nv31_mpeg_chan
struct nv31_mpeg_chan *chan = nv31_mpeg_chan(object);
nv31_mpeg_chan = {
struct nv31_mpeg_chan *chan;
nvkm_object_ctor(&nv31_mpeg_chan, oclass, &chan->object);
struct nv31_mpeg_chan *chan;
#define nv31_mpeg_chan(p) container_of((p), struct nv31_mpeg_chan, object)