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[CPU hot-plug] Why we need to run STOPMACHINE state?
Hi all,
When we call _cpu_down to stop cpus, each cpu will run "stop_machine_cpu_stop" function to stop themselves. In "stop_machine_cpu_stop", they will run STOPMACHINE states to wait each other.
Can we remove the state-machine to speedup the time of closing cpus? Will it cause any risk? I have no idea why they need to wait each other to finish the state when they are closed.
Thanks.
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