VTIME_PER_USEC
VRATE_MIN = VTIME_PER_USEC * VRATE_MIN_PPM / MILLION,
ioc->vtime_base_rate = VTIME_PER_USEC;
atomic64_set(&ioc->vtime_rate, VTIME_PER_USEC);
VTIME_PER_USEC);
vrate_pct = div64_u64(ioc->vtime_base_rate * 100, VTIME_PER_USEC);
atomic64_set(&ioc->vtime_rate, VTIME_PER_USEC);
ioc->vtime_base_rate = VTIME_PER_USEC;
VTIME_PER_USEC, MILLION);
VTIME_PER_USEC, MILLION);