h63xx: initial omap board support

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

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 5240e426c1f771d24febb3ac60c8b375e794d28d..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))