1 files changed, 4 insertions, 3 deletions

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 5240e426c1f7..945559fb63d2 100644
--- 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))