1 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index bd791e452ad7..5f2052c83154 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -490,6 +490,12 @@ struct zone {
         unsigned long           managed_pages;
 
         /*
+         * Number of MIGRATE_RESEVE page block. To maintain for just
+         * optimization. Protected by zone->lock.
+         */
+        int                     nr_migrate_reserve_block;
+
+        /*
          * rarely used fields:
          */
         const char              *name;
@@ -758,10 +764,7 @@ typedef struct pglist_data {
         int kswapd_max_order;
         enum zone_type classzone_idx;
 #ifdef CONFIG_NUMA_BALANCING
-        /*
-         * Lock serializing the per destination node AutoNUMA memory
-         * migration rate limiting data.
-         */
+        /* Lock serializing the migrate rate limiting window */
         spinlock_t numabalancing_migrate_lock;
 
         /* Rate limiting time interval */