When hotplug happens, the plug code will also grab the manager_mutex,
it will break too_many_workers()'s assumption, and make too_many_workers()
ugly(kick the timer wrongly, no found bug).
To avoid assumption-coruption, we add the original POOL_MANAGING_WORKERS back.
Signed-off-by: Lai Jiangshan
When hotplug happens, the plug code will also grab the manager_mutex,
it will break too_many_workers()'s assumption, and make too_many_workers()
ugly(kick the timer wrongly, no found bug).
To avoid assumption-coruption, we add the original POOL_MANAGING_WORKERS back.
Signed-off-by: Lai Jiangshan
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