Re: [PATCH v5 07/19] rust: drm: restrict AlwaysRefCounted to Normal GEM Object context

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

On Sun Jun 28, 2026 at 11:53 PM JST, Danilo Krummrich wrote:
> Restrict AlwaysRefCounted for gem::Object and gem::shmem::Object to the
> Normal context, since only Normal objects should be independently
> reference-counted.
>
> To avoid cascading through IntoGEMObject (which had AlwaysRefCounted as
> a supertrait), remove AlwaysRefCounted from IntoGEMObject's supertraits
> and instead add it as an explicit bound on lookup_handle(), which is the
> only BaseObject method that returns an ARef.
>
> Since Object::new() and shmem::Object::new() return ARef<Self>, move
> them to Normal-only impl blocks. Similarly, simplify ObjectConfig and
> shmem's parent_resv_obj field to the Normal context.
>
> Remove the DeviceContext generic from DriverObject::new() and
> Driver::Object, since GEM objects can only be constructed in the Normal
> context. Simplify DriverAllocImpl accordingly.

I think this last item could be its own patch - it wouldn't introduce
any extra churn, and would separate the concepts (restricting GEM
references to `Normal` context, and updating the API) nicely, making the
first patch a bit more focused (~+20/-35 LoCs extracted from it).

But even without this,

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>