linux-kernel - Re: [RFC][PATCH 15/26] sched, numa: Implement hotplug hooks

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Date:	Mon, 19 Mar 2012 17:57:22 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 15/26] sched, numa: Implement hotplug hooks

On 03/19/2012 05:49 PM, Peter Zijlstra wrote:

> On Mon, 2012-03-19 at 17:46 +0530, Srivatsa S. Bhat wrote:
>>> +     get_online_cpus();
>>> +     cpu_notifier(numa_hotplug, 0);
>>
>>
>> ABBA deadlock!
>>
> Yeah, I know.. luckily it can't actually happen since early_initcalls
> are pre-smp. I could just leave out the get_online_cpus() thing.
> 


Oh numa_init() is an early_initcall? Ok, I didn't observe.
In that case, its fine either way, with or without get_online_cpus()
stuff.

Regards,
Srivatsa S. Bhat

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