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alpha: Send stop IPI to send to online CPUs
[ Upstream commit caace6ca4e
]
This issue was noticed while debugging a shutdown issue where some
secondary CPUs are not being shutdown correctly. A fix for that [1] requires
that secondary cpus be offlined using the cpu_online_mask so that the
stop operation is a no-op if CPU HOTPLUG is disabled. I, like the author in
[1] looked at the architectures and found that alpha is one of two
architectures that executes smp_send_stop() on all possible CPUs.
On alpha, smp_send_stop() sends an IPI to all possible CPUs but only needs
to send them to online CPUs.
Send the stop IPI to only the online CPUs.
[1] https://lkml.org/lkml/2020/1/10/250
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -585,7 +585,7 @@ void
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smp_send_stop(void)
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{
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cpumask_t to_whom;
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cpumask_copy(&to_whom, cpu_possible_mask);
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cpumask_copy(&to_whom, cpu_online_mask);
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cpumask_clear_cpu(smp_processor_id(), &to_whom);
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#ifdef DEBUG_IPI_MSG
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if (hard_smp_processor_id() != boot_cpu_id)
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