linux-kernel - Re: [PATCH 3/5] x86, acpi, cpu-hotplug: Introduce apicid_to_cpuid[] array to store persistent cpuid <-> apicid mapping.

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Message-ID: <55A5FD04.1090003@cn.fujitsu.com>
Date:	Wed, 15 Jul 2015 14:26:12 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Mika Penttilä <mika.j.penttila@...il.com>
CC:	<rjw@...ysocki.net>, <gongzhaogang@...pur.com>, <x86@...nel.org>,
	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: Re: [PATCH 3/5] x86, acpi, cpu-hotplug: Introduce apicid_to_cpuid[]
 array to store persistent cpuid <-> apicid mapping.


On 07/15/2015 01:35 PM, Jiang Liu wrote:
> On 2015/7/15 11:33, Tang Chen wrote:
>> Hi Mika,
>>
>> On 07/07/2015 07:14 PM, Mika Penttilä wrote:
>>> I think you forgot to reserve CPU 0 for BSP in cpuid mask.
>> Sorry for the late reply.
>>
>> I'm not familiar with BSP.  Do you mean in get_cpuid(),
>> I should reserve 0 for physical cpu0 in BSP ?
>>
>> Would you please share more detail ?
> BSP stands for "Bootstrapping Processor". In other word,
> BSP is CPU0.
> .
>

Ha, how foolish I am.

And yes, cpu0 is not reserved when apicid == boot_cpu_physical_apicid
comes true.

Will update the patch.

Thanks. :)
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