rcu/nocb: Rename wake_nocb_leader_defer() to wake_nocb_gp_defer()

This commit adjusts naming to account for the new distinction between
callback and grace-period no-CBs kthreads.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

kernel/rcu/tree_plugin.h

@@ -1563,7 +1563,7 @@ static void wake_nocb_gp(struct rcu_data *rdp, bool force)
  * Arrange to wake the GP kthread for this NOCB group at some future
  * time when it is safe to do so.
  */
-static void wake_nocb_leader_defer(struct rcu_data *rdp, int waketype,
+static void wake_nocb_gp_defer(struct rcu_data *rdp, int waketype,
 			       const char *reason)
 {
 	unsigned long flags;
@@ -1660,7 +1660,7 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
 			trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
 					    TPS("WakeEmpty"));
 		} else {
-			wake_nocb_leader_defer(rdp, RCU_NOCB_WAKE,
+			wake_nocb_gp_defer(rdp, RCU_NOCB_WAKE,
 					   TPS("WakeEmptyIsDeferred"));
 		}
 		rdp->qlen_last_fqs_check = 0;
@@ -1671,7 +1671,7 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
 			trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
 					    TPS("WakeOvf"));
 		} else {
-			wake_nocb_leader_defer(rdp, RCU_NOCB_WAKE_FORCE,
+			wake_nocb_gp_defer(rdp, RCU_NOCB_WAKE_FORCE,
 					   TPS("WakeOvfIsDeferred"));
 		}
 		rdp->qlen_last_fqs_check = LONG_MAX / 2;