    OVS_REQUIRES(ct->ct_lock)
{
    struct zone_limit *zl = zone_limit_lookup(ct, zone);
    return zl ? zl : zone_limit_lookup(ct, DEFAULT_ZONE);
}
    OVS_REQUIRES(ct->ct_lock)
{
    struct zone_limit *zl = zone_limit_lookup(ct, zone);
    return zl ? zl : zone_limit_lookup(ct, DEFAULT_ZONE);
}