[PATCH v4 0/3] rust: workqueue: add safe cancellation and status methods

[Aakash Bollineni via B4 Relay <devnull+aakash.bollineni.multicorewareinc.com@kernel.org>]

This is the fourth version of the patch series for modernizing the Linux
kernel Rust workqueue infrastructure.

Changes in v4:
- Fixed rustfmt and formatting errors in samples/rust/rust_workqueue_test.rs
  reported by the kernel test robot.
- Added Reported-by and Closes tags to the third patch for robot tracking.
- Improved the commit structure to cleanly separate API changes from tests.
- Link to v3: https://lore.kernel.org/r/20260403-workqueue-v3-final-v3-0-6ffc3950d804@multicorewareinc.com

Changes in v3:
- Fixed a critical initialization bug in the DelayedWork C-helper where
  the timer function was not correctly registered, causing KUnit crashes.
- Consolidated Arc refcount inspection into a shared `arc_count` helper
  in `rust/kernel/workqueue.rs` (gated by CONFIG_KUNIT).
- Updated internal KUnit tests and sample module to use the shared helper.
- Split the sample test's `TestItem` into `TestWorkItem` and
  `TestDelayedWorkItem` for clearer trait dispatch and safety.
- Integrated the sample stress test into the kernel build system via
  the SAMPLES_RUST Kconfig.
- Improved documentation and safety comments based on feedback from
  Onur and Miguel Ojeda.

Aakash Bollineni (3):
  rust: helpers: add workqueue helpers
  rust: workqueue: add safe cancellation and status methods
  rust: workqueue: add KUnit and sample stress tests

To: Miguel Ojeda <ojeda@kernel.org>
To: Alex Gaynor <alex.gaynor@gmail.com>
To: Wedson Almeida Filho <wedsonaf@gmail.com>
To: Boqun Feng <boqun.feng@gmail.com>
To: Gary Guo <gary@garyguo.net>
To: Björn Roy Baron <bjorn.roy.baron@gmail.com>
To: Benno Lossin <benno.lossin@proton.me>
To: Andreas Hindborg <a.hindborg@samsung.com>
To: Alice Ryhl <aliceryhl@google.com>
To: Tejun Heo <tj@kernel.org>
To: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: rust-for-linux@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

Signed-off-by: Aakash Bollineni <aakash.bollineni@multicorewareinc.com>
---
Aakash Bollineni (3):
      rust: helpers: add workqueue helpers
      rust: workqueue: add safe cancellation and status methods
      rust: workqueue: add KUnit and sample stress tests

 rust/helpers/workqueue.c            |  32 +++
 rust/kernel/workqueue.rs            | 463 +++++++++++++++++++++++++++++++++---
 samples/rust/Kconfig                |  10 +
 samples/rust/Makefile               |   2 +
 samples/rust/rust_workqueue_test.rs | 192 +++++++++++++++
 5 files changed, 664 insertions(+), 35 deletions(-)
---
base-commit: bf074eb6891be799174ff42e0051492681fdc045
change-id: 20260403-workqueue-v3-final-fa406defb67c

Best regards,
-- 
Aakash Bollineni <aakash.bollineni@multicorewareinc.com>