From 821fe7bf16c57d690f4f92997f4e51abb93e0347 Mon Sep 17 00:00:00 2001
From: Andreas Hindborg <a.hindborg@kernel.org>
Date: Wed, 24 Sep 2025 14:39:24 +0200
Subject: rust: sync: add `SetOnce`

Introduce the `SetOnce` type, a container that can only be written once.
The container uses an internal atomic to synchronize writes to the internal
value.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
Tested-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Daniel Gomez <da.gomez@kernel.org>
---
 rust/kernel/sync.rs | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'rust/kernel/sync.rs')

diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index cf5b638a097d..3f957ad3a9f0 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -20,6 +20,7 @@ mod locked_by;
 pub mod poll;
 pub mod rcu;
 mod refcount;
+mod set_once;
 
 pub use arc::{Arc, ArcBorrow, UniqueArc};
 pub use completion::Completion;
@@ -29,6 +30,7 @@ pub use lock::mutex::{new_mutex, Mutex, MutexGuard};
 pub use lock::spinlock::{new_spinlock, SpinLock, SpinLockGuard};
 pub use locked_by::LockedBy;
 pub use refcount::Refcount;
+pub use set_once::SetOnce;
 
 /// Represents a lockdep class. It's a wrapper around C's `lock_class_key`.
 #[repr(transparent)]
-- 
cgit