linux-rng/rust/kernel/sync/srcu.rs, branch masterDevelopment tree for the kernel CSPRNGhttps://git.zx2c4.com/linux-rng/atom/rust/kernel/sync/srcu.rs?h=master2026-07-15T22:34:26Zrust: sync: add SRCU abstraction2026-07-15T22:34:26ZOnur Özkanwork@onurozkan.dev2026-06-13T06:40:10Zurn:sha1:59cf3a5bda61cd3c300f0db952afcb031806e802
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>