Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu

* 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu:
  rcu: Prevent RCU callbacks from executing before scheduler initialized

1 files changed, 11 insertions, 4 deletions

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 14dc7dd00902..75113cb7c4fb 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -1532,7 +1532,7 @@ static int __cpuinit rcu_spawn_one_cpu_kthread(int cpu)
         struct sched_param sp;
         struct task_struct *t;
 
-        if (!rcu_kthreads_spawnable ||
+        if (!rcu_scheduler_fully_active ||
             per_cpu(rcu_cpu_kthread_task, cpu) != NULL)
                 return 0;
         t = kthread_create(rcu_cpu_kthread, (void *)(long)cpu, "rcuc%d", cpu);
@@ -1639,7 +1639,7 @@ static int __cpuinit rcu_spawn_one_node_kthread(struct rcu_state *rsp,
         struct sched_param sp;
         struct task_struct *t;
 
-        if (!rcu_kthreads_spawnable ||
+        if (!rcu_scheduler_fully_active ||
             rnp->qsmaskinit == 0)
                 return 0;
         if (rnp->node_kthread_task == NULL) {
@@ -1665,7 +1665,7 @@ static int __init rcu_spawn_kthreads(void)
         int cpu;
         struct rcu_node *rnp;
 
-        rcu_kthreads_spawnable = 1;
+        rcu_scheduler_fully_active = 1;
         for_each_possible_cpu(cpu) {
                 per_cpu(rcu_cpu_has_work, cpu) = 0;
                 if (cpu_online(cpu))
@@ -1687,7 +1687,7 @@ static void __cpuinit rcu_prepare_kthreads(int cpu)
         struct rcu_node *rnp = rdp->mynode;
 
         /* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */
-        if (rcu_kthreads_spawnable) {
+        if (rcu_scheduler_fully_active) {
                 (void)rcu_spawn_one_cpu_kthread(cpu);
                 if (rnp->node_kthread_task == NULL)
                         (void)rcu_spawn_one_node_kthread(rcu_state, rnp);
@@ -1726,6 +1726,13 @@ static void rcu_cpu_kthread_setrt(int cpu, int to_rt)
 {
 }
 
+static int __init rcu_scheduler_really_started(void)
+{
+        rcu_scheduler_fully_active = 1;
+        return 0;
+}
+early_initcall(rcu_scheduler_really_started);
+
 static void __cpuinit rcu_prepare_kthreads(int cpu)
 {
 }