linux-kernel - Re: [RFC PATCH v4 5/8] x86/smp native_play_dead: Prefer cpuidle_play_dead() over mwait_play

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Message-ID: <CAJZ5v0hZ8ajccb=B7P5g1+KJ+tsw5vP-e9ix7j_65WgT34H1XQ@mail.gmail.com>
Date: Mon, 25 Nov 2024 15:48:26 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Patryk Wlazlyn <patryk.wlazlyn@...ux.intel.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, rafael.j.wysocki@...el.com, len.brown@...el.com, 
	artem.bityutskiy@...ux.intel.com, dave.hansen@...ux.intel.com, 
	peterz@...radead.org, tglx@...utronix.de, gautham.shenoy@....com
Subject: Re: [RFC PATCH v4 5/8] x86/smp native_play_dead: Prefer
 cpuidle_play_dead() over mwait_play_dead()

On Mon, Nov 25, 2024 at 3:43 PM Patryk Wlazlyn
<patryk.wlazlyn@...ux.intel.com> wrote:
>
> > 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".

> I thought that I might break some edge case.
>
>
> I am all for simplifying.