linux-kernel - Is this code chunk in init_apic

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Message-ID: <978293b9-8e9f-55f6-6ec4-e2d66c4db0de@cn.fujitsu.com>
Date:   Thu, 5 Mar 2020 20:44:24 +0800
From:   Cao jin <caoj.fnst@...fujitsu.com>
To:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Subject: Is this code chunk in init_apic_mappings() superfluous?

Hi,

I am trying to figure the following code chunk out:

	if (x2apic_mode) {
		boot_cpu_physical_apicid = read_apic_id();
		return;
	}

As my understanding, even in x2APIC mode, boot_cpu_physical_apicid is
also got via early_acpi_process_madt --> ... --> register_lapic_address,
so, is it for any corner case I am not aware?
-- 
Sincerely,
Cao jin