Re: [PATCH 01/14] Introduce cpu_enabled_map and friends

[Andi Kleen]

Matthew Wilcox <matthew@xxxxxx> writes:
>
> I don't understand why we want to know about these CPUs.  Surely they
> should be 'possible', but not 'present'?  What useful thing can Linux do
> with them?

He explained it in the intro, near the end (I nearly complained about
this too when I hadn't finished reading it completely :):

|The big picture implication is that we can allow userspace
|to interact with disabled CPUs. In this particular example,
|we provide a knob that lets a sysadmin schedule any present
|CPU for firmware deconfiguration or enablement.

The reason sounds pretty exotic, but ok.

-Andi
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