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Subject: Re: [PATCH] Revert "x86/apic: Remove init_bsp_APIC()"
To:     =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>
References: <20171128145350.21560-1-ville.syrjala@linux.intel.com>
 <2d6301d5-5ac4-48e1-a682-f70c67a16cb8@cn.fujitsu.com>
 <20171129212524.GD10981@intel.com>
CC:     <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, <yinghai@kernel.org>,
        <bhe@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>
From:   Dou Liyang <douly.fnst@cn.fujitsu.com>
Message-ID: <0b26503d-b049-0b44-cb8b-c59ec1a78658@cn.fujitsu.com>
Date:   Thu, 30 Nov 2017 14:28:18 +0800
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Hi, Ville

At 11/30/2017 05:25 AM, Ville Syrj�l� 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 Syrj�l� <ville.syrjala@linux.intel.com>
>>>
>>> This reverts commit b371ae0d4a194b178817b0edfb6a7395c7aec37a.
>>>
>>> Causes my P3 UP machine to hang at boot with "lapic".
>>>
>>> Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
>>> Cc: Thomas Gleixner <tglx@linutronix.de>
>>> Cc: yinghai@kernel.org
>>> Cc: bhe@redhat.com
>>> Cc: Ingo Molnar <mingo@redhat.com>
>>> Cc: "H. Peter Anvin" <hpa@zytor.com>
>>> Signed-off-by: Ville Syrj�l� <ville.syrjala@linux.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


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