cclock_to_ns      800 drivers/infiniband/hw/hfi1/chip.h u32 cclock_to_ns(struct hfi1_devdata *dd, u32 cclock);
cclock_to_ns     1635 drivers/infiniband/hw/hfi1/hfi.h 	u32 usec = cclock_to_ns(dd, PACKET_EGRESS_TIMEOUT) / 1000;