mmc_block: use proper sg iterators

[linux-2.6-omap-h63xx.git] / mm / swap_state.c

diff --git a/mm/swap_state.c b/mm/swap_state.c
index d8aadaf2a0baa5e87aff579039323585add00952..b8035b0551297f6ca7c2e09239d454e4707f5320 100644 (file)
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -39,7 +39,7 @@ static struct backing_dev_info swap_backing_dev_info = {
 
 struct address_space swapper_space = {
        .page_tree      = RADIX_TREE_INIT(GFP_ATOMIC|__GFP_NOWARN),
-       .tree_lock      = __RW_LOCK_UNLOCKED(swapper_space.tree_lock),
+       .tree_lock      = __SPIN_LOCK_UNLOCKED(swapper_space.tree_lock),
        .a_ops          = &swap_aops,
        .i_mmap_nonlinear = LIST_HEAD_INIT(swapper_space.i_mmap_nonlinear),
        .backing_dev_info = &swap_backing_dev_info,
@@ -56,7 +56,8 @@ static struct {
 
 void show_swap_cache_info(void)
 {
-       printk("Swap cache: add %lu, delete %lu, find %lu/%lu\n",
+       printk("%lu pages in swap cache\n", total_swapcache_pages);
+       printk("Swap cache stats: add %lu, delete %lu, find %lu/%lu\n",
                swap_cache_info.add_total, swap_cache_info.del_total,
                swap_cache_info.find_success, swap_cache_info.find_total);
        printk("Free swap  = %lukB\n", nr_swap_pages << (PAGE_SHIFT - 10));
@@ -64,7 +65,7 @@ void show_swap_cache_info(void)
 }
 
 /*
- * add_to_swap_cache resembles add_to_page_cache on swapper_space,
+ * add_to_swap_cache resembles add_to_page_cache_locked on swapper_space,
  * but sets SwapCache flag and private instead of mapping and index.
  */
 int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
@@ -76,19 +77,26 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
        BUG_ON(PagePrivate(page));
        error = radix_tree_preload(gfp_mask);
        if (!error) {
-               write_lock_irq(&swapper_space.tree_lock);
+               page_cache_get(page);
+               SetPageSwapCache(page);
+               set_page_private(page, entry.val);
+
+               spin_lock_irq(&swapper_space.tree_lock);
                error = radix_tree_insert(&swapper_space.page_tree,
                                                entry.val, page);
-               if (!error) {
-                       page_cache_get(page);
-                       SetPageSwapCache(page);
-                       set_page_private(page, entry.val);
+               if (likely(!error)) {
                        total_swapcache_pages++;
                        __inc_zone_page_state(page, NR_FILE_PAGES);
                        INC_CACHE_INFO(add_total);
                }
-               write_unlock_irq(&swapper_space.tree_lock);
+               spin_unlock_irq(&swapper_space.tree_lock);
                radix_tree_preload_end();
+
+               if (unlikely(error)) {
+                       set_page_private(page, 0UL);
+                       ClearPageSwapCache(page);
+                       page_cache_release(page);
+               }
        }
        return error;
 }
@@ -175,9 +183,9 @@ void delete_from_swap_cache(struct page *page)
 
        entry.val = page_private(page);
 
-       write_lock_irq(&swapper_space.tree_lock);
+       spin_lock_irq(&swapper_space.tree_lock);
        __delete_from_swap_cache(page);
-       write_unlock_irq(&swapper_space.tree_lock);
+       spin_unlock_irq(&swapper_space.tree_lock);
 
        swap_free(entry);
        page_cache_release(page);