[Xen-devel] [PATCH 1/5] xen: Always calculate max_cpus value

Daniel Kiper daniel.kiper at oracle.com
Fri Jul 13 09:19:07 EDT 2012

On Thu, Jul 05, 2012 at 04:56:39PM +0100, Jan Beulich wrote:
> >>> On 05.07.12 at 17:00, Daniel Kiper <daniel.kiper at oracle.com> wrote:
> > max_cpus is not available since 20374 changeset (Miscellaneous data
> > placement adjustments). It was moved to __initdata section. This section
> > is freed after Xen initialization. Assume that max_cpus is always
> > equal to XEN_HYPER_SIZE(cpumask_t) * 8.
> Using nr_cpu_ids, when available, would seem a better fit. And

Hmmm... I could not find such animal in Xen source code.
However, maybe I missed something.

> I donm't see why, on dumps from old hypervisors, you wouldn't
> want to continue using max_cpus. Oh, wait, I see - you would
> have to be able to tell whether it actually sits in .init.data, which
> might not be strait forward.

Yep, but I will try to improve that once again.


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