Merge branch 'master'

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

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a740778..135bf8c 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -70,7 +70,7 @@ struct scan_control {
        unsigned int priority;
 
        /* This context's GFP mask */
-       unsigned int gfp_mask;
+       gfp_t gfp_mask;
 
        int may_writepage;
 
@@ -186,7 +186,7 @@ EXPORT_SYMBOL(remove_shrinker);
  *
  * Returns the number of slab objects which we shrunk.
  */
-static int shrink_slab(unsigned long scanned, unsigned int gfp_mask,
+static int shrink_slab(unsigned long scanned, gfp_t gfp_mask,
                        unsigned long lru_pages)
 {
        struct shrinker *shrinker;
@@ -417,7 +417,9 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
                 * Anonymous process memory has backing store?
                 * Try to allocate it some swap space here.
                 */
-               if (PageAnon(page) && !PageSwapCache(page) && sc->may_swap) {
+               if (PageAnon(page) && !PageSwapCache(page)) {
+                       if (!sc->may_swap)
+                               goto keep_locked;
                        if (!add_to_swap(page))
                                goto activate_locked;
                }
@@ -511,14 +513,15 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
                 * PageDirty _after_ making sure that the page is freeable and
                 * not in use by anybody.       (pagecache + us == 2)
                 */
-               if (page_count(page) != 2 || PageDirty(page)) {
-                       write_unlock_irq(&mapping->tree_lock);
-                       goto keep_locked;
-               }
+               if (unlikely(page_count(page) != 2))
+                       goto cannot_free;
+               smp_rmb();
+               if (unlikely(PageDirty(page)))
+                       goto cannot_free;
 
 #ifdef CONFIG_SWAP
                if (PageSwapCache(page)) {
-                       swp_entry_t swap = { .val = page->private };
+                       swp_entry_t swap = { .val = page_private(page) };
                        __delete_from_swap_cache(page);
                        write_unlock_irq(&mapping->tree_lock);
                        swap_free(swap);
@@ -538,6 +541,10 @@ free_it:
                        __pagevec_release_nonlru(&freed_pvec);
                continue;
 
+cannot_free:
+               write_unlock_irq(&mapping->tree_lock);
+               goto keep_locked;
+
 activate_locked:
                SetPageActive(page);
                pgactivate++;
@@ -921,7 +928,7 @@ shrink_caches(struct zone **zones, struct scan_control *sc)
  * holds filesystem locks which prevent writeout this might not work, and the
  * allocation attempt will fail.
  */
-int try_to_free_pages(struct zone **zones, unsigned int gfp_mask)
+int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
 {
        int priority;
        int ret = 0;
@@ -1258,9 +1265,9 @@ void wakeup_kswapd(struct zone *zone, int order)
                pgdat->kswapd_max_order = order;
        if (!cpuset_zone_allowed(zone, __GFP_HARDWALL))
                return;
-       if (!waitqueue_active(&zone->zone_pgdat->kswapd_wait))
+       if (!waitqueue_active(&pgdat->kswapd_wait))
                return;
-       wake_up_interruptible(&zone->zone_pgdat->kswapd_wait);
+       wake_up_interruptible(&pgdat->kswapd_wait);
 }
 
 #ifdef CONFIG_PM
@@ -1333,7 +1340,7 @@ module_init(kswapd_init)
 /*
  * Try to free up some pages from this zone through reclaim.
  */
-int zone_reclaim(struct zone *zone, unsigned int gfp_mask, unsigned int order)
+int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 {
        struct scan_control sc;
        int nr_pages = 1 << order;