DRM_MAJOR 1132 drivers/gpu/drm/drm_drv.c unregister_chrdev(DRM_MAJOR, "drm"); DRM_MAJOR 1154 drivers/gpu/drm/drm_drv.c ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); DRM_MAJOR 404 drivers/gpu/drm/drm_sysfs.c kdev->devt = MKDEV(DRM_MAJOR, minor->index);