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

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Message-ID: <20111024115624.GB2635@zhy>
Date:	Mon, 24 Oct 2011 19:56:24 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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, Oct 24, 2011 at 01:45:16PM +0200, Thomas Gleixner wrote:
> On Mon, 24 Oct 2011, Yong Zhang wrote:
> > On Mon, Oct 24, 2011 at 11:24:51AM +0200, Thomas Gleixner wrote:
> > > > 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.
> > 
> > If so, I think that kind of violation has been caught in mainline,
> > because mainline has had CPU_DOWN_PREPARE called under
> > cpu_hotplug.lock, right?
> > 
> > Or am I missing something?
> 
> Hmm, no. I obviously forgot that I moved it in RT :(
> 
> So yes, it should be safe. Though the question is why cpufreq does not
> suffer from that that problem in mainline.

By this one: peter_zijlstra-fix-cpufreq.patch

Thanks,
Yong
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