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

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Date: Tue, 14 May 2024 10:25:01 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Lyude Paul <lyude@...hat.com>, "Linux regression tracking
 (Thorsten Leemhuis)" <regressions@...mhuis.info>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, Mario Limonciello
 <mario.limonciello@....com>, Borislav Petkov <bp@...en8.de>, Linux kernel
 regressions list <regressions@...ts.linux.dev>
Subject: Re: Early boot regression from f0551af0213 ("x86/topology: Ignore
 non-present APIC IDs in a present package")

Lyude!

On Mon, May 13 2024 at 19:32, Lyude Paul wrote:
> Oh! I am not sure what changed, but I realized that you might also want to see
> the serial output from the debugging patch that you had sent me a while ago.
> So I just built that against the 6.9 kernel and it actually seems to boot
> without needing me to pass intremap=off. So it seems like that might actually
> be a fix!

Which one of the debug patches did you use?

>> Yes - it still boots. As well I finally got the serial console adapter in, but
>> I don't see any additional output:

That's fine, but now I can provide you debug patches which dump
information during early boot.

Can you please provide the output of 'cpuid -r' ?

Thanks,

        tglx