Pull trivial into release branch

[pandora-kernel.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index ba2453f..e9b161b 100644 (file)
--- 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;
@@ -952,7 +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;