nvkm_uvfn
#define nvkm_uvfn(p) container_of((p), struct nvkm_uvfn, object)
struct nvkm_vfn *vfn = nvkm_uvfn(object)->vfn;
nvkm_uvfn = {
struct nvkm_uvfn *uvfn;
nvkm_object_ctor(&nvkm_uvfn, oclass, &uvfn->object);