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-rw-r--r--include/linux/rcutiny.h4
-rw-r--r--kernel/rcutiny_plugin.h15
2 files changed, 12 insertions, 7 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index 51bf29c81485..e93df77176d1 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -27,13 +27,9 @@
#include <linux/cache.h>
-#ifdef CONFIG_RCU_BOOST
static inline void rcu_init(void)
{
}
-#else /* #ifdef CONFIG_RCU_BOOST */
-void rcu_init(void);
-#endif /* #else #ifdef CONFIG_RCU_BOOST */
static inline void rcu_barrier_bh(void)
{
diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
index b58a3200f0ff..95df60ebe363 100644
--- a/kernel/rcutiny_plugin.h
+++ b/kernel/rcutiny_plugin.h
@@ -914,7 +914,8 @@ static void rcu_preempt_process_callbacks(void)
static void invoke_rcu_callbacks(void)
{
have_rcu_kthread_work = 1;
- wake_up(&rcu_kthread_wq);
+ if (rcu_kthread_task != NULL)
+ wake_up(&rcu_kthread_wq);
}
#ifdef CONFIG_RCU_TRACE
@@ -975,12 +976,16 @@ early_initcall(rcu_spawn_kthreads);
#else /* #ifdef CONFIG_RCU_BOOST */
+/* Hold off callback invocation until early_initcall() time. */
+static int rcu_scheduler_fully_active __read_mostly;
+
/*
* Start up softirq processing of callbacks.
*/
void invoke_rcu_callbacks(void)
{
- raise_softirq(RCU_SOFTIRQ);
+ if (rcu_scheduler_fully_active)
+ raise_softirq(RCU_SOFTIRQ);
}
#ifdef CONFIG_RCU_TRACE
@@ -995,10 +1000,14 @@ static bool rcu_is_callbacks_kthread(void)
#endif /* #ifdef CONFIG_RCU_TRACE */
-void rcu_init(void)
+static int __init rcu_scheduler_really_started(void)
{
+ rcu_scheduler_fully_active = 1;
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+ raise_softirq(RCU_SOFTIRQ); /* Invoke any callbacks from early boot. */
+ return 0;
}
+early_initcall(rcu_scheduler_really_started);
#endif /* #else #ifdef CONFIG_RCU_BOOST */