diff options
Diffstat (limited to 'rust')
| -rw-r--r-- | rust/kernel/sync/rcu.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/rust/kernel/sync/rcu.rs b/rust/kernel/sync/rcu.rs index a32bef6e490b..42d1b26a2143 100644 --- a/rust/kernel/sync/rcu.rs +++ b/rust/kernel/sync/rcu.rs @@ -50,3 +50,23 @@ impl Drop for Guard { pub fn read_lock() -> Guard { Guard::new() } + +/// Wait until all in-flight `call_rcu()` callbacks complete. +/// +/// Note that this primitive does not necessarily wait for an RCU grace period +/// to complete. For example, if there are no RCU callbacks queued anywhere +/// in the system, then [`rcu_barrier()`] is within its rights to return +/// immediately, without waiting for anything, much less an RCU grace period. +/// In fact, [`rcu_barrier()`] will normally not result in any RCU grace periods +/// beyond those that were already destined to be executed. +/// +/// In kernels built with `CONFIG_RCU_LAZY=y`, this function also hurries all +/// pending lazy RCU callbacks. +/// +/// Note that this is one of the RCU primitives which must not be called in +/// atomic context. +#[inline] +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() }; +} |