linux-kernel - Re: [PATCH v2 9/9] rust: list: add ListArcField

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Message-ID: <4a713d0e-00d7-4735-b68b-fbf9edb2e282@proton.me>
Date: Mon, 27 May 2024 10:50:17 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>
Cc: Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Andreas Hindborg <a.hindborg@...sung.com>, Marco Elver <elver@...gle.com>, Kees Cook <keescook@...omium.org>, Coly Li <colyli@...e.de>, Paolo Abeni <pabeni@...hat.com>, Pierre Gondois <pierre.gondois@....com>, Ingo Molnar <mingo@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Wei Yang <richard.weiyang@...il.com>, Matthew Wilcox <willy@...radead.org>, linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 9/9] rust: list: add ListArcField

On 06.05.24 11:53, Alice Ryhl wrote:
> One way to explain what `ListArc` does is that it controls exclusive
> access to the prev/next pointer field in a refcounted object. The
> feature of having a special reference to a refcounted object with
> exclusive access to specific fields is useful for other things, so
> provide a general utility for that.
> 
> This is used by Rust Binder to keep track of which processes have a
> reference to a given node. This involves an object for each process/node
> pair, that is referenced by both the process and the node. For some
> fields in this object, only the process's reference needs to access
> them (and it needs mutable access), so Binder uses a ListArc to give the
> process's reference exclusive access.
> 
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>  rust/kernel/list.rs           |  3 ++
>  rust/kernel/list/arc_field.rs | 96 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 99 insertions(+)

Reviewed-by: Benno Lossin <benno.lossin@...ton.me>

---
Cheers,
Benno