linux-kernel - Re: [PATCH v7 18/24] init/main: Delay initialization of the lockup detector after smp

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Message-ID: <871pj14xnr.ffs@tglx>
Date: Tue, 03 Feb 2026 17:08:56 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>, Tony Luck
 <tony.luck@...el.com>, Dave Hansen <dave.hansen@...el.com>, "Rafael J.
 Wysocki" <rafael.j.wysocki@...el.com>, Reinette Chatre
 <reinette.chatre@...el.com>, Dan Williams <dan.j.williams@...el.com>
Cc: Andi Kleen <ak@...ux.intel.com>, Stephane Eranian <eranian@...gle.com>,
 Ricardo Neri <ricardo.neri@...el.com>, linux-kernel@...r.kernel.org,
 Alexander Graf <graf@...zon.com>
Subject: Re: [PATCH v7 18/24] init/main: Delay initialization of the lockup
 detector after smp_init()

On Wed, Mar 01 2023 at 15:47, Ricardo Neri wrote:
> Certain implementations of the hardlockup detector require support for
> Inter-Processor Interrupt shorthands. On x86, support for these can only
> be determined after all the possible CPUs have booted once (in smp_init()).
> Other architectures may not need such check.

Looking at this with a completely rebooted brain, I think this is not
required at all when the HPET watchdog mechanics to propagate the
watchdog NMI are done differently. I'll comment on that in the related
patch.

Thanks,

        tglx