Re: [PATCH v4 4/5] rust: types: ForeignOwnable: Add type Target

[Benno Lossin]

On Thu Jun 26, 2025 at 10:00 PM CEST, Danilo Krummrich wrote:
> ForeignOwnable::Target defines the payload data of a ForeignOwnable. For
> Arc<T> for instance, ForeignOwnable::Target would just be T.
>
> This is useful for cases where a trait bound is required on the target
> type of the ForeignOwnable. For instance:
>
> 	fn example<P>(data: P)
> 	   where
> 	      P: ForeignOwnable,
> 	      P::Target: MyTrait,
> 	{}
>
> Suggested-by: Benno Lossin <lossin@xxxxxxxxxx>
> Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>

Reviewed-by: Benno Lossin <lossin@xxxxxxxxxx>

We might also be able to add a `Deref<Target = Self::Target>` bound on
`Borrowed` and `BorrowedMut`, but we should only do that when necessary.

---
Cheers,
Benno

> ---
>  rust/kernel/alloc/kbox.rs | 2 ++
>  rust/kernel/sync/arc.rs   | 1 +
>  rust/kernel/types.rs      | 4 ++++
>  3 files changed, 7 insertions(+)