NSEC_PER_USEC
(s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
(s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
(s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
return kt / NSEC_PER_USEC;
return (ktime_add_ns(kt, us * NSEC_PER_USEC));
tv->tv_usec * NSEC_PER_USEC;