diff options
| author | Boqun Feng <boqun.feng@gmail.com> | 2025-09-04 21:41:36 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-09-15 09:38:34 +0200 |
| commit | d9ea5a41cef80dc8103f4114b072b27364f2e06a (patch) | |
| tree | c00263765c7e37f63fd2a2015ac843fbac3ad5c3 /rust/helpers | |
| parent | 84c6d36bcaf98a8c0533cd334a624d536d20879b (diff) | |
rust: sync: Add memory barriers
Memory barriers are building blocks for concurrent code, hence provide
a minimal set of them.
The compiler barrier, barrier(), is implemented in inline asm instead of
using core::sync::atomic::compiler_fence() because memory models are
different: kernel's atomics are implemented in inline asm therefore the
compiler barrier should be implemented in inline asm as well. Also it's
currently only public to the kernel crate until there's a reasonable
driver usage.
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Elle Rhumsaa <elle@weathered-steel.dev>
Link: https://lore.kernel.org/all/20250719030827.61357-10-boqun.feng@gmail.com/
Diffstat (limited to 'rust/helpers')
| -rw-r--r-- | rust/helpers/barrier.c | 18 | ||||
| -rw-r--r-- | rust/helpers/helpers.c | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/rust/helpers/barrier.c b/rust/helpers/barrier.c new file mode 100644 index 000000000000..cdf28ce8e511 --- /dev/null +++ b/rust/helpers/barrier.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <asm/barrier.h> + +void rust_helper_smp_mb(void) +{ + smp_mb(); +} + +void rust_helper_smp_wmb(void) +{ + smp_wmb(); +} + +void rust_helper_smp_rmb(void) +{ + smp_rmb(); +} diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c index 7053f9245759..85ad14b81925 100644 --- a/rust/helpers/helpers.c +++ b/rust/helpers/helpers.c @@ -9,6 +9,7 @@ #include "atomic.c" #include "auxiliary.c" +#include "barrier.c" #include "blk.c" #include "bug.c" #include "build_assert.c" |