linux-kernel - Re: [PATCH] Revert "x86/apic: Remove init_bsp

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Date:   Thu, 30 Nov 2017 14:28:18 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
CC:     <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>, <yinghai@...nel.org>,
        <bhe@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] Revert "x86/apic: Remove init_bsp_APIC()"

Hi, Ville

At 11/30/2017 05:25 AM, Ville Syrjälä wrote:
> On Wed, Nov 29, 2017 at 09:15:19AM +0800, Dou Liyang wrote:
>> Hi Ville,
>>
>> At 11/28/2017 10:53 PM, Ville Syrjala wrote:
>>> From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
>>>
>>> This reverts commit b371ae0d4a194b178817b0edfb6a7395c7aec37a.
>>>
>>> Causes my P3 UP machine to hang at boot with "lapic".
>>>
>>> Cc: Dou Liyang <douly.fnst@...fujitsu.com>
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> Cc: yinghai@...nel.org
>>> Cc: bhe@...hat.com
>>> Cc: Ingo Molnar <mingo@...hat.com>
>>> Cc: "H. Peter Anvin" <hpa@...or.com>
>>> Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
>>> ---
>>
>> Could you give me the dmesg log of your P3 UP machine?
>
> This is with the revert:

Oops, Sorry about my ambiguous description, I knew the revert patch
could work.

Actually, It's an interesting problem. your machine (UP system without
ACPI table and MP table) will make the interrupt mode in a rare
situation:

   Virtual Wire Mode with no configuration

My test cases also simulate this situation, can work well. I hope to
know why you machine hang?

So, the true thing I want to get is the log without the revert.
or could you tell me the phenomenon and reason of your machine hang
directly. :-)

Thanks,
	dou