Re: [PATCH v1 0/4] rust: Add i8/i16 atomic try_cmpxchg helpers

[Boqun Feng <boqun.feng@gmail.com>]

On Sat, Dec 27, 2025 at 08:59:47PM +0900, FUJITA Tomonori wrote:
> This series adds Rust helpers for atomic try_cmpxchg on i8/i16 with
> full, acquire, release, and relaxed orderings in preparation for
> supporting Rust-side cmpxchg on those types.
> 
> Rust atomic cmpxchg is implemented on top of the kernel C APIs,
> try_cmpxchg.
> 
> On architectures that support Rust today, the kernel already provides
> try_cmpxchg implementations that work for i8/i16, using
> architecture-specific instructions.
> 
> Tested on QEMU (86_64, arm64, riscv, loongarch, and armv7).
> 
> Follow-up patches will add Rust users of these helpers.
> 
> Boqun, feel free to drop the ordering-related notes from each patch.
> 

Queued, thanks!

Regards,
Boqun

> FUJITA Tomonori (4):
>   rust: helpers: Add i8/i16 atomic try_cmpxchg helpers
>   rust: helpers: Add i8/i16 atomic try_cmpxchg_acquire helpers
>   rust: helpers: Add i8/i16 atomic try_cmpxchg_release helpers
>   rust: helpers: Add i8/i16 atomic try_cmpxchg_relaxed helpers
> 
>  rust/helpers/atomic_ext.c | 40 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> 
> base-commit: 30f5de001fb2ffacdb61e82c8626cae2d68b4d03
> -- 
> 2.43.0
>