synchronize_kernel();
synchronize_sched();
s390_unregister_adapter_interrupt (adapter_int_handler_t handler){	int ret;	char dbf_txt[15];	CIO_TRACE_EVENT (4, "urgaint");	if (handler == NULL)		ret = -EINVAL;	else {		adapter_handler = NULL;		synchronize_kernel();		ret = 0;	}	sprintf (dbf_txt, "ret:%d", ret);	CIO_TRACE_EVENT (4, dbf_txt);	return ret;}