diff options
| author | Gary Guo <gary@garyguo.net> | 2026-06-09 16:38:38 +0100 |
|---|---|---|
| committer | Boqun Feng <boqun@kernel.org> | 2026-08-04 05:52:54 -0700 |
| commit | 72856afd33f2fa166c06f1536003e300e51ecf09 (patch) | |
| tree | 4a2a0cfae6ece25f52086e825f4f0ee5e72a3b38 /rust/kernel/sync/atomic | |
| parent | 79d3d667af401eaa452f046595209aae6933c485 (diff) | |
rust: sync: Add generic memory barriers
Implement a generic interface for memory barriers (full system/DMA/SMP).
The interface uses a parameter to force user to specify their intent
with barriers.
Provide `Read`, `Write`, `Full` orderings which map to the existing
`rmb()`, `wmb()` and `mb()`. Generic is used here instead of providing
individual standalone functions to reduce code duplication; for example,
the `CONFIG_SMP` check in `smp_mb` is uniformly implemented for all SMP
barriers. This could extend to `virt_mb`'s if they're introduced in the
future. It would also make it easier if new ordering types are
introduced in the future (e.g. `Acquire`, `Release`).
Signed-off-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun@kernel.org>
Link: https://patch.msgid.link/20260609-rust-barrier-v2-2-30fcc48e1cd0@garyguo.net
Diffstat (limited to 'rust/kernel/sync/atomic')
| -rw-r--r-- | rust/kernel/sync/atomic/ordering.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/rust/kernel/sync/atomic/ordering.rs b/rust/kernel/sync/atomic/ordering.rs index 3f103aa8db99..c4e732e7212f 100644 --- a/rust/kernel/sync/atomic/ordering.rs +++ b/rust/kernel/sync/atomic/ordering.rs @@ -15,7 +15,7 @@ //! - It provides ordering between the annotated operation and all the following memory accesses. //! - It provides ordering between all the preceding memory accesses and all the following memory //! accesses. -//! - All the orderings are the same strength as a full memory barrier (i.e. `smp_mb()`). +//! - All the orderings are the same strength as a full memory barrier (i.e. `smp_mb(Full)`). //! - [`Relaxed`] provides no ordering except the dependency orderings. Dependency orderings are //! described in "DEPENDENCY RELATIONS" in [`LKMM`]'s [`explanation`]. //! |