---

yaml
---
r: 168439
b: refs/heads/master
c: 83f5b01
h: refs/heads/master
i:
  168437: f8b5105
  168435: e5632cc
  168431: e2d704f
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b00bc0b237055b4c45816325ee14f0bd83e6f590
+refs/heads/master: 83f5b01ffbbaea6f97c9a79d21e240dbfb69f2f1

trunk/kernel/rcutree.c

@@ -59,7 +59,7 @@
 		NUM_RCU_LVL_2, \
 		NUM_RCU_LVL_3, /* == MAX_RCU_LVLS */ \
 	}, \
-	.signaled = RCU_SIGNAL_INIT, \
+	.signaled = RCU_GP_IDLE, \
 	.gpnum = -300, \
 	.completed = -300, \
 	.onofflock = __SPIN_LOCK_UNLOCKED(&name.onofflock), \
@@ -657,14 +657,17 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
 	 * irqs disabled.
 	 */
 	rcu_for_each_node_breadth_first(rsp, rnp) {
-		spin_lock(&rnp->lock);	/* irqs already disabled. */
+		spin_lock(&rnp->lock);		/* irqs already disabled. */
 		rcu_preempt_check_blocked_tasks(rnp);
 		rnp->qsmask = rnp->qsmaskinit;
 		rnp->gpnum = rsp->gpnum;
-		spin_unlock(&rnp->lock);	/* irqs already disabled. */
+		spin_unlock(&rnp->lock);	/* irqs remain disabled. */
 	}
 
+	rnp = rcu_get_root(rsp);
+	spin_lock(&rnp->lock);			/* irqs already disabled. */
 	rsp->signaled = RCU_SIGNAL_INIT; /* force_quiescent_state now OK. */
+	spin_unlock(&rnp->lock);		/* irqs remain disabled. */
 	spin_unlock_irqrestore(&rsp->onofflock, flags);
 }
 
@@ -706,6 +709,7 @@ static void cpu_quiet_msk_finish(struct rcu_state *rsp, unsigned long flags)
 {
 	WARN_ON_ONCE(!rcu_gp_in_progress(rsp));
 	rsp->completed = rsp->gpnum;
+	rsp->signaled = RCU_GP_IDLE;
 	rcu_process_gp_end(rsp, rsp->rda[smp_processor_id()]);
 	rcu_start_gp(rsp, flags);  /* releases root node's rnp->lock. */
 }
@@ -1162,9 +1166,10 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 	}
 	spin_unlock(&rnp->lock);
 	switch (signaled) {
+	case RCU_GP_IDLE:
 	case RCU_GP_INIT:
 
-		break; /* grace period still initializing, ignore. */
+		break; /* grace period idle or initializing, ignore. */
 
 	case RCU_SAVE_DYNTICK:
 
@@ -1178,7 +1183,8 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 
 		/* Update state, record completion counter. */
 		spin_lock(&rnp->lock);
-		if (lastcomp == rsp->completed) {
+		if (lastcomp == rsp->completed &&
+		    rsp->signaled == RCU_SAVE_DYNTICK) {
 			rsp->signaled = RCU_FORCE_QS;
 			dyntick_record_completed(rsp, lastcomp);
 		}

trunk/kernel/rcutree.h

@@ -201,9 +201,10 @@ struct rcu_data {
 };
 
 /* Values for signaled field in struct rcu_state. */
-#define RCU_GP_INIT		0	/* Grace period being initialized. */
-#define RCU_SAVE_DYNTICK	1	/* Need to scan dyntick state. */
-#define RCU_FORCE_QS		2	/* Need to force quiescent state. */
+#define RCU_GP_IDLE		0	/* No grace period in progress. */
+#define RCU_GP_INIT		1	/* Grace period being initialized. */
+#define RCU_SAVE_DYNTICK	2	/* Need to scan dyntick state. */
+#define RCU_FORCE_QS		3	/* Need to force quiescent state. */
 #ifdef CONFIG_NO_HZ
 #define RCU_SIGNAL_INIT		RCU_SAVE_DYNTICK
 #else /* #ifdef CONFIG_NO_HZ */