* Brian Gerst <[email protected]> wrote:
> > Btw., there's a neat trick we could do: in the HLT, MWAIT and
> > ACPI-idle code we could attempt to set up RCX to match RIP, to
> > trigger this optimization in the common 'irq interrupted the idle
> > task' case?
>
> sysret only returns to CPL3.
Indeed, an IRET ought to be pretty cheap for same-ring interrupt
returns in any case.
Thanks,
Ingo
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