linux-kernel - Re: [PATCH v1 2/2] rust: sync: implement `AsRef<T>` for `Arc<T>`

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Message-ID: <DT_8UBvti_dML0vOrXVfUwNnTjhHlhBsioFDBIudjzzxjJl1SCTHU6cn5qjmZj3wTt7r8R1PFDStDv2C2IAjMj4Ubbpy5r587LkyfJEa4VY=@proton.me>
Date:   Thu, 25 May 2023 13:50:57 +0000
From:   Benno Lossin <benno.lossin@...ton.me>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev,
        Wedson Almeida Filho <walmeida@...rosoft.com>
Subject: Re: [PATCH v1 2/2] rust: sync: implement `AsRef<T>` for `Arc<T>`

On 5/17/23 22:08, Alice Ryhl wrote:
> This trait lets you use `Arc<T>` in code that is generic over smart
> pointer types.
> 
> The `AsRef` trait should be implemented on all smart pointers. The
> standard library also implements it on the ordinary `Arc`.
> 
> Co-developed-by: Wedson Almeida Filho <walmeida@...rosoft.com>
> Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

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

> ---
>   rust/kernel/sync/arc.rs | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
> index 274febe3bb06..9ec911e4a0c7 100644
> --- a/rust/kernel/sync/arc.rs
> +++ b/rust/kernel/sync/arc.rs
> @@ -264,6 +264,12 @@ impl<T: ?Sized> Deref for Arc<T> {
>       }
>   }
> 
> +impl<T: ?Sized> AsRef<T> for Arc<T> {
> +    fn as_ref(&self) -> &T {
> +        self.deref()
> +    }
> +}
> +
>   impl<T: ?Sized> Clone for Arc<T> {
>       fn clone(&self) -> Self {
>           // INVARIANT: C `refcount_inc` saturates the refcount, so it cannot overflow to zero.
> --
> 2.40.1.606.ga4b1b128d6-goog
> 

-- 
Cheers,
Benno