linux-kernel - Re: [PATCH v2 1/2] rust: clk: implement Send and Sync

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Message-ID: <ghaqgzgnk6mkv6tm4inm2e24jyidsk7qhbff6zwc46kefojw5p@3jvwnn3q4bxw>
Date: Wed, 22 Oct 2025 09:21:38 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, Daniel Almeida <daniel.almeida@...labora.com>, 
	linux-clk@...r.kernel.org, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] rust: clk: implement Send and Sync

On 20-10-25, 09:35, Alice Ryhl wrote:
> These traits are required for drivers to embed the Clk type in their own
> data structures because driver data structures are usually required to
> be Send. Since the Clk type is thread-safe, implement the relevant
> traits.
> 
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>  rust/kernel/clk.rs | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/rust/kernel/clk.rs b/rust/kernel/clk.rs
> index 1e6c8c42fb3a321951e275101848b35e1ae5c2a8..0a290202da69669d670ddad2b6762a1d5f1d912e 100644
> --- a/rust/kernel/clk.rs
> +++ b/rust/kernel/clk.rs
> @@ -129,6 +129,13 @@ mod common_clk {
>      #[repr(transparent)]
>      pub struct Clk(*mut bindings::clk);
>  
> +    // SAFETY: It is safe to call `clk_put` on another thread than where `clk_get` was called.
> +    unsafe impl Send for Clk {}
> +
> +    // SAFETY: It is safe to call any combination of the `&self` methods in parallel, as the
> +    // methods are synchronized internally.
> +    unsafe impl Sync for Clk {}
> +
>      impl Clk {
>          /// Gets [`Clk`] corresponding to a [`Device`] and a connection id.
>          ///

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh