[PATCH RFC -rt] Alleged fix for CPU-hotplug deadlock
From: Paul E. McKenney <hidden>
Date: 2012-02-21 20:00:50
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
This patch is intended to fix a deadlock seen in -rt. Untested, might not even compile. The intent is to move kthread_stop() outside of the CPU-hotplug lock, thus preventing deadlocks involving sleeping spinlocks. Signed-off-by: Paul E. McKenney <redacted>
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 8c26a49..e0d514b 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c@@ -2041,8 +2041,7 @@ static int __cpuinit rcu_cpu_notify(struct notifier_block *self, rcu_send_cbs_to_online(&rcu_sched_state); rcu_preempt_send_cbs_to_online(); break; - case CPU_DEAD: - case CPU_DEAD_FROZEN: + case CPU_POST_DEAD: case CPU_UP_CANCELED: case CPU_UP_CANCELED_FROZEN: rcu_offline_cpu(cpu);