Re: [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time

[Andi Kleen]

Chuck Ebbert <cebbert@xxxxxxxxxx> writes:

> The default number of additional CPU IDs for hotplugging is determined
> by asking ACPI or mptables how many "disabled" CPUs there are in the
> system, but many systems get this wrong so that e.g. a uniprocessor
> machine gets an extra CPU allocated and never switches to single CPU
> mode.

You can set this with additional_cpus=... at boot time.
I don't think each runtime option needs a CONFIG option too.

-Andi
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