USEC_JIFFIE_SC    259 include/linux/jiffies.h                     ((unsigned long)((((u64)NSEC_PER_USEC << USEC_JIFFIE_SC) +\
USEC_JIFFIE_SC    268 include/linux/jiffies.h #define USEC_ROUND (u64)(((u64)1 << USEC_JIFFIE_SC) - 1)
USEC_JIFFIE_SC    566 kernel/time.c  		 (USEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;