check_DEBUG_SLOW(const struct ofpact_null *a OVS_UNUSED,
                 const struct ofpact_check_params *cp OVS_UNUSED)
{
    return 0;
}
check_DEBUG_SLOW(const struct ofpact_null *a OVS_UNUSED,
                 const struct ofpact_check_params *cp OVS_UNUSED)
{
    return 0;
}