__iter_div_u64_rem
ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
vdso_ts->sec += __iter_div_u64_rem(nsec, NSEC_PER_SEC, &vdso_ts->nsec);
vdso_ts->sec += __iter_div_u64_rem(nsec, NSEC_PER_SEC, &nsec);
return __iter_div_u64_rem(dividend, divisor, remainder);
ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);