uqmin
#define SATU32(x) (u_int32_t)uqmin((x), UINT_MAX)
#define SATU16(x) (u_int32_t)uqmin((x), USHRT_MAX)
#define SATU32(x) (u_int32_t)uqmin((x), UINT_MAX)
(u_int32_t)uqmin(ifp->if_baudrate, UINT_MAX);
to->mr_start = uqmin(from->mr_start, to->mr_start);