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

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Message-Id: <DAWUKB7PAZG1.2K2W9VCATZ3O0@kernel.org>
Date: Fri, 27 Jun 2025 01:17:57 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Boqun Feng" <boqun.feng@...il.com>, "Danilo Krummrich"
 <dakr@...nel.org>
Cc: <gregkh@...uxfoundation.org>, <rafael@...nel.org>, <ojeda@...nel.org>,
 <alex.gaynor@...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>,
 <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 10:20 PM CEST, Boqun Feng wrote:
> On Thu, Jun 26, 2025 at 10:00:42PM +0200, Danilo Krummrich wrote:
>> diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
>> index 3958a5f44d56..74c787b352a9 100644
>> --- a/rust/kernel/types.rs
>> +++ b/rust/kernel/types.rs
>> @@ -27,6 +27,9 @@
>>  /// [`into_foreign`]: Self::into_foreign
>>  /// [`PointedTo`]: Self::PointedTo
>>  pub unsafe trait ForeignOwnable: Sized {
>> +    /// The payload type of the foreign-owned value.
>> +    type Target;
>
> I think `ForeignOwnable` also implies a `T` maybe get dropped via a
> pointer from `into_foreign()`. Not sure it's worth mentioning though.

What? How would that happen?

---
Cheers,
Benno