Messages in this thread | | | Date | Tue, 8 Feb 2022 08:56:20 -1000 | From | Tejun Heo <> | Subject | Re: [PATCH rcu 3/3] rcu: Allow expedited RCU grace periods on incoming CPUs |
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On Fri, Feb 04, 2022 at 02:55:07PM -0800, Paul E. McKenney wrote: > Although it is usually safe to invoke synchronize_rcu_expedited() from a > preemption-enabled CPU-hotplug notifier, if it is invoked from a notifier > between CPUHP_AP_RCUTREE_ONLINE and CPUHP_AP_ACTIVE, its attempts to > invoke a workqueue handler will hang due to RCU waiting on a CPU that > the scheduler is not paying attention to. This commit therefore expands > use of the existing workqueue-independent synchronize_rcu_expedited() > from early boot to also include CPUs that are being hotplugged. > > Link: https://lore.kernel.org/lkml/7359f994-8aaf-3cea-f5cf-c0d3929689d6@quicinc.com/ > Reported-by: Mukesh Ojha <quic_mojha@quicinc.com> > Cc: Tejun Heo <tj@kernel.org> > Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
-- tejun
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