linux-kernel - [tip: locking/core] rust: list: Switch to kernel::sync atomic primitives

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Message-ID: <176830138984.510.12031634682208427016.tip-bot2@tip-bot2>
Date: Tue, 13 Jan 2026 10:49:49 -0000
From: "tip-bot2 for FUJITA Tomonori" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>,
 Alice Ryhl <aliceryhl@...gle.com>, Boqun Feng <boqun.feng@...il.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: locking/core] rust: list: Switch to kernel::sync atomic primitives

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     323e4bfcbe2dc6c6cac6e007dded0ba4f89a6458
Gitweb:        https://git.kernel.org/tip/323e4bfcbe2dc6c6cac6e007dded0ba4f89a6458
Author:        FUJITA Tomonori <fujita.tomonori@...il.com>
AuthorDate:    Tue, 30 Dec 2025 18:37:17 +09:00
Committer:     Boqun Feng <boqun.feng@...il.com>
CommitterDate: Fri, 09 Jan 2026 19:01:41 +08:00

rust: list: Switch to kernel::sync atomic primitives

Convert uses of `AtomicBool` to `Atomic<bool>`.

Note that the compare_exchange migration simplifies to
`try_cmpxchg()`, since `try_cmpxchg()` provides relaxed ordering on
failure, making the explicit failure ordering unnecessary.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Link: https://patch.msgid.link/20251230093718.1852322-3-fujita.tomonori@gmail.com
---
 rust/kernel/list/arc.rs | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/rust/kernel/list/arc.rs b/rust/kernel/list/arc.rs
index d92bcf6..2282f33 100644
--- a/rust/kernel/list/arc.rs
+++ b/rust/kernel/list/arc.rs
@@ -6,11 +6,11 @@
 
 use crate::alloc::{AllocError, Flags};
 use crate::prelude::*;
+use crate::sync::atomic::{ordering, Atomic};
 use crate::sync::{Arc, ArcBorrow, UniqueArc};
 use core::marker::PhantomPinned;
 use core::ops::Deref;
 use core::pin::Pin;
-use core::sync::atomic::{AtomicBool, Ordering};
 
 /// Declares that this type has some way to ensure that there is exactly one `ListArc` instance for
 /// this id.
@@ -469,7 +469,7 @@ where
 /// If the boolean is `false`, then there is no [`ListArc`] for this value.
 #[repr(transparent)]
 pub struct AtomicTracker<const ID: u64 = 0> {
-    inner: AtomicBool,
+    inner: Atomic<bool>,
     // This value needs to be pinned to justify the INVARIANT: comment in `AtomicTracker::new`.
     _pin: PhantomPinned,
 }
@@ -480,12 +480,12 @@ impl<const ID: u64> AtomicTracker<ID> {
         // INVARIANT: Pin-init initializers can't be used on an existing `Arc`, so this value will
         // not be constructed in an `Arc` that already has a `ListArc`.
         Self {
-            inner: AtomicBool::new(false),
+            inner: Atomic::new(false),
             _pin: PhantomPinned,
         }
     }
 
-    fn project_inner(self: Pin<&mut Self>) -> &mut AtomicBool {
+    fn project_inner(self: Pin<&mut Self>) -> &mut Atomic<bool> {
         // SAFETY: The `inner` field is not structurally pinned, so we may obtain a mutable
         // reference to it even if we only have a pinned reference to `self`.
         unsafe { &mut Pin::into_inner_unchecked(self).inner }
@@ -500,7 +500,7 @@ impl<const ID: u64> ListArcSafe<ID> for AtomicTracker<ID> {
 
     unsafe fn on_drop_list_arc(&self) {
         // INVARIANT: We just dropped a ListArc, so the boolean should be false.
-        self.inner.store(false, Ordering::Release);
+        self.inner.store(false, ordering::Release);
     }
 }
 
@@ -514,8 +514,6 @@ unsafe impl<const ID: u64> TryNewListArc<ID> for AtomicTracker<ID> {
     fn try_new_list_arc(&self) -> bool {
         // INVARIANT: If this method returns true, then the boolean used to be false, and is no
         // longer false, so it is okay for the caller to create a new [`ListArc`].
-        self.inner
-            .compare_exchange(false, true, Ordering::Acquire, Ordering::Relaxed)
-            .is_ok()
+        self.inner.cmpxchg(false, true, ordering::Acquire).is_ok()
     }
 }