[ARM] 3030/2: fix permission check in the obscur cmpxchg syscall

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

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0166ea15c9ee8d61f08ddc6e100de841e59205c7..945559fb63d208bb5c10543aece7b117e84d3e97 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -46,7 +46,7 @@
 static long ratelimit_pages = 32;
 
 static long total_pages;       /* The total number of pages in the machine. */
-static int dirty_exceeded;     /* Dirty mem may be over limit */
+static int dirty_exceeded __cacheline_aligned_in_smp;  /* Dirty mem may be over limit */
 
 /*
  * When balance_dirty_pages decides that the caller needs to perform some
@@ -212,7 +212,8 @@ static void balance_dirty_pages(struct address_space *mapping)
                if (nr_reclaimable + wbs.nr_writeback <= dirty_thresh)
                        break;
 
-               dirty_exceeded = 1;
+               if (!dirty_exceeded)
+                       dirty_exceeded = 1;
 
                /* Note: nr_reclaimable denotes nr_dirty + nr_unstable.
                 * Unstable writes are a feature of certain networked
@@ -234,7 +235,7 @@ static void balance_dirty_pages(struct address_space *mapping)
                blk_congestion_wait(WRITE, HZ/10);
        }
 
-       if (nr_reclaimable + wbs.nr_writeback <= dirty_thresh)
+       if (nr_reclaimable + wbs.nr_writeback <= dirty_thresh && dirty_exceeded)
                dirty_exceeded = 0;
 
        if (writeback_in_progress(bdi))
@@ -550,11 +551,17 @@ void __init page_writeback_init(void)
 
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
 {
+       int ret;
+
        if (wbc->nr_to_write <= 0)
                return 0;
+       wbc->for_writepages = 1;
        if (mapping->a_ops->writepages)
-               return mapping->a_ops->writepages(mapping, wbc);
-       return generic_writepages(mapping, wbc);
+               ret =  mapping->a_ops->writepages(mapping, wbc);
+       else
+               ret = generic_writepages(mapping, wbc);
+       wbc->for_writepages = 0;
+       return ret;
 }
 
 /**