linux-kernel - [PATCH 0/4] Improvements for Devres

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Message-ID: <20250612145145.12143-1-dakr@kernel.org>
Date: Thu, 12 Jun 2025 16:51:37 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: gregkh@...uxfoundation.org,
	rafael@...nel.org,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 0/4] Improvements for Devres

This patch series provides some optimizations for Devres:

  1) Provide a more lightweight replacement for Devres::new_foreign_owned().

  2) Get rid of Devres' inner Arc and instead consume and provide an
     impl PinInit instead.

     Additionally, having the resulting explicit synchronization in
     Devres::drop() prevents potential subtle undesired side effects of the
     devres callback dropping the final Arc reference asynchronously within
     the devres callback.

  3) An optimization for when we never need to access the resource or release
     it manually.

Thanks to Alice for some great offline discussions on this topic.

This patch series depends on the devres fixes [1] the Opaque patch in [2] and
the pin-init patch in [3], which Benno will provide a signed tag for. A branch
containing the patches can be found in [4].

[1] https://lore.kernel.org/lkml/20250612121817.1621-1-dakr@kernel.org/
[2] https://lore.kernel.org/lkml/20250610-b4-rust_miscdevice_registrationdata-v6-1-b03f5dfce998@gmail.com/
[3] https://lore.kernel.org/rust-for-linux/20250529081027.297648-2-lossin@kernel.org/
[4] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/devres

Danilo Krummrich (4):
  rust: revocable: support fallible PinInit types
  rust: devres: replace Devres::new_foreign_owned()
  rust: devres: get rid of Devres' inner Arc
  rust: devres: implement register_foreign_release()

 drivers/gpu/nova-core/driver.rs |   7 +-
 drivers/gpu/nova-core/gpu.rs    |   6 +-
 rust/helpers/device.c           |   7 +
 rust/kernel/cpufreq.rs          |   8 +-
 rust/kernel/devres.rs           | 338 ++++++++++++++++++++++----------
 rust/kernel/drm/driver.rs       |  11 +-
 rust/kernel/pci.rs              |  20 +-
 rust/kernel/revocable.rs        |   7 +-
 samples/rust/rust_driver_pci.rs |  19 +-
 9 files changed, 280 insertions(+), 143 deletions(-)


base-commit: e15a5b4301ec42990448b5b023e3439315b821ce
-- 
2.49.0