On Fri, Jul 20, 2007 at 11:17:49AM -0400, Mathieu Desnoyers wrote:
> * Zachary Amsden ([email protected]) wrote:
> > Mathieu Desnoyers wrote:
> > >Yes, kprobes is case 1: atomic update. And we don't even have to bother
> > >about Intel's erratum. This one is ok. That's mainly the
> > >alternatives/paravirt code I worry about.
> > >
> >
> > Paravirt and alternatives should all be ok because they are done before
> > SMP bringup and with NMIs disabled. NMI watchdog is not setup until
> > smp_prepare_cpus/check_nmi_watchdog, which happens way later, not during
> > parse_args/setup_nmi_watchdog, which just decides which type of watchdog
> > to setup.
> >
>
> I'm not so sure about this. You are right in that it has nothing to do
> with parse_args, but I just went in detail through the source, and the
> order seems to be:
>
> 1 - NMI is activated
> 2 - MCE is activated
> 3 - alternatives are applied
Yes I was wrong on this. I now added code to disable them again -- see
the later patch I posted
-Andi
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