---

yaml
---
r: 19376
b: refs/heads/master
c: b16664e
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2a16e3f4b0c408b9e50297d2ec27e295d490267a
+refs/heads/master: b16664e44c54525be89dc07ad15a13b4eeec5634

trunk/mm/memory.c

@@ -1871,6 +1871,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		goto out;
 
 	entry = pte_to_swp_entry(orig_pte);
+again:
 	page = lookup_swap_cache(entry);
 	if (!page) {
  		swapin_readahead(entry, address, vma);
@@ -1894,6 +1895,12 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
 
 	mark_page_accessed(page);
 	lock_page(page);
+	if (!PageSwapCache(page)) {
+		/* Page migration has occured */
+		unlock_page(page);
+		page_cache_release(page);
+		goto again;
+	}
 
 	/*
 	 * Back out if somebody else already faulted in this pte.

trunk/mm/shmem.c

@@ -1028,6 +1028,14 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
 			page_cache_release(swappage);
 			goto repeat;
 		}
+		if (!PageSwapCache(swappage)) {
+			/* Page migration has occured */
+			shmem_swp_unmap(entry);
+			spin_unlock(&info->lock);
+			unlock_page(swappage);
+			page_cache_release(swappage);
+			goto repeat;
+		}
 		if (PageWriteback(swappage)) {
 			shmem_swp_unmap(entry);
 			spin_unlock(&info->lock);

trunk/mm/swapfile.c

@@ -646,6 +646,7 @@ static int try_to_unuse(unsigned int type)
 		 */
 		swap_map = &si->swap_map[i];
 		entry = swp_entry(type, i);
+again:
 		page = read_swap_cache_async(entry, NULL, 0);
 		if (!page) {
 			/*
@@ -680,6 +681,12 @@ static int try_to_unuse(unsigned int type)
 		wait_on_page_locked(page);
 		wait_on_page_writeback(page);
 		lock_page(page);
+		if (!PageSwapCache(page)) {
+			/* Page migration has occured */
+			unlock_page(page);
+			page_cache_release(page);
+			goto again;
+		}
 		wait_on_page_writeback(page);
 
 		/*