X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Fmigrate.c;h=7a66ca25dc8aa99b77f2a4f041fed0cd8194b6aa;hb=7f375f325feacd8a628e00e0d53390a4f6d8abc2;hp=3f1e0c2c942c90d59c565e92ee119479861f7c47;hpb=55b4d6a52195a8f277ffddf755ddaff359878f41;p=powerpc.git

diff --git a/mm/migrate.c b/mm/migrate.c
index 3f1e0c2c94..7a66ca25dc 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -294,7 +294,7 @@ out:
 static int migrate_page_move_mapping(struct address_space *mapping,
 		struct page *newpage, struct page *page)
 {
-	struct page **radix_pointer;
+	void **pslot;
 
 	if (!mapping) {
 		/* Anonymous page */
@@ -305,12 +305,11 @@ static int migrate_page_move_mapping(struct address_space *mapping,
 
 	write_lock_irq(&mapping->tree_lock);
 
-	radix_pointer = (struct page **)radix_tree_lookup_slot(
-						&mapping->page_tree,
-						page_index(page));
+	pslot = radix_tree_lookup_slot(&mapping->page_tree,
+ 					page_index(page));
 
 	if (page_count(page) != 2 + !!PagePrivate(page) ||
-			*radix_pointer != page) {
+			(struct page *)radix_tree_deref_slot(pslot) != page) {
 		write_unlock_irq(&mapping->tree_lock);
 		return -EAGAIN;
 	}
@@ -318,7 +317,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
 	/*
 	 * Now we know that no one else is looking at the page.
 	 */
-	get_page(newpage);
+	get_page(newpage);	/* add cache reference */
 #ifdef CONFIG_SWAP
 	if (PageSwapCache(page)) {
 		SetPageSwapCache(newpage);
@@ -326,8 +325,14 @@ static int migrate_page_move_mapping(struct address_space *mapping,
 	}
 #endif
 
-	*radix_pointer = newpage;
+	radix_tree_replace_slot(pslot, newpage);
+
+	/*
+	 * Drop cache reference from old page.
+	 * We know this isn't the last reference.
+	 */
 	__put_page(page);
+
 	write_unlock_irq(&mapping->tree_lock);
 
 	return 0;
@@ -409,6 +414,7 @@ int migrate_page(struct address_space *mapping,
 }
 EXPORT_SYMBOL(migrate_page);
 
+#ifdef CONFIG_BLOCK
 /*
  * Migration function for pages with buffers. This function can only be used
  * if the underlying filesystem guarantees that no other references to "page"
@@ -466,6 +472,7 @@ int buffer_migrate_page(struct address_space *mapping,
 	return 0;
 }
 EXPORT_SYMBOL(buffer_migrate_page);
+#endif
 
 /*
  * Writeback a page to clean the dirty state
@@ -525,7 +532,7 @@ static int fallback_migrate_page(struct address_space *mapping,
 	 * Buffers may be managed in a filesystem specific way.
 	 * We must have no buffers or drop them.
 	 */
-	if (page_has_buffers(page) &&
+	if (PagePrivate(page) &&
 	    !try_to_release_page(page, GFP_KERNEL))
 		return -EAGAIN;
 
@@ -741,7 +748,7 @@ static struct page *new_page_node(struct page *p, unsigned long private,
 
 	*result = &pm->status;
 
-	return alloc_pages_node(pm->node, GFP_HIGHUSER, 0);
+	return alloc_pages_node(pm->node, GFP_HIGHUSER | GFP_THISNODE, 0);
 }
 
 /*
@@ -774,7 +781,7 @@ static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm,
 
 		err = -EFAULT;
 		vma = find_vma(mm, pp->addr);
-		if (!vma)
+		if (!vma || !vma_migratable(vma))
 			goto set_status;
 
 		page = follow_page(vma, pp->addr, FOLL_GET);
@@ -950,7 +957,8 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
 				goto out;
 
 			pm[i].node = node;
-		}
+		} else
+			pm[i].node = 0;	/* anything to not match MAX_NUMNODES */
 	}
 	/* End marker */
 	pm[nr_pages].node = MAX_NUMNODES;