[tip: locking/core] rust: helpers: Generify the definitions of rust_helper_*_cmpxchg*

[tip-bot2 for Boqun Feng]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     a92236bf239cc01fd40d9cbe98fc8b9924c42a82
Gitweb:        https://git.kernel.org/tip/a92236bf239cc01fd40d9cbe98fc8b9924c42a82
Author:        Boqun Feng <boqun.feng@xxxxxxxxx>
AuthorDate:    Tue, 03 Mar 2026 12:16:53 -08:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Sun, 08 Mar 2026 11:06:48 +01:00

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@xxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260117122243.24404-4-boqun.feng@xxxxxxxxx
Link: https://patch.msgid.link/20260303201701.12204-6-boqun@xxxxxxxxxx
---
 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 c5f665b..240218e 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)