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

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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