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-rw-r--r--kernel/rcutiny_plugin.h29
1 files changed, 27 insertions, 2 deletions
diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
index 2b0484a5dc28..9cb1ae4aabdd 100644
--- a/kernel/rcutiny_plugin.h
+++ b/kernel/rcutiny_plugin.h
@@ -312,8 +312,8 @@ static int rcu_boost(void)
rt_mutex_lock(&mtx);
rt_mutex_unlock(&mtx); /* Keep lockdep happy. */
- return rcu_preempt_ctrlblk.boost_tasks != NULL ||
- rcu_preempt_ctrlblk.exp_tasks != NULL;
+ return ACCESS_ONCE(rcu_preempt_ctrlblk.boost_tasks) != NULL ||
+ ACCESS_ONCE(rcu_preempt_ctrlblk.exp_tasks) != NULL;
}
/*
@@ -885,6 +885,19 @@ static void invoke_rcu_callbacks(void)
wake_up(&rcu_kthread_wq);
}
+#ifdef CONFIG_RCU_TRACE
+
+/*
+ * Is the current CPU running the RCU-callbacks kthread?
+ * Caller must have preemption disabled.
+ */
+static bool rcu_is_callbacks_kthread(void)
+{
+ return rcu_kthread_task == current;
+}
+
+#endif /* #ifdef CONFIG_RCU_TRACE */
+
/*
* This kthread invokes RCU callbacks whose grace periods have
* elapsed. It is awakened as needed, and takes the place of the
@@ -938,6 +951,18 @@ void invoke_rcu_callbacks(void)
raise_softirq(RCU_SOFTIRQ);
}
+#ifdef CONFIG_RCU_TRACE
+
+/*
+ * There is no callback kthread, so this thread is never it.
+ */
+static bool rcu_is_callbacks_kthread(void)
+{
+ return false;
+}
+
+#endif /* #ifdef CONFIG_RCU_TRACE */
+
void rcu_init(void)
{
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);