DRM_IOCTL_DROP_MASTER  860 include/uapi/drm/drm.h #define DRM_IOCTL_DROP_MASTER           DRM_IO(0x1f)
DRM_IOCTL_DROP_MASTER  860 tools/include/uapi/drm/drm.h #define DRM_IOCTL_DROP_MASTER           DRM_IO(0x1f)