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Date:   Fri, 16 Jun 2023 11:42:05 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     "Zhang, Rui" <rui.zhang@intel.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "bp@alien8.de" <bp@alien8.de>,
        "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
        "Tang, Feng" <feng.tang@intel.com>,
        "Chen, Tim C" <tim.c.chen@intel.com>,
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        "x86@kernel.org" <x86@kernel.org>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "paulmck@kernel.org" <paulmck@kernel.org>,
        "Woodhouse, David" <dwmw@amazon.co.uk>
Subject: Re: [Patch v2 2/2] x86/tsc: use logical_packages as a better
 estimation of socket numbers
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On Fri, Jun 16, 2023 at 09:19:18AM +0000, Zhang, Rui wrote:

> According to the MADT, there are indeed 40 valid CPUs. And then 80 CPUs
> with 
> 
> APIC ID		: FF
> enabled		: 0
> Online capable	: 0
> 
> a dumb question, why are these CPUs added into the possible_mask?
> I can dig into this later but I just don't have a quick answer at the
> moment.

I really don't know.. I've not gotten around to reading that part of the
x86 code yet.