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Date:	Thu, 6 Feb 2014 19:41:03 +0100
From:	Oleg Nesterov <>
To:	"Srivatsa S. Bhat" <>
Cc:,,,,,,,,,,,, Toshi Kani <>,
	"Rafael J. Wysocki" <>
Subject: Re: [PATCH 01/51] CPU hotplug: Provide lockless versions of
	callback registration functions

On 02/06, Srivatsa S. Bhat wrote:
> The following method of CPU hotplug callback registration is not safe
> due to the possibility of an ABBA deadlock involving the cpu_add_remove_lock
> and the cpu_hotplug.lock.

Off-topic, but perhaps it also makes sense to add the lockdep annotations
later, to catch other similar problems. Currently get_online_cpus() acquires
nothing from lockdep pov.

As for the this patch/series, personally I agree.


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