trace_bits
trace_bits(if_bits, ifp->int_if_flags, 0);
trace_bits(is_bits, ifp->int_state, 0);
trace_bits(rs_bits, rt->rt_state, rt->rt_state != state);
trace_bits(rs_bits, state, 1);
trace_bits(rs_bits, rt->rt_state, 0);
trace_bits(rs_bits, RT->rt_state, 0);