Re: [PATCH] percpu data: only iterate over possible CPUs
From: Heiko Carstens
Date: Thu Feb 09 2006 - 11:11:34 EST
> > 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...
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