nvkm_vma_tail
if (!(vma = nvkm_vma_tail(vma, vma->size + vma->addr - addr)))
if (!(tmp = nvkm_vma_tail(vma, vma->size - size))) {
if (!(tmp = nvkm_vma_tail(vma, vma->size + vma->addr - addr))) {
if (!(tmp = nvkm_vma_tail(vma, vma->size - size))) {
struct nvkm_vma *nvkm_vma_tail(struct nvkm_vma *, u64 tail);