Pull bugzilla-5737 into release branch

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

diff --git a/mm/swap.c b/mm/swap.c
index e9ec06d..990868a 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -86,8 +86,7 @@ int rotate_reclaimable_page(struct page *page)
        zone = page_zone(page);
        spin_lock_irqsave(&zone->lru_lock, flags);
        if (PageLRU(page) && !PageActive(page)) {
-               list_del(&page->lru);
-               list_add_tail(&page->lru, &zone->inactive_list);
+               list_move_tail(&page->lru, &zone->inactive_list);
                inc_page_state(pgrotated);
        }
        if (!test_clear_page_writeback(page))
@@ -209,19 +208,18 @@ int lru_add_drain_all(void)
  */
 void fastcall __page_cache_release(struct page *page)
 {
-       unsigned long flags;
-       struct zone *zone = page_zone(page);
+       if (PageLRU(page)) {
+               unsigned long flags;
+               struct zone *zone = page_zone(page);
 
-       spin_lock_irqsave(&zone->lru_lock, flags);
-       if (TestClearPageLRU(page))
+               spin_lock_irqsave(&zone->lru_lock, flags);
+               BUG_ON(!PageLRU(page));
+               __ClearPageLRU(page);
                del_page_from_lru(zone, page);
-       if (page_count(page) != 0)
-               page = NULL;
-       spin_unlock_irqrestore(&zone->lru_lock, flags);
-       if (page)
-               free_hot_page(page);
+               spin_unlock_irqrestore(&zone->lru_lock, flags);
+       }
+       free_hot_page(page);
 }
-
 EXPORT_SYMBOL(__page_cache_release);
 
 /*
@@ -245,7 +243,6 @@ void release_pages(struct page **pages, int nr, int cold)
        pagevec_init(&pages_to_free, cold);
        for (i = 0; i < nr; i++) {
                struct page *page = pages[i];
-               struct zone *pagezone;
 
                if (unlikely(PageCompound(page))) {
                        if (zone) {
@@ -259,23 +256,27 @@ void release_pages(struct page **pages, int nr, int cold)
                if (!put_page_testzero(page))
                        continue;
 
-               pagezone = page_zone(page);
-               if (pagezone != zone) {
-                       if (zone)
-                               spin_unlock_irq(&zone->lru_lock);
-                       zone = pagezone;
-                       spin_lock_irq(&zone->lru_lock);
-               }
-               if (TestClearPageLRU(page))
+               if (PageLRU(page)) {
+                       struct zone *pagezone = page_zone(page);
+                       if (pagezone != zone) {
+                               if (zone)
+                                       spin_unlock_irq(&zone->lru_lock);
+                               zone = pagezone;
+                               spin_lock_irq(&zone->lru_lock);
+                       }
+                       BUG_ON(!PageLRU(page));
+                       __ClearPageLRU(page);
                        del_page_from_lru(zone, page);
-               if (page_count(page) == 0) {
-                       if (!pagevec_add(&pages_to_free, page)) {
+               }
+
+               if (!pagevec_add(&pages_to_free, page)) {
+                       if (zone) {
                                spin_unlock_irq(&zone->lru_lock);
-                               __pagevec_free(&pages_to_free);
-                               pagevec_reinit(&pages_to_free);
-                               zone = NULL;    /* No lock is held */
+                               zone = NULL;
                        }
-               }
+                       __pagevec_free(&pages_to_free);
+                       pagevec_reinit(&pages_to_free);
+               }
        }
        if (zone)
                spin_unlock_irq(&zone->lru_lock);
@@ -343,8 +344,8 @@ void __pagevec_lru_add(struct pagevec *pvec)
                        zone = pagezone;
                        spin_lock_irq(&zone->lru_lock);
                }
-               if (TestSetPageLRU(page))
-                       BUG();
+               BUG_ON(PageLRU(page));
+               SetPageLRU(page);
                add_page_to_inactive_list(zone, page);
        }
        if (zone)
@@ -370,10 +371,10 @@ void __pagevec_lru_add_active(struct pagevec *pvec)
                        zone = pagezone;
                        spin_lock_irq(&zone->lru_lock);
                }
-               if (TestSetPageLRU(page))
-                       BUG();
-               if (TestSetPageActive(page))
-                       BUG();
+               BUG_ON(PageLRU(page));
+               SetPageLRU(page);
+               BUG_ON(PageActive(page));
+               SetPageActive(page);
                add_page_to_active_list(zone, page);
        }
        if (zone)
@@ -393,7 +394,8 @@ void pagevec_strip(struct pagevec *pvec)
                struct page *page = pvec->pages[i];
 
                if (PagePrivate(page) && !TestSetPageLocked(page)) {
-                       try_to_release_page(page, 0);
+                       if (PagePrivate(page))
+                               try_to_release_page(page, 0);
                        unlock_page(page);
                }
        }
@@ -477,48 +479,6 @@ static int cpu_swap_callback(struct notifier_block *nfb,
 #endif /* CONFIG_HOTPLUG_CPU */
 #endif /* CONFIG_SMP */
 
-#ifdef CONFIG_SMP
-void percpu_counter_mod(struct percpu_counter *fbc, long amount)
-{
-       long count;
-       long *pcount;
-       int cpu = get_cpu();
-
-       pcount = per_cpu_ptr(fbc->counters, cpu);
-       count = *pcount + amount;
-       if (count >= FBC_BATCH || count <= -FBC_BATCH) {
-               spin_lock(&fbc->lock);
-               fbc->count += count;
-               *pcount = 0;
-               spin_unlock(&fbc->lock);
-       } else {
-               *pcount = count;
-       }
-       put_cpu();
-}
-EXPORT_SYMBOL(percpu_counter_mod);
-
-/*
- * Add up all the per-cpu counts, return the result.  This is a more accurate
- * but much slower version of percpu_counter_read_positive()
- */
-long percpu_counter_sum(struct percpu_counter *fbc)
-{
-       long ret;
-       int cpu;
-
-       spin_lock(&fbc->lock);
-       ret = fbc->count;
-       for_each_cpu(cpu) {
-               long *pcount = per_cpu_ptr(fbc->counters, cpu);
-               ret += *pcount;
-       }
-       spin_unlock(&fbc->lock);
-       return ret < 0 ? 0 : ret;
-}
-EXPORT_SYMBOL(percpu_counter_sum);
-#endif
-
 /*
  * Perform any setup for the swap system
  */