extern void free_disk_util(void);
extern void init_disk_util(struct thread_data *);
extern int update_io_ticks(void);
extern void setup_disk_util(void);
#else
#define print_disk_util(dus, agg, terse)
extern void free_disk_util(void);
extern void init_disk_util(struct thread_data *);
extern int update_io_ticks(void);
extern void setup_disk_util(void);
#else
#define print_disk_util(dus, agg, terse)