1 files changed, 24 insertions, 31 deletions

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 63807583d8e8..61119b8a11e6 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -191,6 +191,25 @@ static unsigned long writeout_period_time = 0;
  * global dirtyable memory first.
  */
 
+/**
+ * zone_dirtyable_memory - number of dirtyable pages in a zone
+ * @zone: the zone
+ *
+ * Returns the zone's number of pages potentially available for dirty
+ * page cache.  This is the base value for the per-zone dirty limits.
+ */
+static unsigned long zone_dirtyable_memory(struct zone *zone)
+{
+        unsigned long nr_pages;
+
+        nr_pages = zone_page_state(zone, NR_FREE_PAGES);
+        nr_pages -= min(nr_pages, zone->dirty_balance_reserve);
+
+        nr_pages += zone_reclaimable_pages(zone);
+
+        return nr_pages;
+}
+
 static unsigned long highmem_dirtyable_memory(unsigned long total)
 {
 #ifdef CONFIG_HIGHMEM
@@ -198,11 +217,9 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
         unsigned long x = 0;
 
         for_each_node_state(node, N_HIGH_MEMORY) {
-                struct zone *z =
-                        &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
+                struct zone *z = &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
 
-                x += zone_page_state(z, NR_FREE_PAGES) +
-                     zone_reclaimable_pages(z) - z->dirty_balance_reserve;
+                x += zone_dirtyable_memory(z);
         }
         /*
          * Unreclaimable memory (kernel memory or anonymous memory
@@ -238,9 +255,11 @@ static unsigned long global_dirtyable_memory(void)
 {
         unsigned long x;
 
-        x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
+        x = global_page_state(NR_FREE_PAGES);
         x -= min(x, dirty_balance_reserve);
 
+        x += global_reclaimable_pages();
+
         if (!vm_highmem_is_dirtyable)
                 x -= highmem_dirtyable_memory(x);
 
@@ -289,32 +308,6 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
 }
 
 /**
- * zone_dirtyable_memory - number of dirtyable pages in a zone
- * @zone: the zone
- *
- * Returns the zone's number of pages potentially available for dirty
- * page cache.  This is the base value for the per-zone dirty limits.
- */
-static unsigned long zone_dirtyable_memory(struct zone *zone)
-{
-        /*
-         * The effective global number of dirtyable pages may exclude
-         * highmem as a big-picture measure to keep the ratio between
-         * dirty memory and lowmem reasonable.
-         *
-         * But this function is purely about the individual zone and a
-         * highmem zone can hold its share of dirty pages, so we don't
-         * care about vm_highmem_is_dirtyable here.
-         */
-        unsigned long nr_pages = zone_page_state(zone, NR_FREE_PAGES) +
-                zone_reclaimable_pages(zone);
-
-        /* don't allow this to underflow */
-        nr_pages -= min(nr_pages, zone->dirty_balance_reserve);
-        return nr_pages;
-}
-
-/**
  * zone_dirty_limit - maximum number of dirty pages allowed in a zone
  * @zone: the zone
  *