linux-kernel - Re: [PATCH] x86/tsc: Use topology_max

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Date: Sun, 17 Mar 2024 22:03:38 -0400
From: Waiman Long <longman@...hat.com>
To: Feng Tang <feng.tang@...el.com>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...el.com>, "H . Peter Anvin" <hpa@...or.com>,
 Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, paulmck@...nel.org,
 rui.zhang@...el.com, linux-kernel@...r.kernel.org
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH] x86/tsc: Use topology_max_packages() to get package
 number

On 3/15/24 07:26, Feng Tang wrote:
> Commit b50db7095fe0 ("x86/tsc: Disable clocksource watchdog for TSC
> on qualified platorms") was introduced to solve problem that
> sometimes TSC clocksource is wrongly judged as unstable by watchdog
> like 'jiffies', HPET, etc.
>
> In it, the hardware package number is a key factor for judging whether
> to disable the watchdog for TSC, and 'nr_online_nodes' was chosen as
> an estimation due to it is needed in early boot phase before
> registering 'tsc-early' clocksource, where all none-boot CPUs are not

"none-boot"? You mean "non-boot". Right?

Other than that, the patch looks reasonable to me.

Thanks,
Longman