From 776d680711f4836964f3005ee53794661ca74629 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 23 Oct 2014 10:50:41 -0700 Subject: [PATCH] rcu: Kick rcuo kthreads after their CPU goes offline If a no-CBs CPU were to post an RCU callback with interrupts disabled after it entered the idle loop for the last time, there might be no deferred wakeup for the corresponding rcuo kthreads. This commit therefore adds a set of calls to do_nocb_deferred_wakeup() after the CPU has gone completely offline. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 9e3c20f117cd..07bf4aa68d50 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3497,8 +3497,10 @@ static int rcu_cpu_notify(struct notifier_block *self, case CPU_DEAD_FROZEN: case CPU_UP_CANCELED: case CPU_UP_CANCELED_FROZEN: - for_each_rcu_flavor(rsp) + for_each_rcu_flavor(rsp) { rcu_cleanup_dead_cpu(cpu, rsp); + do_nocb_deferred_wakeup(per_cpu_ptr(rsp->rda, cpu)); + } break; default: break; -- 2.39.5