[tip: locking/core] rust: helpers: Add i8/i16 atomic xchg_acquire helpers

[tip-bot2 for FUJITA Tomonori]

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

Commit-ID:     ab717dd98bee964add2161d94193d756fdef614c
Gitweb:        https://git.kernel.org/tip/ab717dd98bee964add2161d94193d756fdef614c
Author:        FUJITA Tomonori <fujita.tomonori@xxxxxxxxx>
AuthorDate:    Tue, 23 Dec 2025 15:21:38 +09:00
Committer:     Boqun Feng <boqun.feng@xxxxxxxxx>
CommitterDate: Fri, 09 Jan 2026 19:01:40 +08:00

rust: helpers: Add i8/i16 atomic xchg_acquire helpers

Add i8/i16 atomic xchg_acquire helpers that call xchg_acquire() macro
implementing atomic xchg_acquire using architecture-specific
instructions.

[boqun: Use xchg_acquire() instead of raw_xchg_acquire()]

Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxx>
Reviewed-by: Gary Guo <gary@xxxxxxxxxxx>
Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
Link: https://patch.msgid.link/20251223062140.938325-3-fujita.tomonori@xxxxxxxxx
---
 rust/helpers/atomic_ext.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/rust/helpers/atomic_ext.c b/rust/helpers/atomic_ext.c
index 3136255..177bb36 100644
--- a/rust/helpers/atomic_ext.c
+++ b/rust/helpers/atomic_ext.c
@@ -60,3 +60,13 @@ __rust_helper s16 rust_helper_atomic_i16_xchg(s16 *ptr, s16 new)
 {
 	return xchg(ptr, new);
 }
+
+__rust_helper s8 rust_helper_atomic_i8_xchg_acquire(s8 *ptr, s8 new)
+{
+	return xchg_acquire(ptr, new);
+}
+
+__rust_helper s16 rust_helper_atomic_i16_xchg_acquire(s16 *ptr, s16 new)
+{
+	return xchg_acquire(ptr, new);
+}