linux-kernel - Re: [PATCH v3 0/3] SRF: Fix offline CPU preventing pc6 entry

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Message-ID: <20241112114543.GP22801@noisy.programming.kicks-ass.net>
Date: Tue, 12 Nov 2024 12:45:43 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Patryk Wlazlyn <patryk.wlazlyn@...ux.intel.com>
Cc: 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
Subject: Re: [PATCH v3 0/3] SRF: Fix offline CPU preventing pc6 entry

On Fri, Nov 08, 2024 at 01:29:06PM +0100, Patryk Wlazlyn wrote:

> Removing the existing "kexec hack" by bringing all offlined CPUs back
> online before proceeding with the kexec would make it even simpler, but
> I am not sure we can do that. It looks kind of obvious to me, but for
> some reason the hack exist.

There's a comment there that explains why this is done. If you don't
understand this, then please don't touch this code.