1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index bd791e452ad7..67ab5febabf7 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;