linux-kernel - [PATCH 1/5] rust: helpers: Generify the definitions of rust_helper_*

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Message-ID: <20260117122243.24404-2-boqun.feng@gmail.com>
Date: Sat, 17 Jan 2026 20:22:39 +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 1/5] rust: helpers: Generify the definitions of rust_helper_*_{read,set}*

To support atomic pointers, more {read,set} 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 | 53 +++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 30 deletions(-)

diff --git a/rust/helpers/atomic_ext.c b/rust/helpers/atomic_ext.c
index 7d0c2bd340da..f471c1ff123d 100644
--- a/rust/helpers/atomic_ext.c
+++ b/rust/helpers/atomic_ext.c
@@ -4,45 +4,38 @@
 #include <asm/rwonce.h>
 #include <linux/atomic.h>
 
-__rust_helper s8 rust_helper_atomic_i8_read(s8 *ptr)
-{
-	return READ_ONCE(*ptr);
-}
-
-__rust_helper s8 rust_helper_atomic_i8_read_acquire(s8 *ptr)
-{
-	return smp_load_acquire(ptr);
-}
-
-__rust_helper s16 rust_helper_atomic_i16_read(s16 *ptr)
-{
-	return READ_ONCE(*ptr);
+#define GEN_READ_HELPER(tname, type)						\
+__rust_helper type rust_helper_atomic_##tname##_read(type *ptr)			\
+{										\
+	return READ_ONCE(*ptr);							\
 }
 
-__rust_helper s16 rust_helper_atomic_i16_read_acquire(s16 *ptr)
-{
-	return smp_load_acquire(ptr);
+#define GEN_SET_HELPER(tname, type)						\
+__rust_helper void rust_helper_atomic_##tname##_set(type *ptr, type val)	\
+{										\
+	WRITE_ONCE(*ptr, val);							\
 }
 
-__rust_helper void rust_helper_atomic_i8_set(s8 *ptr, s8 val)
-{
-	WRITE_ONCE(*ptr, val);
+#define GEN_READ_ACQUIRE_HELPER(tname, type)					\
+__rust_helper type rust_helper_atomic_##tname##_read_acquire(type *ptr)		\
+{										\
+	return smp_load_acquire(ptr);						\
 }
 
-__rust_helper void rust_helper_atomic_i8_set_release(s8 *ptr, s8 val)
-{
-	smp_store_release(ptr, val);
+#define GEN_SET_RELEASE_HELPER(tname, type)					\
+__rust_helper void rust_helper_atomic_##tname##_set_release(type *ptr, type val)\
+{										\
+	smp_store_release(ptr, val);						\
 }
 
-__rust_helper void rust_helper_atomic_i16_set(s16 *ptr, s16 val)
-{
-	WRITE_ONCE(*ptr, val);
-}
+#define GEN_READ_SET_HELPERS(tname, type)					\
+	GEN_READ_HELPER(tname, type)						\
+	GEN_SET_HELPER(tname, type)						\
+	GEN_READ_ACQUIRE_HELPER(tname, type)					\
+	GEN_SET_RELEASE_HELPER(tname, type)					\
 
-__rust_helper void rust_helper_atomic_i16_set_release(s16 *ptr, s16 val)
-{
-	smp_store_release(ptr, val);
-}
+GEN_READ_SET_HELPERS(i8, s8)
+GEN_READ_SET_HELPERS(i16, s16)
 
 /*
  * xchg helpers depend on ARCH_SUPPORTS_ATOMIC_RMW and on the
-- 
2.51.0