Messages in this thread | | | Date | Thu, 9 Feb 2006 10:59:22 -0600 | From | Nathan Lynch <> | Subject | Re: [PATCH] percpu data: only iterate over possible CPUs |
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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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