Index: kernel/generic/include/synch/rcu_types.h
===================================================================
--- kernel/generic/include/synch/rcu_types.h	(revision 9fe9d296d25d20339552aebcfe9b776a1bf262f8)
+++ kernel/generic/include/synch/rcu_types.h	(revision 853d613674dd858ae7ed3518ec21cc3a354747c5)
@@ -40,6 +40,5 @@
 
 #if !defined(RCU_PREEMPT_PODZIMEK) && !defined(RCU_PREEMPT_A)
-#define RCU_PREEMPT_A
-//#error You must select an RCU algorithm.
+#error You must select an RCU algorithm.
 #endif