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rcu: Do any deferred nocb wakeups at CPU offline time
Because the need to wake a nocb GP kthread ("rcuog") is sometimes detected when wakeups cannot be done, these wakeups can be deferred. The wakeups are then carried out by calls to do_nocb_deferred_wakeup() at various safe points in the code, including RCU's idle hooks. However, when a CPU goes offline, it invokes arch_cpu_idle_dead() without invoking any of RCU's idle hooks. This commit therefore adds a call to do_nocb_deferred_wakeup() in rcu_report_dead() in order to handle any deferred wakeups that have been requested by the outgoing CPU. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -4178,6 +4178,9 @@ void rcu_report_dead(unsigned int cpu)
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struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
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struct rcu_node *rnp = rdp->mynode; /* Outgoing CPU's rdp & rnp. */
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// Do any dangling deferred wakeups.
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do_nocb_deferred_wakeup(rdp);
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/* QS for any half-done expedited grace period. */
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preempt_disable();
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rcu_report_exp_rdp(this_cpu_ptr(&rcu_data));
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