diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 14c040b..5ce197e 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -283,7 +283,7 @@
 	struct rcu_node *level[NUM_RCU_LVLS];	/* Hierarchy levels. */
 	u32 levelcnt[MAX_RCU_LVLS + 1];		/* # nodes in each level. */
 	u8 levelspread[NUM_RCU_LVLS];		/* kids/node in each level. */
-	struct rcu_data *rda[NR_CPUS];		/* array of rdp pointers. */
+	struct rcu_data __percpu *rda;		/* pointer of percu rcu_data. */
 
 	/* The following fields are guarded by the root rcu_node's lock. */