NSEC_JIFFIE_SC    256 include/linux/jiffies.h #define NSEC_CONVERSION ((unsigned long)((((u64)1 << NSEC_JIFFIE_SC) +\
NSEC_JIFFIE_SC    523 kernel/time.c  		 (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;