tracing: Replace synchronize_sched() and call_rcu_sched()

Now that synchronize_rcu() waits for preempt-disable regions of code
as well as RCU read-side critical sections, synchronize_sched() can
be replaced by synchronize_rcu().  Similarly, call_rcu_sched() can be
replaced by call_rcu().  This commit therefore makes these changes.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: <linux-kernel@vger.kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index a3be423..46f2ab1 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -92,7 +92,7 @@
 	while (early_probes) {
 		tmp = early_probes;
 		early_probes = tmp->next;
-		call_rcu_sched(tmp, rcu_free_old_probes);
+		call_rcu(tmp, rcu_free_old_probes);
 	}
 
 	return 0;
@@ -123,7 +123,7 @@
 		 * cover both cases. So let us chain the SRCU and sched RCU
 		 * callbacks to wait for both grace periods.
 		 */
-		call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes);
+		call_rcu(&tp_probes->rcu, rcu_free_old_probes);
 	}
 }