static int config_access_valid(struct device_node *dn, int where)
static int config_access_valid(struct pci_dn *dn, int where)
static int config_access_valid(struct device_node *dn, int where){	if (where < 256)		return 1;	if (where < 4096 && dn->pci_ext_config_space)		return 1;	return 0;}