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SubjectRe: [PATCH rcu 3/3] rcu: Allow expedited RCU grace periods on incoming CPUs
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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