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Subject: Re: [RFC][PATCH 15/26] sched, numa: Implement hotplug hooks
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 19 Mar 2012 13:19:58 +0100
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To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, Paul Turner <pjt@google.com>, Suresh Siddha <suresh.b.siddha@intel.com>, Mike Galbraith <efault@gmx.de>, "Paul E.
 McKenney" <paulmck@linux.vnet.ibm.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Dan Smith <danms@us.ibm.com>, Bharata B Rao <bharata.rao@gmail.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Andrea Arcangeli <aarcange@redhat.com>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org

On Mon, 2012-03-19 at 17:46 +0530, Srivatsa S. Bhat wrote:
> > +     get_online_cpus();
> > +     cpu_notifier(numa_hotplug, 0);
>=20
>=20
> ABBA deadlock!
>=20
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.

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