Update /debug/tracing/README

[safe/jmp/linux-2.6] / kernel / rcutree.c

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index a342b03..97ce315 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -79,7 +79,10 @@ struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state);
 DEFINE_PER_CPU(struct rcu_data, rcu_bh_data);
 
 #ifdef CONFIG_NO_HZ
-DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks);
+DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {
+       .dynticks_nesting = 1,
+       .dynticks = 1,
+};
 #endif /* #ifdef CONFIG_NO_HZ */
 
 static int blimit = 10;                /* Maximum callbacks per softirq. */
@@ -572,6 +575,7 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
        /* Special-case the common single-level case. */
        if (NUM_RCU_NODES == 1) {
                rnp->qsmask = rnp->qsmaskinit;
+               rsp->signaled = RCU_SIGNAL_INIT; /* force_quiescent_state OK. */
                spin_unlock_irqrestore(&rnp->lock, flags);
                return;
        }
@@ -944,8 +948,8 @@ static void rcu_do_batch(struct rcu_data *rdp)
 void rcu_check_callbacks(int cpu, int user)
 {
        if (user ||
-           (idle_cpu(cpu) && !in_softirq() &&
-                               hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+           (idle_cpu(cpu) && rcu_scheduler_active &&
+            !in_softirq() && hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
 
                /*
                 * Get here if this CPU took its interrupt from user
@@ -1310,7 +1314,7 @@ int rcu_needs_cpu(int cpu)
  * access due to the fact that this CPU cannot possibly have any RCU
  * callbacks in flight yet.
  */
-static void
+static void __cpuinit
 rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
 {
        unsigned long flags;
@@ -1379,13 +1383,6 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
 
 static void __cpuinit rcu_online_cpu(int cpu)
 {
-#ifdef CONFIG_NO_HZ
-       struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu);
-
-       rdtp->dynticks_nesting = 1;
-       rdtp->dynticks |= 1;    /* need consecutive #s even for hotplug. */
-       rdtp->dynticks_nmi = (rdtp->dynticks_nmi + 1) & ~0x1;
-#endif /* #ifdef CONFIG_NO_HZ */
        rcu_init_percpu_data(cpu, &rcu_state);
        rcu_init_percpu_data(cpu, &rcu_bh_state);
        open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);