[GIT PULL] Rust pin-init for v6.16

[Benno Lossin <lossin@kernel.org>]

Hi Miguel,

Here is the first pin-init pull request! It contains more changes than I
expected the first PR to have, but the new CI discovered a few smaller
issues and I also got a contribution.

All commits have been in linux-next for a few days. The earlier commits
have been in linux-next for a few weeks.

No conflicts expected.

Please pull for v6.16 -- thanks!

---
Cheers,
Benno

The following changes since commit 9c32cda43eb78f78c73aee4aa344b777714e259b:

  Linux 6.15-rc3 (2025-04-20 13:43:47 -0700)

are available in the Git repository at:

  https://github.com/Rust-for-Linux/linux.git tags/pin-init-v6.16

for you to fetch changes up to 9de1a293c8ece00d226b21a35751ec178be2a9fa:

  rust: pin-init: improve documentation for `Zeroable` derive macros (2025-05-01 18:16:22 +0200)

----------------------------------------------------------------
pin-init changes for v6.16

Added:

- 'Wrapper<T>' trait for creating pin-initializers for wrapper structs
  with a structurally pinned value such as 'UnsafeCell<T>' or
  'MaybeUninit<T>'.

- 'MaybeZeroable' derive macro to try to derive 'Zeroable', but not
  error if not all fields implement it. This is needed to derive
  'Zeroable' for all bindgen-generated structs.

- 'unsafe fn cast_[pin_]init()' functions to unsafely change the
  initialized type of an initializer. These are utilized by the
  'Wrapper<T>' implementations.

Changed:

- Added support for visibility in 'Zeroable' derive macro.

- Added support for 'union's in 'Zeroable' derive macro.

Upstream dev news:

- The CI has been streamlined & some bugs with it have been fixed. I
  also added new workflows to check if the user-space version and the
  one in the kernel tree have diverged.

- I also started to use the issues [1] tab to keep track of any problems
  or unexpected/unwanted things. This should help folks report and
  diagnose issues w.r.t. 'pin-init' better.

[1]: https://github.com/rust-for-linux/pin-init/issues

----------------------------------------------------------------
Benno Lossin (10):
      rust: pin-init: synchronize README.md
      rust: pin-init: internal: skip rustfmt formatting of kernel-only module
      rust: pin-init: examples: conditionally enable `feature(lint_reasons)`
      rust: pin-init: examples: use `allow` instead of `expect`
      rust: pin-init: add `cast_[pin_]init` functions to change the initialized type
      rust: pin-init: allow `pub` fields in `derive(Zeroable)`
      rust: pin-init: allow `Zeroable` derive macro to also be applied to unions
      rust: pin-init: add `MaybeZeroable` derive macro
      rust: pin-init: fix typos
      rust: pin-init: improve documentation for `Zeroable` derive macros

Christian Schrefl (4):
      rust: pin-init: Add the `Wrapper` trait.
      rust: pin-init: Implement `Wrapper` for `UnsafePinned` behind feature flag.
      rust: pin-init: Update Changelog and Readme
      rust: pin-init: Update the structural pinning link in readme.

 rust/pin-init/README.md                 |  14 +++-
 rust/pin-init/examples/linked_list.rs   |   1 +
 rust/pin-init/examples/mutex.rs         |   1 +
 rust/pin-init/examples/pthread_mutex.rs |   4 +-
 rust/pin-init/examples/static_init.rs   |   1 +
 rust/pin-init/internal/src/lib.rs       |   6 ++
 rust/pin-init/internal/src/zeroable.rs  |  27 +++++-
 rust/pin-init/src/lib.rs                | 144 +++++++++++++++++++++++++++++++-
 rust/pin-init/src/macros.rs             |  91 +++++++++++++++++++-
 9 files changed, 279 insertions(+), 10 deletions(-)