---

yaml --- r: 21079 b: refs/heads/master c: 90036ee h: refs/heads/master i: 21077: 88568d8 21075: 7eea5e2 21071: 3b88f36 v: v3
git-mirror · Mar 17, 2006 · 995b3fb · 995b3fb
1 parent a901fdd
commit 995b3fb
Show file tree

Hide file tree

Showing 2 changed files with 13 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e0e8eb54d8ae0c4cfd1d297f6351b08a7f635c5f
+refs/heads/master: 90036ee5938d89638e80f4d0d0700d0f2dbd4a6a
diff --git a/trunk/mm/mempolicy.c b/trunk/mm/mempolicy.c
@@ -330,9 +330,19 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
 	int err;
 	struct vm_area_struct *first, *vma, *prev;
 
-	/* Clear the LRU lists so pages can be isolated */
-	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
+		/* Must have swap device for migration */
+		if (nr_swap_pages <= 0)
+			return ERR_PTR(-ENODEV);
+
+		/*
+		 * Clear the LRU lists so pages can be isolated.
+		 * Note that pages may be moved off the LRU after we have
+		 * drained them. Those pages will fail to migrate like other
+		 * pages that may be busy.
+		 */
 		lru_add_drain_all();
+	}
 
 	first = find_vma(mm, start);
 	if (!first)