--- /dev/null
+
+#define read_free_race (read_generation[0] == last_free_gen)
+#define read_free (free_done && data_access[0])
+
+#define RCU_GP_CTR_BIT (1 << 7)
+#define RCU_GP_CTR_NEST_MASK (RCU_GP_CTR_BIT - 1)
+
+//FIXME
+//#define REMOTE_BARRIERS