rbus_round_up
rbus_round_up(rct.bussize_ioreqs[busnum], PCI_BRIDGE_IO_MIN);
rbus_round_up(rct.bussize_memreqs[busnum], PCI_BRIDGE_MEM_MIN);
rbus_round_up(rct.bussize_ioreqs[minbus], PCI_BRIDGE_IO_MIN);
rbus_round_up(rct.bussize_memreqs[minbus], 8);
unsigned int rbus_round_up(unsigned int, unsigned int);