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-rw-r--r--kernel/rcutree_plugin.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index cd2ab67400c6..201334cdc200 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -259,6 +259,18 @@ static int rcu_preempted_readers(struct rcu_node *rnp)
return !list_empty(&rnp->blocked_tasks[rnp->gpnum & 0x1]);
}
+#ifdef CONFIG_HOTPLUG_CPU
+
+/*
+ * Do CPU-offline processing for preemptable RCU.
+ */
+static void rcu_preempt_offline_cpu(int cpu)
+{
+ __rcu_offline_cpu(cpu, &rcu_preempt_state);
+}
+
+#endif /* #ifdef CONFIG_HOTPLUG_CPU */
+
/*
* Check for a quiescent state from the current CPU. When a task blocks,
* the task is recorded in the corresponding CPU's rcu_node structure,
@@ -395,6 +407,18 @@ static int rcu_preempted_readers(struct rcu_node *rnp)
return 0;
}
+#ifdef CONFIG_HOTPLUG_CPU
+
+/*
+ * Because preemptable RCU does not exist, it never needs CPU-offline
+ * processing.
+ */
+static void rcu_preempt_offline_cpu(int cpu)
+{
+}
+
+#endif /* #ifdef CONFIG_HOTPLUG_CPU */
+
/*
* Because preemptable RCU does not exist, it never has any callbacks
* to check.