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Date: Mon, 26 Sep 2016 13:52:08 -0400 (EDT)
From: Thomas Gleixner <tglx@linutronix.de>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
        Borislav Petkov <bp@alien8.de>, Dou Liyang <douly.fnst@cn.fujitsu.com>
Subject: Re: [x86-tip] strange nr_cpus= boot regression
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Mike,

On Mon, 26 Sep 2016, Thomas Gleixner wrote:
> On Mon, 26 Sep 2016, Mike Galbraith wrote:
> 
> > I've encountered a strange regression in tip, symptom is that if you
> > boot with nr_cpus=nr_you_have, what actually boots is nr_you_have/2. 
> >  Do not pass nr_cpus=, and all is well. 
> 
> What's the number of possible cpus in your system?

Can you please provide your .config and the dmesg of a bad and a good run?
  
Thanks,

	tglx