> > I have no idea what causes:
> >
> > APIC error on CPU0: 00(00)
> >
> > Is it an ACPI problem?
What CPU/chipset?
>
> Strange. x86_64 has that stray exit_idle() in smp_error_interrupt() but
> afaict it won't cause this to happen.
>
> What's that idle_notifier doing in x86_64 anyway?
I originally added it for my (now abandoned in favour of dyntick) noidletick
implementation. I would have removed it again, but perfmon plans to use it
too and I suspect dyntick will too (?)
> It appears to have no
> users. If there _is_ a user, and if its IDLE_END handler is altering the
> preempt-count then perhaps there's your explanation.
There shouldn't be a user currently in tree.
> But it all appears to be dead code to me.
Right now it is yes.
-Andi
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