The difference between x86_cpu_to_apicid and x86_bios_cpu_apicid

From	Baoquan He <bhe@redhat.com>
Newsgroups	linux.kernel
Subject	The difference between x86_cpu_to_apicid and x86_bios_cpu_apicid
Date	2016-06-18 10:30 +0200
Message-ID	<rLjNE-1CT-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi Thomas,

Sorry to bother you. I am always wondering what's the difference between
x86_cpu_to_apicid and x86_bios_cpu_apicid. Or in other words, I don't
know why x86_bios_cpu_apicid is required. From code both
x86_cpu_to_apicid and x86_bios_cpu_apicid stores the apicid correspond
to a certain logic cpu number. With my understanding x86_cpu_to_apicid
can do what x86_bios_cpu_apicid is doing except for its usage in below
commit.

commit 1f12e32f4cd5243ae46d8b933181be0d022c6793
Author: Thomas Gleixner <tglx@linutronix.de>
Date:   Mon Feb 22 22:19:15 2016 +0000

    x86/topology: Create logical package id

Could you please help to explain when it's convenient to you?

Thanks
Baoquan

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The difference between x86_cpu_to_apicid and x86_bios_cpu_apicid Baoquan He <bhe@redhat.com> - 2016-06-18 10:30 +0200

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