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

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Message-ID: <57f93c84-aeb3-faa5-074b-fb88d1ae5d4f@cn.fujitsu.com>
Date:   Mon, 4 Dec 2017 11:28:50 +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,

[...]
>>
>> 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. :-)
> 
> IIRC the last thing in the log is the "Hierarchical SRCU implementation."
> line, after which the CPU seems to start spinning somewhere (the fan turns
> on pretty quickly). Where exactly it spins, I don't know at this time.
> 

Yes, I see. Sometimes, positioning the source of a problem is difficult.

Seems initcalls have been executed, we can add "initcall_debug" option
in the kernel command line for tracing initcalls as they are executed.

So, we can make this patch more reasonable.

Thanks
	dou