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From: Yong Zhang <yong.zhang0@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: Re: [RFC] [PATCH -rt 5/5] cpufreq: get rid of get_online_cpus()/put_online_cpus()
Date: Mon, 24 Oct 2011 19:30:56 +0800	[thread overview]
Message-ID: <20111024113056.GA2635@zhy> (raw)
In-Reply-To: <alpine.LFD.2.02.1110241123190.2642@ionos>

On Mon, Oct 24, 2011 at 11:24:51AM +0200, Thomas Gleixner wrote:
> 
> 
> 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.

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?

Thanks,
Yong

  reply	other threads:[~2011-10-24 11:30 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-16 10:56 [RFC] [PATCH -rt 0/5] patchset focusing on cpu hotplug Yong Zhang
2011-10-16 10:56 ` [PATCH -rt 1/5] hotplug: sync_unplug: No '\n' in task name Yong Zhang
2011-10-16 10:56 ` [PATCH -rt 2/5] hotplug: Call cpu_unplug_begin() a little early Yong Zhang
2011-10-16 10:56 ` [RFC] [PATCH -rt 3/5] printk: don't call printk_tick in printk_needs_cpu() Yong Zhang
2011-10-16 10:56 ` [PATCH -rt 4/5] workqueue: hotplug fix Yong Zhang
2011-10-19  7:14   ` Thomas Gleixner
2011-10-24  2:26     ` Yong Zhang
2011-10-24  9:25       ` Thomas Gleixner
2011-10-16 10:56 ` [RFC] [PATCH -rt 5/5] cpufreq: get rid of get_online_cpus()/put_online_cpus() Yong Zhang
2011-10-19  9:12   ` Thomas Gleixner
2011-10-24  2:44     ` Yong Zhang
2011-10-24  9:24       ` Thomas Gleixner
2011-10-24 11:30         ` Yong Zhang [this message]
2011-10-24 11:45           ` Thomas Gleixner
2011-10-24 11:56             ` Yong Zhang

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