Commit 776d6807 authored Oct 23, 2014 by Paul E. McKenney

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 <paulmck@linux.vnet.ibm.com>

parent 28f6569a

kernel/rcu/tree.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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;