//wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
//wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
int (*is_finalized)(struct channel *chan);
int (*is_disabled)(struct channel *chan);
//wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
//wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
int (*is_finalized)(struct channel *chan);
int (*is_disabled)(struct channel *chan);