[RFC 7/9] Save flags in swap.c

[Christoph Lameter <clameter@sgi.com>]

We need to call various LRU management functions with interrupts
disabled for atomic reclaim. Make them save flags.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 mm/swap.c |   22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

Index: linux-2.6/mm/swap.c
===================================================================
--- linux-2.6.orig/mm/swap.c	2007-08-14 08:00:57.000000000 -0700
+++ linux-2.6/mm/swap.c	2007-08-14 08:03:50.000000000 -0700
@@ -140,15 +140,16 @@ int rotate_reclaimable_page(struct page 
 void fastcall activate_page(struct page *page)
 {
 	struct zone *zone = page_zone(page);
+	unsigned long flags;
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irqsave(&zone->lru_lock, flags);
 	if (PageLRU(page) && !PageActive(page)) {
 		del_page_from_inactive_list(zone, page);
 		SetPageActive(page);
 		add_page_to_active_list(zone, page);
 		__count_vm_event(PGACTIVATE);
 	}
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irqrestore(&zone->lru_lock, flags);
 }
 
 /*
@@ -258,6 +259,7 @@ void release_pages(struct page **pages, 
 	int i;
 	struct pagevec pages_to_free;
 	struct zone *zone = NULL;
+	unsigned long flags = 0;
 
 	pagevec_init(&pages_to_free, cold);
 	for (i = 0; i < nr; i++) {
@@ -281,7 +283,7 @@ void release_pages(struct page **pages, 
 				if (zone)
 					spin_unlock_irq(&zone->lru_lock);
 				zone = pagezone;
-				spin_lock_irq(&zone->lru_lock);
+				spin_lock_irqsave(&zone->lru_lock, flags);
 			}
 			VM_BUG_ON(!PageLRU(page));
 			__ClearPageLRU(page);
@@ -298,7 +300,7 @@ void release_pages(struct page **pages, 
   		}
 	}
 	if (zone)
-		spin_unlock_irq(&zone->lru_lock);
+		spin_unlock_irqrestore(&zone->lru_lock, flags);
 
 	pagevec_free(&pages_to_free);
 }
@@ -352,6 +354,7 @@ void __pagevec_lru_add(struct pagevec *p
 {
 	int i;
 	struct zone *zone = NULL;
+	unsigned long flags = 0;
 
 	for (i = 0; i < pagevec_count(pvec); i++) {
 		struct page *page = pvec->pages[i];
@@ -361,14 +364,14 @@ void __pagevec_lru_add(struct pagevec *p
 			if (zone)
 				spin_unlock_irq(&zone->lru_lock);
 			zone = pagezone;
-			spin_lock_irq(&zone->lru_lock);
+			spin_lock_irqsave(&zone->lru_lock, flags);
 		}
 		VM_BUG_ON(PageLRU(page));
 		SetPageLRU(page);
 		add_page_to_inactive_list(zone, page);
 	}
 	if (zone)
-		spin_unlock_irq(&zone->lru_lock);
+		spin_unlock_irqrestore(&zone->lru_lock, flags);
 	release_pages(pvec->pages, pvec->nr, pvec->cold);
 	pagevec_reinit(pvec);
 }
@@ -379,6 +382,7 @@ void __pagevec_lru_add_active(struct pag
 {
 	int i;
 	struct zone *zone = NULL;
+	unsigned long flags = 0;
 
 	for (i = 0; i < pagevec_count(pvec); i++) {
 		struct page *page = pvec->pages[i];
@@ -386,9 +390,9 @@ void __pagevec_lru_add_active(struct pag
 
 		if (pagezone != zone) {
 			if (zone)
-				spin_unlock_irq(&zone->lru_lock);
+				spin_unlock_irqrestore(&zone->lru_lock, flags);
 			zone = pagezone;
-			spin_lock_irq(&zone->lru_lock);
+			spin_lock_irqsave(&zone->lru_lock, flags);
 		}
 		VM_BUG_ON(PageLRU(page));
 		SetPageLRU(page);
@@ -397,7 +401,7 @@ void __pagevec_lru_add_active(struct pag
 		add_page_to_active_list(zone, page);
 	}
 	if (zone)
-		spin_unlock_irq(&zone->lru_lock);
+		spin_unlock_irqrestore(&zone->lru_lock, flags);
 	release_pages(pvec->pages, pvec->nr, pvec->cold);
 	pagevec_reinit(pvec);
 }

-- 
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