From d9ea5a41cef80dc8103f4114b072b27364f2e06a Mon Sep 17 00:00:00 2001 From: Boqun Feng Date: Thu, 4 Sep 2025 21:41:36 -0700 Subject: 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 Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Alice Ryhl Reviewed-by: Elle Rhumsaa Link: https://lore.kernel.org/all/20250719030827.61357-10-boqun.feng@gmail.com/ --- rust/kernel/sync.rs | 1 + 1 file changed, 1 insertion(+) (limited to 'rust/kernel/sync.rs') diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs index 7e962e5429d2..bf8943c88a89 100644 --- a/rust/kernel/sync.rs +++ b/rust/kernel/sync.rs @@ -12,6 +12,7 @@ use pin_init; mod arc; pub mod aref; pub mod atomic; +pub mod barrier; pub mod completion; mod condvar; pub mod lock; -- cgit v1.2.3