linux-kernel - [PATCH 0/5] Add READ_ONCE and WRITE

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Message-ID: <20251231-rwonce-v1-0-702a10b85278@google.com>
Date: Wed, 31 Dec 2025 12:22:24 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Boqun Feng <boqun.feng@...il.com>, Will Deacon <will@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>
Cc: Richard Henderson <richard.henderson@...aro.org>, Matt Turner <mattst88@...il.com>, 
	Magnus Lindholm <linmag7@...il.com>, Catalin Marinas <catalin.marinas@....com>, 
	Miguel Ojeda <ojeda@...nel.org>, 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>, Mark Rutland <mark.rutland@....com>, 
	FUJITA Tomonori <fujita.tomonori@...il.com>, Frederic Weisbecker <frederic@...nel.org>, 
	Lyude Paul <lyude@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Anna-Maria Behnsen <anna-maria@...utronix.de>, John Stultz <jstultz@...gle.com>, 
	Stephen Boyd <sboyd@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org, 
	linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	rust-for-linux@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH 0/5] Add READ_ONCE and WRITE_ONCE to Rust

There are currently a few places in the kernel where we use volatile
reads when we really should be using `READ_ONCE`. To make it possible to
replace these with proper `READ_ONCE` calls, introduce a Rust version of
`READ_ONCE`.

A new config option CONFIG_ARCH_USE_CUSTOM_READ_ONCE is introduced so
that Rust is able to use conditional compilation to implement READ_ONCE
in terms of either a volatile read, or by calling into a C helper
function, depending on the architecture.

This series is intended to be merged through ATOMIC INFRASTRUCTURE.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
Alice Ryhl (5):
      arch: add CONFIG_ARCH_USE_CUSTOM_READ_ONCE for arm64/alpha
      rust: sync: add READ_ONCE and WRITE_ONCE
      rust: sync: support using bool with READ_ONCE
      rust: hrtimer: use READ_ONCE instead of read_volatile
      rust: fs: use READ_ONCE instead of read_volatile

 MAINTAINERS                     |   2 +
 arch/Kconfig                    |  11 +++
 arch/alpha/Kconfig              |   1 +
 arch/alpha/include/asm/rwonce.h |   4 +-
 arch/arm64/Kconfig              |   1 +
 arch/arm64/include/asm/rwonce.h |   4 +-
 rust/helpers/helpers.c          |   1 +
 rust/helpers/rwonce.c           |  34 +++++++
 rust/kernel/fs/file.rs          |   8 +-
 rust/kernel/sync.rs             |   2 +
 rust/kernel/sync/rwonce.rs      | 207 ++++++++++++++++++++++++++++++++++++++++
 rust/kernel/time/hrtimer.rs     |   8 +-
 12 files changed, 268 insertions(+), 15 deletions(-)
---
base-commit: f8f9c1f4d0c7a64600e2ca312dec824a0bc2f1da
change-id: 20251230-rwonce-1e8d2ee0bcf9

Best regards,
-- 
Alice Ryhl <aliceryhl@...gle.com>