USB_DEVICE_MAJOR
if (imajor(inode) == USB_DEVICE_MAJOR)
#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
USB_DEVICE_MAJOR);
udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
#ifndef USB_DEVICE_MAJOR
if (file->dev_maj == USB_DEVICE_MAJOR)