linux.git/rust/kernel/sync/srcu.rs, branch master Linux kernel source tree rust: sync: add SRCU abstraction 2026-07-15T22:34:26+00:00 Onur Özkan work@onurozkan.dev 2026-06-13T06:40:10+00:00 59cf3a5bda61cd3c300f0db952afcb031806e802 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> 
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>