linux-kernel - [PATCH 0/5] rust: sync: Atomic pointer and RCU

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Message-ID: <20260117122243.24404-1-boqun.feng@gmail.com>
Date: Sat, 17 Jan 2026 20:22:38 +0800
From: Boqun Feng <boqun.feng@...il.com>
To: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org
Cc: 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>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Josh Triplett <josh@...htriplett.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang@...ux.dev>,
	FUJITA Tomonori <fujita.tomonori@...il.com>
Subject: [PATCH 0/5] rust: sync: Atomic pointer and RCU

Hi,

This is a respin of my previous RCU pointer patch [1]. RCU protected
pointers maps to a "struct foo __rcu *" on the C side, which although
RCU has its own API, but fundamentally it's a pointer that are operated
atomically, hence using Rust's atomic (pointer) API provides the
necessary atomic + ordering.

Although asynchronous reclaim is not in the current implementation, but
it should be easy to extend.

[1]: https://lore.kernel.org/rust-for-linux/20250421164221.1121805-13-boqun.feng@gmail.com/

Regards,
Boqun

Boqun Feng (5):
  rust: helpers: Generify the definitions of rust_helper_*_{read,set}*
  rust: helpers: Generify the definitions of rust_helper_*_xchg*
  rust: helpers: Generify the definitions of rust_helper_*_cmpxchg*
  rust: sync: atomic: Add Atomic<*mut T> support
  rust: sync: rcu: Add RCU protected pointer

 rust/helpers/atomic_ext.c            | 158 +++++--------
 rust/kernel/sync/atomic.rs           |  12 +-
 rust/kernel/sync/atomic/internal.rs  |  21 +-
 rust/kernel/sync/atomic/predefine.rs |  23 ++
 rust/kernel/sync/rcu.rs              | 326 ++++++++++++++++++++++++++-
 5 files changed, 427 insertions(+), 113 deletions(-)

-- 
2.51.0