nvkm_vma_new
if (!(vma = nvkm_vma_new(addr, size)))
if (!(vma = nvkm_vma_new(addr, size)))
if (!(vma = nvkm_vma_new(vmm->start, vmm->limit - vmm->start)))
if (!(new = nvkm_vma_new(vma->addr + (vma->size - tail), tail)))
struct nvkm_vma *nvkm_vma_new(u64 addr, u64 size);