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    SubjectRe: [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time
    Chuck Ebbert <> 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.


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