linux-kernel - Re: [PATCH v5 6/7] rust: Add read_poll

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Message-ID: <Zyuy25viG51DDRk7@Boquns-Mac-mini.local>
Date: Wed, 6 Nov 2024 10:18:03 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: anna-maria@...utronix.de, frederic@...nel.org, tglx@...utronix.de,
	jstultz@...gle.com, sboyd@...nel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, rust-for-linux@...r.kernel.org,
	andrew@...n.ch, hkallweit1@...il.com, tmgross@...ch.edu,
	ojeda@...nel.org, alex.gaynor@...il.com, gary@...yguo.net,
	bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
	a.hindborg@...sung.com, aliceryhl@...gle.com, arnd@...db.de
Subject: Re: [PATCH v5 6/7] rust: Add read_poll_timeout functions

On Fri, Nov 01, 2024 at 10:01:20AM +0900, FUJITA Tomonori wrote:
[...]
> @@ -44,6 +45,7 @@
>  pub mod page;
>  pub mod prelude;
>  pub mod print;
> +pub mod processor;
>  pub mod sizes;
>  pub mod rbtree;
>  mod static_assert;
> diff --git a/rust/kernel/processor.rs b/rust/kernel/processor.rs
> new file mode 100644
> index 000000000000..eeeff4be84fa
> --- /dev/null
> +++ b/rust/kernel/processor.rs

What else would we put into this file? `smp_processor_id()` and IPI
functionality? If so, I would probably want to rename this to cpu.rs.

Regards,
Boqun

> @@ -0,0 +1,13 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +//! Processor related primitives.
> +//!
> +//! C header: [`include/linux/processor.h`](srctree/include/linux/processor.h).
> +
> +/// Lower CPU power consumption or yield to a hyperthreaded twin processor.
> +///
> +/// It also happens to serve as a compiler barrier.
> +pub fn cpu_relax() {
> +    // SAFETY: FFI call.
> +    unsafe { bindings::cpu_relax() }
> +}
> -- 
> 2.43.0
> 
>