linux-kernel - Re: [RFC PATCH 1/3] cpu-hotplug: Refcount Based Cpu Hotplug implementation

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Date:	Thu, 15 Nov 2007 16:25:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Rusty Russel <rusty@...tcorp.com.au>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Paul E McKenney <paulmck@...ibm.com>,
	Richard Gooch <rgooch@...f.csiro.au>,
	Tigran Aivazian <tigran@...azian.fs.co.uk>,
	Shoahua Li <shaohua.li@...ux.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Nathan Lynch <ntl@...ox.com>, Paul Jackson <pj@....com>,
	Christoph Lameter <clameter@....com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Akinobu Mita <akinobu.mita@...il.com>
Subject: Re: [RFC PATCH 1/3] cpu-hotplug: Refcount Based Cpu Hotplug
	implementation


* Ingo Molnar <mingo@...e.hu> wrote:

> * Gautham R Shenoy <ego@...ibm.com> wrote:
> 
> >  void lock_cpu_hotplug(void)
> >  {
> > -	struct task_struct *tsk = current;
> > -
> > -	if (tsk == recursive) {
> > -		static int warnings = 10;
> > -		if (warnings) {
> > -			printk(KERN_ERR "Lukewarm IQ detected in hotplug locking\n");
> > -			WARN_ON(1);
> > -			warnings--;
> > -		}
> > -		recursive_depth++;
> 
> i nominate it for a 2.6.24 merge due to it fixing the above 
> regression. I've seen regular instances of the "Lukewarm IQ" message.

FYI, i've put these 3 patches into the scheduler git tree and it's 
looking very good so far. So unless Andrew or Linus objects to put this 
into v2.6.24, or there's serious questions during review, could we merge 
it this way?

	Ingo
-
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