PCI_SEC_LATENCY_TIMER_MASK
buses & PCI_SEC_LATENCY_TIMER_MASK);
buses = (buses & PCI_SEC_LATENCY_TIMER_MASK) |
buses & PCI_SEC_LATENCY_TIMER_MASK);
buses = (buses & PCI_SEC_LATENCY_TIMER_MASK) |
FIELD_MODIFY(PCI_SEC_LATENCY_TIMER_MASK, &buses, CARDBUS_LATENCY_TIMER);