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    SubjectRe: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support
    On Tue, 30 Jun 2009, Ingo Molnar wrote:

    > Yeah, it's a bug for something like a virtual environment which
    > boots generic kernels that might have 64 possible CPUs (on a true
    > 64-way system), but which will have fewer in practice.

    A machine (and a virtual environment) can indicate via the BIOS tables or
    ACPI that there are less "possible" cpus. That is actually very common.

    The difference between actual and possible cpus only has to be the number
    of processors that could be brought up later. In a regular system that is
    pretty much zero. In a fancy system with actual hotpluggable cpus there
    would be a difference but usually the number of hotpluggable cpus is
    minimal.



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