minmax_running_min
u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);
EXPORT_SYMBOL(minmax_running_min);
minmax_running_min(&tp->rtt_min, wlen, tcp_jiffies32,
minmax_running_min(&call->min_rtt, wlen_us, resp_time / 1024,