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    SubjectRe: [PATCH] CONFIG_NR_CPUS, redux
    Ruth Ivimey-Cook wrote:

    > Perhaps it's just because I'm coming in late, but I cannot understand why
    > NR_CPUS cannot be as low as 4 by default, for all archs, and then in the
    > kernel boot messages, should more be found than is configured for a message is
    > emitted to say "reconfigure your kernel", and continue with the number it was
    > configured for. I personally only rarely see 2-way boxes, 4-way is pretty
    > rare, and anything more must surely count as very specialized.
    Why not let the boot process select the highest of two numbers,
    the (default-low) NR_CPUS and the number of CPU's detected?

    Boot with "too many" cpu's and you still get to use them - you
    merely can't hotplug even more.

    Configuring a high NR_CPUS becomes something only hot-pluggers
    need to do, or those whose architecture doesn't support
    cpu detection in the early boot process. Those with a fixed
    number of detectable CPUs can simply go with a default of
    NR_CPUS=2 no matter what they actually have.

    Helge Hafting
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