Symbol: HV_HID_ACK_SZ
sys/dev/hyperv/input/hv_hid.c
278
xact = vmbus_xact_get(sc->hs_xact_ctx, HV_HID_ACK_SZ);
sys/dev/hyperv/input/hv_hid.c
283
0, &ack, HV_HID_ACK_SZ, (uint64_t)(uintptr_t)xact);