rcu: Get rcu_sched_force_quiescent_state() where it belongs

The very similar functions rcu_force_quiescent_state(),
rcu_bh_force_quiescent_state(), and rcu_sched_force_quiescent_state()
are supposed to be together, but have drifted apart.  This commit
restores rcu_sched_force_quiescent_state() to its rightful place.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

kernel/rcu/tree.c

@@ -409,6 +409,15 @@ void rcu_bh_force_quiescent_state(void)
 }
 EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);
 
+/*
+ * Force a quiescent state for RCU-sched.
+ */
+void rcu_sched_force_quiescent_state(void)
+{
+	force_quiescent_state(&rcu_sched_state);
+}
+EXPORT_SYMBOL_GPL(rcu_sched_force_quiescent_state);
+
 /*
  * Show the state of the grace-period kthreads.
  */
@@ -482,15 +491,6 @@ void rcutorture_record_progress(unsigned long vernum)
 }
 EXPORT_SYMBOL_GPL(rcutorture_record_progress);
 
-/*
- * Force a quiescent state for RCU-sched.
- */
-void rcu_sched_force_quiescent_state(void)
-{
-	force_quiescent_state(&rcu_sched_state);
-}
-EXPORT_SYMBOL_GPL(rcu_sched_force_quiescent_state);
-
 /*
  * Does the CPU have callbacks ready to be invoked?
  */