Re: [ACPI] Re: [RFC 0/6] S3 SMP support with physcial CPU hotplug

Pavel Machek
2005-04-04T09:32:32Z

Hi!

> > > > I'm switching suspend2 to use hotplug too. Li, I'll try adding your
> > > > patches as well as Zwane's if you like
> > > Great!
> > >
> > > > (suspend2 can enter S3, S4 or S5
> > > > after writing the image). I'd love to try it on my HT desktop, and
> > > > hotplug will get more testing too :>
> > > Unfortunately, my patches break Pavel's swsusp SMP, as my patches break
> > > current 'cpu_up' mechanism. S4 doesn't require to boot AP CPUs from real
> > > mode.
> >
> > Uh, I don't like that one. Is it possible to put secondary CPUs back
> > to the real mode
> Possibly doesn't need the trouble. Send a SIPI also can wakeup the a CPU
> in protected mode.
>
> > so that cpu_up mechanism can handle them?
> If S4 also calls a smp_prepare_cpu, then the patches don't break S4. If
> people don't complain warm boot a CPU is slow, I'd like S4 also use
> smp_prepare_cpu.

Okay, that seems like a solution. Slowness should not really be a
problem (unless it takes > few seconds)...
Pavel

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