+#ifdef RCU_MEMBARRIER
+#define rcu_read_lock_memb() _rcu_read_lock()
+#define rcu_read_unlock_memb() _rcu_read_unlock()
+#elif defined(RCU_SIGNAL)
+#define rcu_read_lock_sig() _rcu_read_lock()
+#define rcu_read_unlock_sig() _rcu_read_unlock()
+#elif defined(RCU_MB)
+#define rcu_read_lock_mb() _rcu_read_lock()
+#define rcu_read_unlock_mb() _rcu_read_unlock()
+#endif