linux-kernel - Re: Early boot regression from f0551af0213 ("x86/topology: Ignore non-present APIC IDs in a present package")

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Date: Thu, 25 Apr 2024 04:11:16 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Lyude Paul <lyude@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: Early boot regression from f0551af0213 ("x86/topology: Ignore
 non-present APIC IDs in a present package")

Lyude!

On Wed, Apr 24 2024 at 16:56, Lyude Paul wrote:
> On Sat, 2024-04-20 at 00:15 +0200, Thomas Gleixner wrote:
> Lyude is fine BTW :P (I get the confusion though, Paul is usually not a
> last name lol)

:)

> Anyway - unfortunately it doesn't seem like this patch helps :s, I'm
> still not seeing any difference and the backtrace I'm seeing at early
> boot looks the same. Any more information I can provide?

Can you please boot a kernel with the commit in question reverted and
add 'possible_cpus=8' to the kernel command line?

In theory this should fail too.

Thanks,

        tglx