linux-kernel - Re: Kernel 6.9 regression: X86: Bogus messages from topology detection

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Date: Fri, 31 May 2024 13:06:50 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Christian Heusel <christian@...sel.eu>
Cc: Peter Schneider <pschneider1968@...glemail.com>, LKML
 <linux-kernel@...r.kernel.org>, x86@...nel.org, stable@...r.kernel.org,
 regressions@...ts.linux.dev
Subject: Re: Kernel 6.9 regression: X86: Bogus messages from topology detection

On Fri, May 31 2024 at 10:16, Christian Heusel wrote:
> On 24/05/31 10:13AM, Christian Heusel wrote:
> [    0.046127] TSC deadline timer available
> [    0.046129] CPU topo: Max. logical packages:   1
> [    0.046129] CPU topo: Max. logical dies:       1
> [    0.046129] CPU topo: Max. dies per package:   1
> [    0.046131] CPU topo: Max. threads per core:   2
> [    0.046132] CPU topo: Num. cores per package:    10
> [    0.046132] CPU topo: Num. threads per package:  12
> [    0.046132] CPU topo: Allowing 12 present CPUs plus 0 hotplug CPUs

This looks correct.

> [    0.117308] smpboot: x86: Booting SMP configuration:
> [    0.117308] .... node  #0, CPUs:        #2  #4  #5  #6  #7  #8  #9 #10 #11
> [    0.009676] [Firmware Bug]: CPU4: Topology domain 1 shift 7 != 6

So this means that the E-Cores have a different topology information for
the CORE shift value than the P-Cores which is definitely wrong.

Let's see what cpuid -r reports.

Thanks,

        tglx