#define RCU_GP_CTR_BIT (1 << 7)
#define RCU_GP_CTR_NEST_MASK (RCU_GP_CTR_BIT - 1)

#define read_free_race	(read_generation == last_free_gen)
#define read_free	(free_done && data_access)

#ifndef READER_NEST_LEVEL
#define READER_NEST_LEVEL 2
#endif

#define REMOTE_BARRIERS