From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D5BDE424D42; Tue, 4 Aug 2026 19:53:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785873190; cv=none; b=UbxQWcwUNGaHRZW7TBxHRpW2vVStZ1QZMu/u3K87oQyBv3eqbZFTnvfDFYKcIhvEvUlS5l2M4/3fA8nIEEpNgnOZtFQhx1FbSVpbimr7FliDdIkQTWdvZ0ZpLeDovegNsCeMQ8cVzx4rmbD7yubC6X8MAshtHnukJ2mMf91rctk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785873190; c=relaxed/simple; bh=iLHYNED7hpocr3rK4KZWzqlnjr+JhuR6jZpk3IFBYCE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VFtQXZbGFxBWaa7lXaoS+B5rZ63EmhKQKHJH/0fInACl958iHO/OEHLCPm0MxF7HJiljpnVIYoFVMPdPughhIeh097rB5De1dyvtCK2DOiwUoRc2ejpFzakO6jA/+sC/u7jGe6Gz6uejnowzf9vdtcgszygWk5DZ2Qb0+tc2mus= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VbLbf7lH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VbLbf7lH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 032901F00A3A; Tue, 4 Aug 2026 19:53:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785873188; bh=9joalpYDCOWt13zzWFXBUxnlYj5xrsu+mC8SOAnohlQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VbLbf7lHKej/s85zCFTkMNBF2y3mX+IRyTDJG4UhPajpXSMBZ1y2sQgRyYNqquuJh 5sHZMlwIghfKfUV0y0XoPPZjL5S+LQilaVECTKhetP0qcJJOvUqSBG/Up0L6q9N8oD 9JPT0TkDnkLgic88xHf/PVPy3SQnGPhQvhenQTLeR4Oa8pF0cynumn8qRzyOqcLdmh zCv7UONmTaJiKwIFXF0iIWrnSJOyBPUe97UQchLqfbTV0MJJe0rbgYezEATaAOaVrm vW1s6msLDtqYGeBjc+4xlf+4OBJIWTXPTVOaBDsVefZBDnwdnXYn9oT4sh7ZEkplQp fjNhdQTTnS+9g== From: Danilo Krummrich To: tj@kernel.org, jiangshanlai@gmail.com, aliceryhl@google.com, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, daniel.almeida@collabora.com, tamird@kernel.org, acourbot@nvidia.com, work@onurozkan.dev, jhubbard@nvidia.com Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, Danilo Krummrich Subject: [PATCH 1/7] rust: workqueue: replace deprecated system_wq with system_{percpu,dfl}_wq Date: Tue, 4 Aug 2026 21:52:03 +0200 Message-ID: <20260804195248.665636-2-dakr@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260804195248.665636-1-dakr@kernel.org> References: <20260804195248.665636-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit system_wq is deprecated and triggers a runtime warning: [ 0.857414] workqueue: work func ...WorkItemPointerKy0_E3runB7_ enqueued on deprecated workqueue. Use system_{percpu|dfl}_wq instead. Replace system() with system_percpu() and system_dfl(), to match the previous behavior of the deprecated system() and convert doc examples and tests to system_dfl(). Signed-off-by: Danilo Krummrich --- drivers/android/binder/process.rs | 4 ++-- rust/kernel/sync/completion.rs | 2 +- rust/kernel/workqueue.rs | 40 +++++++++++++++++++------------ 3 files changed, 28 insertions(+), 18 deletions(-) diff --git a/drivers/android/binder/process.rs b/drivers/android/binder/process.rs index 96b8440ceac6..c0266fdaa598 100644 --- a/drivers/android/binder/process.rs +++ b/drivers/android/binder/process.rs @@ -1632,7 +1632,7 @@ pub(crate) fn release(this: Arc, _file: &File) { if should_schedule { // Ignore failures to schedule to the workqueue. Those just mean that we're already // scheduled for execution. - let _ = workqueue::system().enqueue(this); + let _ = workqueue::system_percpu().enqueue(this); } drop(binderfs_file); @@ -1649,7 +1649,7 @@ pub(crate) fn flush(this: ArcBorrow<'_, Process>) -> Result { if should_schedule { // Ignore failures to schedule to the workqueue. Those just mean that we're already // scheduled for execution. - let _ = workqueue::system().enqueue(Arc::from(this)); + let _ = workqueue::system_percpu().enqueue(Arc::from(this)); } Ok(()) } diff --git a/rust/kernel/sync/completion.rs b/rust/kernel/sync/completion.rs index 35ff049ff078..1771bfc0ade2 100644 --- a/rust/kernel/sync/completion.rs +++ b/rust/kernel/sync/completion.rs @@ -38,7 +38,7 @@ /// done <- Completion::new(), /// }), GFP_KERNEL)?; /// -/// let _ = workqueue::system().enqueue(this.clone()); +/// let _ = workqueue::system_dfl().enqueue(this.clone()); /// /// Ok(this) /// } diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs index 7e253b6f299c..3194b9c441aa 100644 --- a/rust/kernel/workqueue.rs +++ b/rust/kernel/workqueue.rs @@ -67,7 +67,7 @@ //! /// This method will enqueue the struct for execution on the system workqueue, where its value //! /// will be printed. //! fn print_later(val: Arc) { -//! let _ = workqueue::system().enqueue(val); +//! let _ = workqueue::system_dfl().enqueue(val); //! } //! # print_later(MyStruct::new(42).unwrap()); //! ``` @@ -121,11 +121,11 @@ //! } //! //! fn print_1_later(val: Arc) { -//! let _ = workqueue::system().enqueue::, 1>(val); +//! let _ = workqueue::system_dfl().enqueue::, 1>(val); //! } //! //! fn print_2_later(val: Arc) { -//! let _ = workqueue::system().enqueue::, 2>(val); +//! let _ = workqueue::system_dfl().enqueue::, 2>(val); //! } //! # print_1_later(MyStruct::new(24, 25).unwrap()); //! # print_2_later(MyStruct::new(41, 42).unwrap()); @@ -171,13 +171,13 @@ //! /// This method will enqueue the struct for execution on the system workqueue, where its value //! /// will be printed 12 jiffies later. //! fn print_later(val: Arc) { -//! let _ = workqueue::system().enqueue_delayed(val, 12); +//! let _ = workqueue::system_dfl().enqueue_delayed(val, 12); //! } //! //! /// It is also possible to use the ordinary `enqueue` method together with `DelayedWork`. This //! /// is equivalent to calling `enqueue_delayed` with a delay of zero. //! fn print_now(val: Arc) { -//! let _ = workqueue::system().enqueue(val); +//! let _ = workqueue::system_dfl().enqueue(val); //! } //! # print_later(MyStruct::new(42).unwrap()); //! # print_now(MyStruct::new(42).unwrap()); @@ -1024,20 +1024,30 @@ unsafe impl RawDelayedWorkItem for ARef { } -/// Returns the system work queue (`system_wq`). +/// Returns the system per-cpu work queue (`system_percpu_wq`). /// /// It is the one used by `schedule[_delayed]_work[_on]()`. Multi-CPU multi-threaded. There are /// users which expect relatively short queue flush time. /// /// Callers shouldn't queue work items which can run for too long. -pub fn system() -> &'static Queue { - // SAFETY: `system_wq` is a C global, always available. - unsafe { Queue::from_raw(bindings::system_wq) } +pub fn system_percpu() -> &'static Queue { + // SAFETY: `system_percpu_wq` is a C global, always available. + unsafe { Queue::from_raw(bindings::system_percpu_wq) } +} + +/// Returns the system default (unbound) work queue (`system_dfl_wq`). +/// +/// Workers are not bound to any specific CPU, not concurrency managed, and all queued work items +/// are executed immediately as long as `max_active` limit is not reached and resources are +/// available. +pub fn system_dfl() -> &'static Queue { + // SAFETY: `system_dfl_wq` is a C global, always available. + unsafe { Queue::from_raw(bindings::system_dfl_wq) } } /// Returns the system high-priority work queue (`system_highpri_wq`). /// -/// It is similar to the one returned by [`system`] but for work items which require higher +/// It is similar to the one returned by [`system_percpu`] but for work items which require higher /// scheduling priority. pub fn system_highpri() -> &'static Queue { // SAFETY: `system_highpri_wq` is a C global, always available. @@ -1046,8 +1056,8 @@ pub fn system_highpri() -> &'static Queue { /// Returns the system work queue for potentially long-running work items (`system_long_wq`). /// -/// It is similar to the one returned by [`system`] but may host long running work items. Queue -/// flushing might take relatively long. +/// It is similar to the one returned by [`system_percpu`] but may host long running work items. +/// Queue flushing might take relatively long. pub fn system_long() -> &'static Queue { // SAFETY: `system_long_wq` is a C global, always available. unsafe { Queue::from_raw(bindings::system_long_wq) } @@ -1065,7 +1075,7 @@ pub fn system_unbound() -> &'static Queue { /// Returns the system freezable work queue (`system_freezable_wq`). /// -/// It is equivalent to the one returned by [`system`] except that it's freezable. +/// It is equivalent to the one returned by [`system_percpu`] except that it's freezable. /// /// A freezable workqueue participates in the freeze phase of the system suspend operations. Work /// items on the workqueue are drained and no new work item starts execution until thawed. @@ -1078,7 +1088,7 @@ pub fn system_freezable() -> &'static Queue { /// /// It is inclined towards saving power and is converted to "unbound" variants if the /// `workqueue.power_efficient` kernel parameter is specified; otherwise, it is similar to the one -/// returned by [`system`]. +/// returned by [`system_percpu`]. pub fn system_power_efficient() -> &'static Queue { // SAFETY: `system_power_efficient_wq` is a C global, always available. unsafe { Queue::from_raw(bindings::system_power_efficient_wq) } @@ -1097,7 +1107,7 @@ pub fn system_freezable_power_efficient() -> &'static Queue { /// Returns the system bottom halves work queue (`system_bh_wq`). /// -/// It is similar to the one returned by [`system`] but for work items which +/// It is similar to the one returned by [`system_percpu`] but for work items which /// need to run from a softirq context. pub fn system_bh() -> &'static Queue { // SAFETY: `system_bh_wq` is a C global, always available. -- 2.55.0