linux-kernel - Re: [PATCH 1/5] Fix soft-lookup in stop machine on secondary cpu bring up

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Date:	Wed, 09 May 2012 17:22:52 +0200
From:	Igor Mammedov <imammedo@...hat.com>
To:	shuahkhan@...il.com
CC:	linux-kernel@...r.kernel.org, rob@...dley.net, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org, luto@....edu,
	suresh.b.siddha@...el.com, avi@...hat.com, a.p.zijlstra@...llo.nl,
	johnstul@...ibm.com, arjan@...ux.intel.com,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/5] Fix soft-lookup in stop machine on secondary cpu
 bring up

On 05/09/2012 05:04 PM, Shuah Khan wrote:
> On Wed, 2012-05-09 at 12:24 +0200, Igor Mammedov wrote:
>> When bringing up cpuX1, it could stall in start_secondary
>> before setting cpu_callin_mask for more than 5 sec. That forces
>> do_boot_cpu() to give up on waiting and go to error return path
>> printing messages:
>>    pr_err("CPU%d: Stuck ??\n", cpuX1);
>
> I am seeing this with the linux-next May 7th build on my laptop HP
> EliteBook 8440p during boot. Could this problem be not specific to virt
> envs.? Anybody else seeing it?

I could only guess that on bare metal SMI or other firmware issue may interfere with AP boot.
Could you test if this patch-set fixes issue for you?
And do you see the same problem during suspend/resume (assuming that it's booted without problem)?

-- 
-----
  Igor
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