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

[Andreas Hindborg <a.hindborg@kernel.org>]

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@kernel.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@kernel.org>