Re: [PATCH v6 2/2] gpu: nova-core: add task for device address type wrappers

["Alexandre Courbot" <acourbot@nvidia.com>]

On Sat Apr 11, 2026 at 11:41 AM JST, John Hubbard wrote:
> Add a todo.rst entry for creating newtype wrappers around integer types
> for device addresses and sizes, with a marker trait that generic DRM
> APIs can use as a bound.
>
> Suggested-by: Danilo Krummrich <dakr@kernel.org>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> ---
>  Documentation/gpu/nova/core/todo.rst | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/Documentation/gpu/nova/core/todo.rst b/Documentation/gpu/nova/core/todo.rst
> index d5130b2b08fb..595a94e9ee2e 100644
> --- a/Documentation/gpu/nova/core/todo.rst
> +++ b/Documentation/gpu/nova/core/todo.rst
> @@ -88,6 +88,20 @@ SR-IOV [1] is work in progress.
>  | Complexity: Beginner
>  | Link: https://lore.kernel.org/all/20251119-rust-pci-sriov-v1-0-883a94599a97@redhat.com/ [1]
>  
> +Device address type wrappers
> +----------------------------
> +
> +The ``SizeConstants`` trait provides ``SZ_*`` constants as associated constants
> +on ``u32``, ``u64``, and ``usize``. Device-centric APIs such as GPU VM
> +management and buddy allocators could benefit from newtype wrappers around these
> +integer types to represent device addresses and sizes. A separate marker trait
> +could then serve as a generic bound for those wrappers.
> +
> +| Complexity: Intermediate
> +| Link: https://lore.kernel.org/all/DHJJJNP5T5FZ.2HWBMOEEKH9ZR@kernel.org/
> +| Contact: Danilo Krummrich

Danilo, do you ack being the contact for this?

Do we actually want an TODO entry for this even though we don't have a
concrete use-case for this? Nova is 64-bit only and will likely not use
this feature, so it looks out-of-place to list it here imho.