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59cf3a5bda
Add a Rust abstraction for sleepable RCU (SRCU), backed by C srcu_struct. Provide FFI helpers and a safe wrapper with a guard-based API for read-side critical sections. Cleanup is handled via `PinnedDrop`. It first checks for active read-side sections and emits a warning if any guards were leaked. In that case, it waits in `synchronize_srcu()` rather than risking a UAF by freeing the `srcu_struct` that is still reachable from the C side. It then uses `srcu_barrier()` to drain pending callbacks before finally calling `cleanup_srcu_struct()`. Signed-off-by: Onur Özkan <work@onurozkan.dev> Reviewed-by: Gary Guo <gary@garyguo.net> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Boqun Feng <boqun@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>