3 files changed, 13 insertions, 7 deletions

diff --git a/mm/dmapool.c b/mm/dmapool.c
index b1f0885dda22..3df063706f53 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -86,10 +86,12 @@ show_pools(struct device *dev, struct device_attribute *attr, char *buf)
                 unsigned pages = 0;
                 unsigned blocks = 0;
 
+                spin_lock_irq(&pool->lock);
                 list_for_each_entry(page, &pool->page_list, page_list) {
                         pages++;
                         blocks += page->in_use;
                 }
+                spin_unlock_irq(&pool->lock);
 
                 /* per-pool info, no real statistics yet */
                 temp = scnprintf(next, size, "%-16s %4u %4Zu %4Zu %2u\n",
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7b0dcea4935b..7687879253b9 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -541,8 +541,11 @@ static void balance_dirty_pages(struct address_space *mapping)
                  * filesystems (i.e. NFS) in which data may have been
                  * written to the server's write cache, but has not yet
                  * been flushed to permanent storage.
+                 * Only move pages to writeback if this bdi is over its
+                 * threshold otherwise wait until the disk writes catch
+                 * up.
                  */
-                if (bdi_nr_reclaimable) {
+                if (bdi_nr_reclaimable > bdi_thresh) {
                         writeback_inodes(&wbc);
                         pages_written += write_chunk - wbc.nr_to_write;
                         get_dirty_limits(&background_thresh, &dirty_thresh,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5d714f8fb303..e0f2cdf9d8b1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4032,6 +4032,8 @@ static void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn)
         int i, nid;
         unsigned long usable_startpfn;
         unsigned long kernelcore_node, kernelcore_remaining;
+        /* save the state before borrow the nodemask */
+        nodemask_t saved_node_state = node_states[N_HIGH_MEMORY];
         unsigned long totalpages = early_calculate_totalpages();
         int usable_nodes = nodes_weight(node_states[N_HIGH_MEMORY]);
 
@@ -4059,7 +4061,7 @@ static void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn)
 
         /* If kernelcore was not specified, there is no ZONE_MOVABLE */
         if (!required_kernelcore)
-                return;
+                goto out;
 
         /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */
         find_usable_zone_for_movable();
@@ -4158,6 +4160,10 @@ restart:
         for (nid = 0; nid < MAX_NUMNODES; nid++)
                 zone_movable_pfn[nid] =
                         roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES);
+
+out:
+        /* restore the node_state */
+        node_states[N_HIGH_MEMORY] = saved_node_state;
 }
 
 /* Any regular memory on that node ? */
@@ -4242,11 +4248,6 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
                                                 early_node_map[i].start_pfn,
                                                 early_node_map[i].end_pfn);
 
-        /*
-         * find_zone_movable_pfns_for_nodes/early_calculate_totalpages init
-         * that node_mask, clear it at first
-         */
-        nodes_clear(node_states[N_HIGH_MEMORY]);
         /* Initialise every node */
         mminit_verify_pageflags_layout();
         setup_nr_node_ids();