linux-kernel - Re: [PATCH v2 3/8] rust: sync: add `Arc::{from_raw, into

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Message-ID: <20230601182628.13765998.gary@garyguo.net>
Date:   Thu, 1 Jun 2023 18:26:28 +0100
From:   Gary Guo <gary@...yguo.net>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     rust-for-linux@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "Björn Roy Baron" <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Wedson Almeida Filho <walmeida@...rosoft.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>
Subject: Re: [PATCH v2 3/8] rust: sync: add `Arc::{from_raw, into_raw}`

On Thu,  1 Jun 2023 13:49:41 +0000
Alice Ryhl <aliceryhl@...gle.com> wrote:

> From: Wedson Almeida Filho <walmeida@...rosoft.com>
> 
> These methods can be used to turn an `Arc` into a raw pointer and back,
> in a way that preserves the metadata for fat pointers.
> 
> This is done using the unstable ptr_metadata feature [1]. However, it
> could also be done using the unstable pointer_byte_offsets feature [2],
> which is likely to have a shorter path to stabilization than
> ptr_metadata.
> 
> Link: https://github.com/rust-lang/rust/issues/81513 [1]
> Link: https://github.com/rust-lang/rust/issues/96283 [2]
> Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
> Co-developed-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>

Reviewed-by: Gary Guo <gary@...yguo.net>

> ---
>  rust/kernel/lib.rs      |  1 +
>  rust/kernel/sync/arc.rs | 42 ++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 42 insertions(+), 1 deletion(-)