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

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Message-Id: <DAWUNZ33A0DJ.1RCZSO3S0Q1JB@kernel.org>
Date: Fri, 27 Jun 2025 01:22:45 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Danilo Krummrich" <dakr@...nel.org>, <gregkh@...uxfoundation.org>,
 <rafael@...nel.org>, <ojeda@...nel.org>, <alex.gaynor@...il.com>,
 <boqun.feng@...il.com>, <gary@...yguo.net>, <bjorn3_gh@...tonmail.com>,
 <a.hindborg@...nel.org>, <aliceryhl@...gle.com>, <tmgross@...ch.edu>,
 <david.m.ertman@...el.com>, <ira.weiny@...el.com>, <leon@...nel.org>,
 <kwilczynski@...nel.org>, <bhelgaas@...gle.com>
Cc: <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v4 4/5] rust: types: ForeignOwnable: Add type Target

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@...nel.org>
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>

Reviewed-by: Benno Lossin <lossin@...nel.org>

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(+)