming on behalf of a cgroup, skip
 		 * counting on behalf of references from different
@@ -416,7 +413,7 @@ static int page_referenced_anon(struct page *page,
 		 */
 		if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont))
 			continue;
-		referenced += page_referenced_one(page, vma,
+		referenced += page_referenced_one(page, vma, address,
 						  &mapcount, vm_flags);
 		if (!mapcount)
 			break;
@@ -474,6 +471,9 @@ static int page_referenced_file(struct page *page,
 	mapcount = page_mapcount(page);
 
 	vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
+		unsigned long address = vma_address(page, vma);
+		if (address == -EFAULT)
+			continue;
 		/*
 		 * If we are reclaiming on behalf of a cgroup, skip
 		 * counting on behalf of references from different
@@ -481,7 +481,7 @@ static int page_referenced_file(struct page *page,
 		 */
 		if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont))
 			continue;
-		referenced += page_referenced_one(page, vma,
+		referenced += page_referenced_one(page, vma, address,
 						  &mapcount, vm_flags);
 		if (!mapcount)
 			break;
@@ -535,18 +535,14 @@ int page_referenced(struct page *page,
 	return referenced;
 }
 
-static int page_mkclean_one(struct page *page, struct vm_area_struct *vma)
+static int page_mkclean_one(struct page *page, struct vm_area_struct *vma,
+			    unsigned long address)
 {
 	struct mm_struct *mm = vma->vm_mm;
-	unsigned long address;
 	pte_t *pte;
 	spinlock_t *ptl;
 	int ret = 0;
 
-	address = vma_address(page, vma);
-	if (address == -EFAULT)
-		goto out;
-
 	pte = page_check_address(page, mm, address, &ptl, 1);
 	if (!pte)
 		goto out;
@@ -578,8 +574,12 @@ static int page_mkclean_file(struct address_space *mapping, struct page *page)
 
 	spin_lock(&mapping->i_mmap_lock);
 	vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
-		if (vma->vm_flags & VM_SHARED)
-			ret += page_mkclean_one(page, vma);
+		if (vma->vm_flags & VM_SHARED) {
+			unsigned long address = vma_address(page, vma);
+			if (address == -EFAULT)
+				continue;
+			ret += page_mkclean_one(page, vma, address);
+		}
 	}
 	spin_unlock(&mapping->i_mmap_lock);
 	return ret;
@@ -761,19 +761,14 @@ void page_remove_rmap(struct page *page)
  * repeatedly from either try_to_unmap_anon or try_to_unmap_file.
  */
 static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
-				enum ttu_flags flags)
+			    unsigned long address, enum ttu_flags flags)
 {
 	struct mm_struct *mm = vma->vm_mm;
-	unsigned long address;
 	pte_t *pte;
 	pte_t pteval;
 	spinlock_t *ptl;
 	int ret = SWAP_AGAIN;
 
-	address = vma_address(page, vma);
-	if (address == -EFAULT)
-		goto out;
-
 	pte = page_check_address(page, mm, address, &ptl, 0);
 	if (!pte)
 		goto out;
@@ -788,7 +783,7 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 			ret = SWAP_MLOCK;
 			goto out_unmap;
 		}
-		if (MLOCK_PAGES && TTU_ACTION(flags) == TTU_MUNLOCK)
+		if (TTU_ACTION(flags) == TTU_MUNLOCK)
 			goto out_unmap;
 	}
 	if (!(flags & TTU_IGNORE_ACCESS)) {
@@ -861,7 +856,7 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 out_unmap:
 	pte_unmap_unlock(pte, ptl);
 
-	if (MLOCK_PAGES && ret == SWAP_MLOCK) {
+	if (ret == SWAP_MLOCK) {
 		ret = SWAP_AGAIN;
 		if (down_read_trylock(&vma->vm_mm->mmap_sem)) {
 			if (vma->vm_flags & VM_LOCKED) {
@@ -938,11 +933,10 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
 		return ret;
 
 	/*
-	 * MLOCK_PAGES => feature is configured.
-	 * if we can acquire the mmap_sem for read, and vma is VM_LOCKED,
+	 * If we can acquire the mmap_sem for read, and vma is VM_LOCKED,
 	 * keep the sem while scanning the cluster for mlocking pages.
 	 */
-	if (MLOCK_PAGES && down_read_trylock(&vma->vm_mm->mmap_sem)) {
+	if (down_read_trylock(&vma->vm_mm->mmap_sem)) {
 		locked_vma = (vma->vm_flags & VM_LOCKED);
 		if (!locked_vma)
 			up_read(&vma->vm_mm->mmap_sem); /* don't need it */
@@ -1019,7 +1013,10 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
 		return ret;
 
 	list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
-		ret = try_to_unmap_one(page, vma, flags);
+		unsigned long address = vma_address(page, vma);
+		if (address == -EFAULT)
+			continue;
+		ret = try_to_unmap_one(page, vma, address, flags);
 		if (ret != SWAP_AGAIN || !page_mapped(page))
 			break;
 	}
@@ -1057,7 +1054,10 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
 
 	spin_lock(&mapping->i_mmap_lock);
 	vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
-		ret = try_to_unmap_one(page, vma, flags);
+		unsigned long address = vma_address(page, vma);
+		if (address == -EFAULT)
+			continue;
+		ret = try_to_unmap_one(page, vma, address, flags);
 		if (ret != SWAP_AGAIN || !page_mapped(page))
 			goto out;
 	}
@@ -1075,9 +1075,6 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
 
 	list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
 						shared.vm_set.list) {
-		if (!MLOCK_PAGES && !(flags & TTU_IGNORE_MLOCK) &&
-			(vma->vm_flags & VM_LOCKED))
-			continue;
 		cursor = (unsigned long) vma->vm_private_data;
 		if (cursor > max_nl_cursor)
 			max_nl_cursor = cursor;
@@ -1110,9 +1107,6 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
 	do {
 		list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
 						shared.vm_set.list) {
-			if (!MLOCK_PAGES && !(flags & TTU_IGNORE_MLOCK) &&
-			    (vma->vm_flags & VM_LOCKED))
-				continue;
 			cursor = (unsigned long) vma->vm_private_data;
 			while ( cursor < max_nl_cursor &&
 				cursor < vma->vm_end - vma->vm_start) {