linux-kernel - [PATCH v3 0/2] rust: improve `ForeignOwnable`

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Message-Id: <20250612-pointed-to-v3-0-b009006d86a1@kernel.org>
Date: Thu, 12 Jun 2025 15:09:42 +0200
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Danilo Krummrich <dakr@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
 Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
 Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Tamir Duberstein <tamird@...il.com>, Viresh Kumar <viresh.kumar@...aro.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pci@...r.kernel.org, Andreas Hindborg <a.hindborg@...nel.org>, 
 Maíra Canal <mcanal@...lia.com>
Subject: [PATCH v3 0/2] rust: improve `ForeignOwnable`

This series improves `ForeignOwnable` by:

 - changing the way we assert pointer allignment,
 - improving the safety requirements of the trait.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
Changes in v3:
- Remove more instances of absolute paths to `ffi` types.
- Reword safety requirements in terms of function guarantees.
- Add a patch to restrict use of null pointers with `ForeignOwnable`.
- Link to v2: https://lore.kernel.org/r/20250610-pointed-to-v2-1-fad8f92cf1e5@kernel.org

Changes in v2:
- Replace qualified path with `use` for `crate::ffi::c_void`.
- Fix a typo and rephrase docs for `ForeignOwnable`.
- Reorganize docs for `ForeignOwnable::into_foreign`.
- Link to v1: https://lore.kernel.org/r/20250605-pointed-to-v1-1-ee1e262912cc@kernel.org

---
Andreas Hindborg (2):
      rust: types: add FOREIGN_ALIGN to ForeignOwnable
      rust: types: require `ForeignOwnable::into_foreign` return non-null

 rust/kernel/alloc/kbox.rs | 41 +++++++++++++++++++++++------------------
 rust/kernel/miscdevice.rs | 10 +++++-----
 rust/kernel/pci.rs        |  2 +-
 rust/kernel/platform.rs   |  2 +-
 rust/kernel/sync/arc.rs   | 24 +++++++++++++-----------
 rust/kernel/types.rs      | 46 +++++++++++++++++++++++-----------------------
 rust/kernel/xarray.rs     |  9 +++++----
 7 files changed, 71 insertions(+), 63 deletions(-)
---
base-commit: ec7714e4947909190ffb3041a03311a975350fe0
change-id: 20250605-pointed-to-6170ae01520f

Best regards,
-- 
Andreas Hindborg <a.hindborg@...nel.org>