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SubjectHotplug / TSC cleanup and fixing
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Greatly simplified version of the patches; allocate and dealloc
all required structs at module load and unload time.

Clarification: per_cpu(var, cpu) does indeed work for not-present CPUs;
the allocations for module specific per-cpu variables are done at module
load and unload time, while the per_cpu chunks are setup for all possible
CPUs at boot time.



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