linux-kernel - Re: [PATCH 08/22] rust: pin-init: move `InPlaceInit` and impls of `InPlaceWrite` into the kernel crate

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Message-ID: <D88BIUUNXQK5.3BFLFUBWAS0H2@proton.me>
Date: Wed, 05 Mar 2025 12:06:52 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: Danilo Krummrich <dakr@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/22] rust: pin-init: move `InPlaceInit` and impls of `InPlaceWrite` into the kernel crate

On Wed Mar 5, 2025 at 12:18 PM CET, Andreas Hindborg wrote:
> "Benno Lossin" <benno.lossin@...ton.me> writes:
>
>> In order to make pin-init a standalone crate, move kernel-specific code
>> directly into the kernel crate. This includes the `InPlaceInit<T>`
>> trait, its implementations and the implementations of `InPlaceWrite` for
>> `Arc` and `UniqueArc`. All of these use the kernel's error type which
>> will become unavailable in pin-init.
>>
>> Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
>> ---
>>  rust/kernel/alloc/kbox.rs |   3 +-
>>  rust/kernel/init.rs       |  55 +++++++++++++++++
>>  rust/kernel/prelude.rs    |   3 +-
>>  rust/kernel/sync/arc.rs   |  65 +++++++++++++++++++-
>>  rust/pin-init/src/lib.rs  | 125 ++------------------------------------
>>  5 files changed, 127 insertions(+), 124 deletions(-)
>>
>
> [...]
>
>> --- a/rust/pin-init/src/lib.rs
>> +++ b/rust/pin-init/src/lib.rs
>> @@ -10,7 +10,7 @@
>>  //! To initialize a `struct` with an in-place constructor you will need two things:
>>  //! - an in-place constructor,
>>  //! - a memory location that can hold your `struct` (this can be the [stack], an [`Arc<T>`],
>> -//!   [`UniqueArc<T>`], [`KBox<T>`] or any other smart pointer that implements [`InPlaceInit`]).
>> +//!   [`KBox<T>`] or any other smart pointer that supports this library).
>
> Would you not want to remove references to `KBox` here as well? Even
> though you don't have to move the impl, I don't imagine `KBox` exist in
> user space?

Yes, this is done in "rust: pin-init: fix documentation links".

---
Cheers,
Benno