synchronize_rcu() is a frequently used C function which is always safe to be called.
Add a safe abstraction for synchronize_rcu(). Signed-off-by: Philipp Stanner <[email protected]> Reviewed-by: Onur Özkan <[email protected]> Reviewed-by: Danilo Krummrich <[email protected]> Reviewed-by: Gary Guo <[email protected]> --- rust/kernel/sync/rcu.rs | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/rust/kernel/sync/rcu.rs b/rust/kernel/sync/rcu.rs index a32bef6e490b..2bae76d229f0 100644 --- a/rust/kernel/sync/rcu.rs +++ b/rust/kernel/sync/rcu.rs @@ -50,3 +50,19 @@ fn drop(&mut self) { pub fn read_lock() -> Guard { Guard::new() } + +/// Wait for one RCU grace period. +/// +/// Waits for all RCU read-side critical sections (such as those established by +/// a [`rcu::Guard`]) at the moment of the function call to finish. +/// +/// Does not prevent new read-side critical sections from starting, which may +/// begin and run while this call is blocking. +/// +/// Note that this is one of the RCU primitives which must not be called in +/// atomic context. +#[inline] +pub fn synchronize_rcu() { + // SAFETY: `synchronize_rcu()` is always safe to be called from process context. + unsafe { bindings::synchronize_rcu() }; +} -- 2.54.0
