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From: Thomas Gleixner <tglx@linutronix.de>
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To: Chris Lindee <chris.lindee@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>, regressions@lists.linux.dev, Ingo Molnar
 <mingo@redhat.com>, Dave Hansen <dave.hansen@linux.intel.com>,
 x86@kernel.org, "Peter Zijlstra (Intel)" <peterz@infradead.org>, Ashok Raj
 <ashok.raj@intel.com>, David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: [REGRESSION] x86/smpboot/64: System will not boot on v6.5,
 v6.7-rc4
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Date: Wed, 13 Dec 2023 22:08:57 +0100
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On Wed, Dec 13 2023 at 15:34, Thomas Gleixner wrote:
> On Tue, Dec 12 2023 at 13:11, Chris Lindee wrote:
> Though that does not really explain why the parallel bringup goes south
> as that is not really different from what the serialized bringup is
> doing in terms of kicking the APs into life.
>
> Can you try and add "ignore_loglevel earlyprintk=ttyS0,115200n8" to the
> kernel command line and capture dmesg on the serial port when booting
> with the parallel hotplug enabled?

Don't bother it wont tell us much and I decoded the issue already. Will
send a patch tomorrow.