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 09:04:18 -0600
From:	Shuah Khan <shuahkhan@...il.com>
To:	Igor Mammedov <imammedo@...hat.com>
Cc:	shuahkhan@...il.com, 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 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?

-- Shuah


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