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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Paul Menzel <pmenzel@molgen.mpg.de>
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Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup
In-Reply-To: <8592a301-9933-1cad-bd61-8d97e7c7493b@molgen.mpg.de>
References: <20230414225551.858160935@linutronix.de>
 <8247ce4d-15b7-03b2-0c9b-74f8cd6cad50@molgen.mpg.de> <87wn2a4la5.ffs@tglx>
 <bd5a6a93-def1-9248-2258-c3d3b40071ef@molgen.mpg.de> <87ttxd4qxz.ffs@tglx>
 <87r0sh4m7a.ffs@tglx> <8592a301-9933-1cad-bd61-8d97e7c7493b@molgen.mpg.de>
Date:   Wed, 19 Apr 2023 11:38:21 +0200
Message-ID: <87a5z443g2.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
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Paul!

On Tue, Apr 18 2023 at 22:10, Paul Menzel wrote:
> Am 18.04.23 um 10:40 schrieb Thomas Gleixner:
>> Can you please provide the output of cpuid?
>
> Of course. Here the top, and the whole output is attached.

Thanks for the data. Can you please apply the debug patch below and
provide the dmesg output? Just the line which is added by the patch is
enough. You can boot with cpuhp.parallel=off so you don't have wait for
10 seconds.

Thanks,

        tglx
---
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -814,6 +814,7 @@ static int wakeup_secondary_cpu_via_init
 	unsigned long send_status = 0, accept_status = 0;
 	int maxlvt, num_starts, j;
 
+	pr_info("Kicking AP alive: %d\n", phys_apicid);
 	preempt_disable();
 	maxlvt = lapic_get_maxlvt();