RXRPC_ACK__INVALID
E_(RXRPC_ACK__INVALID, "-?-")
summary.ack_reason = (sp->ack.reason < RXRPC_ACK__INVALID ?
sp->ack.reason : RXRPC_ACK__INVALID);
static const u8 rxrpc_ack_priority[RXRPC_ACK__INVALID] = {