1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 98f079bcf399..64b2c3a48286 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -478,6 +478,14 @@ struct zone {
          * rarely used fields:
          */
         const char              *name;
+#ifdef CONFIG_MEMORY_ISOLATION
+        /*
+         * the number of MIGRATE_ISOLATE *pageblock*.
+         * We need this for free page counting. Look at zone_watermark_ok_safe.
+         * It's protected by zone->lock
+         */
+        int             nr_pageblock_isolate;
+#endif
 } ____cacheline_internodealigned_in_smp;
 
 typedef enum {