spin_lock_init(&po->bind_lock);
mutex_init(&po->pg_vec_lock);
po->prot_hook.func = packet_rcv;
-+ po->pkt_type = PACKET_MASK_ANY & ~PACKET_LOOPBACK;
++ po->pkt_type = PACKET_MASK_ANY & ~(1 << PACKET_LOOPBACK);
if (sock->type == SOCK_PACKET)
po->prot_hook.func = packet_rcv_spkt;