diff --git a/include/linux/key.h b/include/linux/key.h
index 3db0adc..a6b1edc 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -275,6 +275,10 @@
 	return key ? key->serial : 0;
 }
 
+#define rcu_dereference_key(KEY)					\
+	(rcu_dereference_protected((KEY)->payload.rcudata,		\
+				   rwsem_is_locked(&((struct key *)(KEY))->sem)))
+
 #ifdef CONFIG_SYSCTL
 extern ctl_table key_sysctls[];
 #endif