Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

[Andi Kleen]

> Why do we have per-cpu firmware anyway?

Consider CPU hotplug.  A newly plugged CPU is not updated yet, but will
be after hotplug.

However i suppose it would be possible to do the update early in the 
boot up sequence before others can use it. That would avoid this problem.

-Andi
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