static void mark_port_added(VirtIOSerial *vser, uint32_t port_id)
{
    unsigned int i;

    i = port_id / 32;
    vser->ports_map[i] |= 1U << (port_id % 32);
}
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id)
{
    unsigned int i;

    i = port_id / 32;
    vser->ports_map[i] |= 1U << (port_id % 32);
}