linux-kernel - [PATCH 3/5] rust: helpers: Generify the definitions of rust_helper_*

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Message-ID: <20260117122243.24404-4-boqun.feng@gmail.com>
Date: Sat, 17 Jan 2026 20:22:41 +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 3/5] rust: helpers: Generify the definitions of rust_helper_*_cmpxchg*

To support atomic pointers, more cmpxchg helpers will be introduced,
hence define macros to generate these helpers to ease the introduction
of the future helpers.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 rust/helpers/atomic_ext.c | 48 ++++++++++-----------------------------
 1 file changed, 12 insertions(+), 36 deletions(-)

diff --git a/rust/helpers/atomic_ext.c b/rust/helpers/atomic_ext.c
index c5f665bbe785..240218e2e708 100644
--- a/rust/helpers/atomic_ext.c
+++ b/rust/helpers/atomic_ext.c
@@ -67,42 +67,18 @@ GEN_XCHG_HELPERS(i16, s16)
  * The architectures that currently support Rust (x86_64, armv7,
  * arm64, riscv, and loongarch) satisfy these requirements.
  */
-__rust_helper bool rust_helper_atomic_i8_try_cmpxchg(s8 *ptr, s8 *old, s8 new)
-{
-	return try_cmpxchg(ptr, old, new);
-}
-
-__rust_helper bool rust_helper_atomic_i16_try_cmpxchg(s16 *ptr, s16 *old, s16 new)
-{
-	return try_cmpxchg(ptr, old, new);
-}
-
-__rust_helper bool rust_helper_atomic_i8_try_cmpxchg_acquire(s8 *ptr, s8 *old, s8 new)
-{
-	return try_cmpxchg_acquire(ptr, old, new);
-}
-
-__rust_helper bool rust_helper_atomic_i16_try_cmpxchg_acquire(s16 *ptr, s16 *old, s16 new)
-{
-	return try_cmpxchg_acquire(ptr, old, new);
-}
-
-__rust_helper bool rust_helper_atomic_i8_try_cmpxchg_release(s8 *ptr, s8 *old, s8 new)
-{
-	return try_cmpxchg_release(ptr, old, new);
-}
-
-__rust_helper bool rust_helper_atomic_i16_try_cmpxchg_release(s16 *ptr, s16 *old, s16 new)
-{
-	return try_cmpxchg_release(ptr, old, new);
+#define GEN_TRY_CMPXCHG_HELPER(tname, type, suffix)				\
+__rust_helper bool								\
+rust_helper_atomic_##tname##_try_cmpxchg##suffix(type *ptr, type *old, type new)\
+{										\
+	return try_cmpxchg##suffix(ptr, old, new);				\
 }
 
-__rust_helper bool rust_helper_atomic_i8_try_cmpxchg_relaxed(s8 *ptr, s8 *old, s8 new)
-{
-	return try_cmpxchg_relaxed(ptr, old, new);
-}
+#define GEN_TRY_CMPXCHG_HELPERS(tname, type)					\
+	GEN_TRY_CMPXCHG_HELPER(tname, type, )					\
+	GEN_TRY_CMPXCHG_HELPER(tname, type, _acquire)				\
+	GEN_TRY_CMPXCHG_HELPER(tname, type, _release)				\
+	GEN_TRY_CMPXCHG_HELPER(tname, type, _relaxed)				\
 
-__rust_helper bool rust_helper_atomic_i16_try_cmpxchg_relaxed(s16 *ptr, s16 *old, s16 new)
-{
-	return try_cmpxchg_relaxed(ptr, old, new);
-}
+GEN_TRY_CMPXCHG_HELPERS(i8, s8)
+GEN_TRY_CMPXCHG_HELPERS(i16, s16)
-- 
2.51.0