Message-ID: <1336577648.2498.9.camel@lorien2>
Subject: Re: [PATCH 1/5] Fix soft-lookup in stop machine on secondary cpu
 bring up
From: Shuah Khan <shuahkhan@gmail.com>
Reply-To: shuahkhan@gmail.com
To: Igor Mammedov <imammedo@redhat.com>
Cc: shuahkhan@gmail.com, linux-kernel@vger.kernel.org, rob@landley.net,
        tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org,
        luto@mit.edu, suresh.b.siddha@intel.com, avi@redhat.com,
        a.p.zijlstra@chello.nl, johnstul@us.ibm.com, arjan@linux.intel.com,
        linux-doc@vger.kernel.org
Date: Wed, 09 May 2012 09:34:08 -0600
In-Reply-To: <4FAA8BCC.5000704@redhat.com>
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	 <1336575858.2498.7.camel@lorien2> <4FAA8BCC.5000704@redhat.com>
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On Wed, 2012-05-09 at 17:22 +0200, Igor Mammedov wrote:
> 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)?
> 

I had to abandon the boot and go back to distro installed kernel - yes I
will test with your patch set and see if the problem goes away. Might
not happen until close to end of day today, but will report back.

-- Shuah


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