update_global_total_pages
update_global_total_pages(bo->bdev, -(long)tt->num_pages);
update_global_total_pages(bo->bdev, -(long)tt->num_pages);
update_global_total_pages(ttm_dev, tt->num_pages);
update_global_total_pages(ttm_dev, -(long)tt->num_pages);