On Tue, Jul 28, 2015 at 04:39:25PM +0200, Petr Mladek wrote:
...

-static int __noreturn rcu_gp_kthread(void *arg)
+static void rcu_gp_kthread_func(struct kthread_work *work)
 {
 	int fqs_state;
 	int gf;
 	unsigned long j;
 	int ret;
-	struct rcu_state *rsp = arg;
+	struct rcu_state *rsp = container_of(work, struct rcu_state, gp_work);
 	struct rcu_node *rnp = rcu_get_root(rsp);
 
-	rcu_bind_gp_kthread();
+	/* Handle grace-period start. */
 	for (;;) {
+		trace_rcu_grace_period(rsp->name,
+				       READ_ONCE(rsp->gpnum),
+				       TPS("reqwait"));
+		rsp->gp_state = RCU_GP_WAIT_GPS;
+		wait_event_interruptible(rsp->gp_wq,
+					 READ_ONCE(rsp->gp_flags) &
+					 RCU_GP_FLAG_INIT);

Same here.  Why not convert the waker into a queueing event?

+		/* Locking provides needed memory barrier. */
+		if (rcu_gp_init(rsp))
+			break;
+		cond_resched_rcu_qs();
+		WRITE_ONCE(rsp->gp_activity, jiffies);
+		WARN_ON(signal_pending(current));
+		trace_rcu_grace_period(rsp->name,
+				       READ_ONCE(rsp->gpnum),
+				       TPS("reqwaitsig"));
+	}

Thanks.

-- 
tejun

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