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    SubjectRe: [PATCH] percpu data: only iterate over possible CPUs
    Heiko Carstens wrote:
    > > > Presumably not all architectures are doing that.
    > > powerpc/ppc64, for instance, determines the number of possible cpus
    > > from information exported by firmware (and I'm mystified as to why
    > > other platforms don't do this). So it's typical to have a kernel an a
    > > pSeries partition with NR_CPUS=128, but cpu_possible_map = 0xff.
    >
    > Simply because there is no such interface on s390. The only thing we know
    > for sure is that if we are running under z/VM the user is free to
    > configure up to 63 additional virtual cpus on the fly...

    My "mystified" parenthetical was not meant as a criticism of
    arch/!powerpc, but of the platform implementations themselves, for not
    making such an interface available.
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