linux-kernel - Re: [PATCH v1 0/2] x86/smp: Fix power regression introduced by commit 96040f7273e2

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Message-ID: <20250529085358.GY24938@noisy.programming.kicks-ass.net>
Date: Thu, 29 May 2025 10:53:58 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
	x86 Maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM <linux-pm@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	"Gautham R. Shenoy" <gautham.shenoy@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Todd Brandt <todd.e.brandt@...ux.intel.com>
Subject: Re: [PATCH v1 0/2] x86/smp: Fix power regression introduced by
 commit 96040f7273e2

On Wed, May 28, 2025 at 07:09:21PM +0200, Rafael J. Wysocki wrote:

> And I object to leaving a user-visible regression behind.

So we go fix it differently. 

Why can't we initialize cpuidle before SMP bringup?