[PATCH RFC 0/2] rcu box container for Rust + maple tree load_rcu

[Alice Ryhl <aliceryhl@google.com>]

I'm sending this RFC to share an experiment I'm looking at. This may let
us replace the range allocator in Rust Binder with a maple tree.

An RcuBox is like a Box except that it lets you obtain a &T that
outlives the box by a grace period. It does not allow mutable access to
the inner value (Binder would probably use LockedBy for inner values).

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
Alice Ryhl (2):
      rust: rcu: add RcuBox type
      rust: maple_tree: add load_rcu()

 rust/bindings/bindings_helper.h |   1 +
 rust/kernel/maple_tree.rs       |  52 ++++++++++++++
 rust/kernel/sync/rcu.rs         |  31 ++++++++-
 rust/kernel/sync/rcu/rcu_box.rs | 145 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 228 insertions(+), 1 deletion(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20260116-rcu-box-7a8e4c9f2180

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>