X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=mm%2Fswap.c;h=03ae2076f92fe9bd113fe55239fdcfb431cd0265;hb=4221133845f81ab4428c79a89e37be2c87624c1a;hp=e9ec06d845e808a36702c6fa64af986ece2f56a1;hpb=749dfc70554f2c9e6624ac843d66571265ed9338;p=linux-2.6-omap-h63xx.git

diff --git a/mm/swap.c b/mm/swap.c
index e9ec06d845e..03ae2076f92 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -209,19 +209,18 @@ 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 +244,6 @@ 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 +257,27 @@ 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 +345,8 @@ 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 +372,10 @@ 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 +395,8 @@ 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 +480,6 @@ 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
  */