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

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Date:	Thu, 15 Nov 2007 15:15:01 +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


* 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.

	Ingo
-
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