Update /debug/tracing/README

[safe/jmp/linux-2.6] / kernel / rcupreempt.c

diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index f9dc8f3..5d59e85 100644 (file)
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -1177,7 +1177,19 @@ EXPORT_SYMBOL_GPL(call_rcu_sched);
  * in -rt this does -not- necessarily result in all currently executing
  * interrupt -handlers- having completed.
  */
-synchronize_rcu_xxx(__synchronize_sched, call_rcu_sched)
+void __synchronize_sched(void)
+{
+       struct rcu_synchronize rcu;
+
+       if (num_online_cpus() == 1)
+               return;  /* blocking is gp if only one CPU! */
+
+       init_completion(&rcu.completion);
+       /* Will wake me after RCU finished. */
+       call_rcu_sched(&rcu.head, wakeme_after_rcu);
+       /* Wait for it. */
+       wait_for_completion(&rcu.completion);
+}
 EXPORT_SYMBOL_GPL(__synchronize_sched);
 
 /*