ttm_bo_mem_space
r = ttm_bo_mem_space(bo, &placement, &tmp, &ctx);
r = ttm_bo_mem_space(&bo->tbo, &bo->placement,
r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
int ttm_bo_mem_space(struct ttm_buffer_object *bo,
r = ttm_bo_mem_space(bo, &placement, &tmp_mem, &ctx);
r = ttm_bo_mem_space(bo, &placement, &tmp_mem, &ctx);
EXPORT_SYMBOL(ttm_bo_mem_space);
ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);