[PATCH 0/3] rust: sync: Introduce Rcu*Box

[Boqun Feng <boqun@kernel.org>]

(this series is based on Alice's RFC [1] and discussion around Philipp's
patches [2], [3])

As an easy way to provide RCU-protected allocation, two major types are
provided:

- `RcuBox<T, A>`, inner T will be dropped and after a grace period.
  Users: binder with maple_tree and dma_fence.
- `RcuFreeBox<T, A>`, inner T will be cleaned up immmediately and freed
  after a grace period. (Name suggestion is welcome). This is an attempt
  to consolidate Alice's `PollCondVarBox` [4] into a generic
  implementation, InPlaceInit support is still missing, but I want to
  get some feedback on the trait `RcuFreeSafe`.


[1]: https://lore.kernel.org/rust-for-linux/20260116-rcu-box-v1-0-38ebfbcd53f0@google.com/
[2]: https://lore.kernel.org/rust-for-linux/20260530143541.229628-2-phasta@kernel.org/
[3]: https://lore.kernel.org/rust-for-linux/20260520131725.266014-2-phasta@kernel.org/
[4]: https://lore.kernel.org/rust-for-linux/20260523-upgrade-poll-v4-0-f5b4c747eac2@google.com/

Regards,
Boqun

Alice Ryhl (2):
  rust: rcu: Add RcuBox type
  rust: maple_tree: Add load_rcu()

Boqun Feng (1):
  rust: rcu: Introduce RcuFreeBox

 rust/bindings/bindings_helper.h |   1 +
 rust/kernel/maple_tree.rs       |  52 ++++++
 rust/kernel/sync/rcu.rs         |  65 ++++++-
 rust/kernel/sync/rcu/rcu_box.rs | 290 ++++++++++++++++++++++++++++++++
 4 files changed, 407 insertions(+), 1 deletion(-)
 create mode 100644 rust/kernel/sync/rcu/rcu_box.rs

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2.51.0