[Linaro-mm-sig] [PATCH v4 3/5] rust: sync: Add abstraction for rcu_barrier()

rcu_barrier() is a frequently used C function which is always safe to be called.

Add a safe abstraction for rcu_barrier().

Signed-off-by: Philipp Stanner phasta@kernel.org --- rust/kernel/sync/rcu.rs | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/rust/kernel/sync/rcu.rs b/rust/kernel/sync/rcu.rs index a32bef6e490b..9196feb62d6d 100644 --- a/rust/kernel/sync/rcu.rs +++ b/rust/kernel/sync/rcu.rs @@ -50,3 +50,9 @@ fn drop(&mut self) { pub fn read_lock() -> Guard { Guard::new() } + +/// Wait for all pending [`bindings::call_rcu()`] callbacks, if there are any. +pub fn rcu_barrier() { + // SAFETY: `rcu_barrier()` is always safe to be called. It just might wait for a grace period. + unsafe { bindings::rcu_barrier() }; +}