ACTHZ 61 include/linux/jiffies.h #define TICK_NSEC (SH_DIV (1000000UL * 1000, ACTHZ, 8)) ACTHZ 68 include/linux/jiffies.h #define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV (TUSEC * USER_HZ * 1000, ACTHZ, 8)) ACTHZ 37 kernel/time/jiffies.c #define NSEC_PER_JIFFY ((u32)((((u64)NSEC_PER_SEC)<<8)/ACTHZ))