Re: [RFC PATCH v4 5/8] x86/smp native_play_dead: Prefer cpuidle_play_dead() over mwait_play_dead()

[Patryk Wlazlyn]

>>> If you first make intel_idle provide :enter_dead() for all CPUs on all
>>> platforms and implement it by calling mwait_play_dead_with_hint(), you
>>> won't need mwait_play_dead() any more.
>> Crossed my mind, but because mwait_play_dead doesn't filter on Intel
>> vendor specifically,
>
> In practice, it does.
>
> The vendor check in it is equivalent to "if Intel".

Actually, what about INTEL_IDLE=n?
We might hit acpi_idle, which would call mwait_play_dead_with_hint() now, but
if we don't, don't we want to try mwait_play_dead before hlt or is it too
unrealistic to happen?