> This patch stops waking up of tasks onto offline processors. We need
> this when migrating tasks from offline processors onto other online ones
> and to avert a livelock whilst doing so.
this code too should be done in a separate 'zap_runqueue()' function,
which also needs to iterate through all tasks and migrate them off to an
online CPU. This code definitely does not belong into the wakeup hotpath.
Ingo
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