diff options
| author | FUJITA Tomonori <fujita.tomonori@gmail.com> | 2025-12-27 20:59:48 +0900 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2026-01-09 19:01:41 +0800 |
| commit | 164e4b5600b32b4ddeac58bb5b37bc1490a1dce4 (patch) | |
| tree | c5dd77bec8ecc0e3153fb368a540df59312583c9 | |
| parent | 910cbddc416cc30d83966baf378f44e59f3dc5d7 (diff) | |
rust: helpers: Add i8/i16 atomic try_cmpxchg helpers
Add i8/i16 atomic try_cmpxchg helpers that call try_cmpxchg() macro
implementing atomic try_cmpxchg using architecture-specific
instructions.
[boqun: Add comments explaining CONFIG_ARCH_SUPPORTS_ATOMIC_RMW and use
try_cmpxchg() instead of raw_try_cmpxchg()]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251227115951.1424458-2-fujita.tomonori@gmail.com
| -rw-r--r-- | rust/helpers/atomic_ext.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/rust/helpers/atomic_ext.c b/rust/helpers/atomic_ext.c index 76e392c39c7b..5ee127f1cc80 100644 --- a/rust/helpers/atomic_ext.c +++ b/rust/helpers/atomic_ext.c @@ -90,3 +90,20 @@ __rust_helper s16 rust_helper_atomic_i16_xchg_relaxed(s16 *ptr, s16 new) { return xchg_relaxed(ptr, new); } + +/* + * try_cmpxchg helpers depend on ARCH_SUPPORTS_ATOMIC_RMW and on the + * architecture provding try_cmpxchg() support for i8 and i16. + * + * 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); +} |