/* If the headers do not support SYS_membarrier, statically use RCU_MB */
#ifdef SYS_membarrier
-#define membarrier(...) syscall(__NR_membarrier, __VA_ARGS__)
+# define MEMBARRIER_EXPEDITED (1 << 0)
+# define MEMBARRIER_DELAYED (1 << 1)
+# define membarrier(...) syscall(__NR_membarrier, __VA_ARGS__)
#else
-#undef RCU_MEMBARRIER
-#define RCU_MB
+# undef RCU_MEMBARRIER
+# define RCU_MB
#endif
#endif