1 files changed, 14 insertions, 0 deletions

diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c
index be922c9f3d37..50d1861f7759 100644
--- a/kernel/rcu/sync.c
+++ b/kernel/rcu/sync.c
@@ -68,6 +68,8 @@ void rcu_sync_lockdep_assert(struct rcu_sync *rsp)
         RCU_LOCKDEP_WARN(!gp_ops[rsp->gp_type].held(),
                          "suspicious rcu_sync_is_idle() usage");
 }
+
+EXPORT_SYMBOL_GPL(rcu_sync_lockdep_assert);
 #endif
 
 /**
@@ -83,6 +85,18 @@ void rcu_sync_init(struct rcu_sync *rsp, enum rcu_sync_type type)
 }
 
 /**
+ * Must be called after rcu_sync_init() and before first use.
+ *
+ * Ensures rcu_sync_is_idle() returns false and rcu_sync_{enter,exit}()
+ * pairs turn into NO-OPs.
+ */
+void rcu_sync_enter_start(struct rcu_sync *rsp)
+{
+        rsp->gp_count++;
+        rsp->gp_state = GP_PASSED;
+}
+
+/**
  * rcu_sync_enter() - Force readers onto slowpath
  * @rsp: Pointer to rcu_sync structure to use for synchronization
  *