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-rw-r--r--kernel/rcutree_plugin.h33
1 files changed, 14 insertions, 19 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 3f6559a..c8bff30 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -1196,8 +1196,7 @@ static int rcu_boost_kthread(void *arg)
for (;;) {
rnp->boost_kthread_status = RCU_KTHREAD_WAITING;
- wait_event_interruptible(rnp->boost_wq, rnp->boost_tasks ||
- rnp->exp_tasks);
+ rcu_wait(rnp->boost_tasks || rnp->exp_tasks);
rnp->boost_kthread_status = RCU_KTHREAD_RUNNING;
more2boost = rcu_boost(rnp);
if (more2boost)
@@ -1275,14 +1274,6 @@ static void rcu_preempt_boost_start_gp(struct rcu_node *rnp)
}
/*
- * Initialize the RCU-boost waitqueue.
- */
-static void __init rcu_init_boost_waitqueue(struct rcu_node *rnp)
-{
- init_waitqueue_head(&rnp->boost_wq);
-}
-
-/*
* Create an RCU-boost kthread for the specified node if one does not
* already exist. We only create this kthread for preemptible RCU.
* Returns zero if all is well, a negated errno otherwise.
@@ -1306,12 +1297,17 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
raw_spin_lock_irqsave(&rnp->lock, flags);
rnp->boost_kthread_task = t;
raw_spin_unlock_irqrestore(&rnp->lock, flags);
- wake_up_process(t);
sp.sched_priority = RCU_KTHREAD_PRIO;
sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
return 0;
}
+static void __cpuinit rcu_wake_one_boost_kthread(struct rcu_node *rnp)
+{
+ if (rnp->boost_kthread_task)
+ wake_up_process(rnp->boost_kthread_task);
+}
+
#else /* #ifdef CONFIG_RCU_BOOST */
static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
@@ -1328,10 +1324,6 @@ static void rcu_preempt_boost_start_gp(struct rcu_node *rnp)
{
}
-static void __init rcu_init_boost_waitqueue(struct rcu_node *rnp)
-{
-}
-
static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
struct rcu_node *rnp,
int rnp_index)
@@ -1339,6 +1331,10 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
return 0;
}
+static void __cpuinit rcu_wake_one_boost_kthread(struct rcu_node *rnp)
+{
+}
+
#endif /* #else #ifdef CONFIG_RCU_BOOST */
#ifndef CONFIG_SMP
@@ -1520,7 +1516,6 @@ int rcu_needs_cpu(int cpu)
{
int c = 0;
int snap;
- int snap_nmi;
int thatcpu;
/* Check for being in the holdoff period. */
@@ -1531,10 +1526,10 @@ int rcu_needs_cpu(int cpu)
for_each_online_cpu(thatcpu) {
if (thatcpu == cpu)
continue;
- snap = per_cpu(rcu_dynticks, thatcpu).dynticks;
- snap_nmi = per_cpu(rcu_dynticks, thatcpu).dynticks_nmi;
+ snap = atomic_add_return(0, &per_cpu(rcu_dynticks,
+ thatcpu).dynticks);
smp_mb(); /* Order sampling of snap with end of grace period. */
- if (((snap & 0x1) != 0) || ((snap_nmi & 0x1) != 0)) {
+ if ((snap & 0x1) != 0) {
per_cpu(rcu_dyntick_drain, cpu) = 0;
per_cpu(rcu_dyntick_holdoff, cpu) = jiffies - 1;
return rcu_needs_cpu_quick_check(cpu);
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