linux-kernel - Re: [RFC] [PATCH -rt 5/5] cpufreq: get rid of get_online_cpus()/put_online

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Message-ID: <alpine.LFD.2.02.1110241123190.2642@ionos>
Date:	Mon, 24 Oct 2011 11:24:51 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yong Zhang <yong.zhang0@...il.com>
cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [RFC] [PATCH -rt 5/5] cpufreq: get rid of
 get_online_cpus()/put_online_cpus()



On Mon, 24 Oct 2011, Yong Zhang wrote:

> On Wed, Oct 19, 2011 at 11:12:20AM +0200, Thomas Gleixner wrote:
> > On Sun, 16 Oct 2011, Yong Zhang wrote:
> > 
> > > Fix below false positive (seems this is not a real deadlock scenario)
> > > lockdep warning:
> > 
> > This looks like you caused it with patch 1.
> 
> Hmmm, yup.
> CPU_DOWN_PREPARE will be under cpu_hotplug.lock.
> 
> > Both need a bit more
> > thought, but thanks for catching that.
> 
> No sure whether it's big issue or not.
> Mind showing more about your concern?

This is probably not the only place which will run into that issue and
I have not much interest to patch all those sites.

Thanks,

	tglx
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