diff options
| author | FUJITA Tomonori <fujita.tomonori@gmail.com> | 2025-12-23 15:21:37 +0900 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2026-01-09 19:01:40 +0800 |
| commit | 5dbc0a692459bc49cdb7add281086291da547750 (patch) | |
| tree | 62992364d86172d7fe8f873ba915b200a0ec529d /rust | |
| parent | 300e53b3d3b59e72a972a12ee5c6438aab4860a4 (diff) | |
rust: helpers: Add i8/i16 atomic xchg helpers
Add i8/i16 atomic xchg helpers that call xchg() macro implementing
atomic xchg using architecture-specific instructions.
[boqun: Use xchg() instead of raw_xchg()]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251223062140.938325-2-fujita.tomonori@gmail.com
Diffstat (limited to 'rust')
| -rw-r--r-- | rust/helpers/atomic_ext.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/rust/helpers/atomic_ext.c b/rust/helpers/atomic_ext.c index 02e05b4246ae..3136255a84c6 100644 --- a/rust/helpers/atomic_ext.c +++ b/rust/helpers/atomic_ext.c @@ -2,6 +2,7 @@ #include <asm/barrier.h> #include <asm/rwonce.h> +#include <linux/atomic.h> __rust_helper s8 rust_helper_atomic_i8_read(s8 *ptr) { @@ -42,3 +43,20 @@ __rust_helper void rust_helper_atomic_i16_set_release(s16 *ptr, s16 val) { smp_store_release(ptr, val); } + +/* + * xchg helpers depend on ARCH_SUPPORTS_ATOMIC_RMW and on the + * architecture provding xchg() support for i8 and i16. + * + * The architectures that currently support Rust (x86_64, armv7, + * arm64, riscv, and loongarch) satisfy these requirements. + */ +__rust_helper s8 rust_helper_atomic_i8_xchg(s8 *ptr, s8 new) +{ + return xchg(ptr, new); +} + +__rust_helper s16 rust_helper_atomic_i16_xchg(s16 *ptr, s16 new) +{ + return xchg(ptr, new); +} |