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SubjectRe: More than 8 CPUs detected and CONFIG_X86_PC cannot handle it on 2.6.16-rc6
Ashok Raj wrote:
> On Mon, Mar 13, 2006 at 02:22:23PM -0800, Andrew Morton wrote:
> >
> > And does it affect pretend-x86-hotplug, or is it only affecting real hotplug?
> >
> its no more pretend-x86, in the past we used to put the cpu in idle(),
> now we do put the cpu in halt and bring back by another startup ipi, just like
> boot sequence, both for x86 and x86_64.

That's actually broken since 2.6.14 (at least on my P3 box); please
see:

Subject: i386 cpu hotplug bug - instant reboot when onlining secondary

http://lkml.org/lkml/2006/2/19/186


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