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[103.168.172.201]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-890772674fdsm129405266d6.47.2026.01.11.04.03.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jan 2026 04:03:11 -0800 (PST) Received: from phl-compute-06.internal (phl-compute-06.internal [10.202.2.46]) by mailfauth.phl.internal (Postfix) with ESMTP id E3847F40068; Sun, 11 Jan 2026 07:03:10 -0500 (EST) Received: from phl-frontend-03 ([10.202.2.162]) by phl-compute-06.internal (MEProxy); Sun, 11 Jan 2026 07:03:10 -0500 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgdduudeghedvucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepuehoqhhunhcu hfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrdgtohhmqeenucggtffrrghtth gvrhhnpeffheffudfgffehkedtveettddvleevgffgfeefveejleelffduteffhfduleeg ffenucffohhmrghinhepmhhsghhiugdrlhhinhhkpdhinhhnvghrrdhsthhorhgvpdhinh hnvghrqddrtghomhhprghrvgenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhep mhgrihhlfhhrohhmpegsohhquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhith ihqdeiledvgeehtdeigedqudejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgr ihhlrdgtohhmsehfihigmhgvrdhnrghmvgdpnhgspghrtghpthhtohepudehpdhmohguvg epshhmthhpohhuthdprhgtphhtthhopehpvghtvghriiesihhnfhhrrgguvggrugdrohhr ghdprhgtphhtthhopehmihhnghhosehkvghrnhgvlhdrohhrghdprhgtphhtthhopehruh hsthdqfhhorhdqlhhinhhugiesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthho pehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtth hopeifihhllheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepmhgrrhhkrdhruhhtlhgr nhgusegrrhhmrdgtohhmpdhrtghpthhtohepthhglhigsehlihhnuhhtrhhonhhigidrug gvpdhrtghpthhtohepohhjvggurgeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepghgr rhihsehgrghrhihguhhordhnvght X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Sun, 11 Jan 2026 07:03:10 -0500 (EST) From: Boqun Feng To: "Peter Zijlstra" , "Ingo Molnar" Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, "Will Deacon" , "Mark Rutland" , "Thomas Gleixner" , "Miguel Ojeda" , "Gary Guo" , "Alice Ryhl" , "Andreas Hindborg" , "Benno Lossin" , "Danilo Krummrich" , FUJITA Tomonori , Boqun Feng Subject: [PATCH 22/36] rust: list: Switch to kernel::sync atomic primitives Date: Sun, 11 Jan 2026 20:01:55 +0800 Message-ID: <20260111120209.6133-20-boqun.feng@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260111120209.6133-1-boqun.feng@gmail.com> References: <20260111115808.5702-1-boqun.feng@gmail.com> <20260111120209.6133-1-boqun.feng@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: FUJITA Tomonori Convert uses of `AtomicBool` to `Atomic`. 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 Reviewed-by: Alice Ryhl Signed-off-by: Boqun Feng 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 d92bcf665c89..2282f33913ee 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 @@ impl core::ops::DispatchFromDyn> for ListArc /// If the boolean is `false`, then there is no [`ListArc`] for this value. #[repr(transparent)] pub struct AtomicTracker { - inner: AtomicBool, + inner: Atomic, // This value needs to be pinned to justify the INVARIANT: comment in `AtomicTracker::new`. _pin: PhantomPinned, } @@ -480,12 +480,12 @@ pub fn new() -> impl PinInit { // 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 { // 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 @@ unsafe fn on_create_list_arc_from_unique(self: Pin<&mut Self>) { 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 TryNewListArc for AtomicTracker { 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() } } -- 2.51.0