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Message-ID: <20140206184103.GA31410@redhat.com> Date: Thu, 6 Feb 2014 19:41:03 +0100 From: Oleg Nesterov <oleg@...hat.com> To: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> Cc: paulus@...ba.org, rusty@...tcorp.com.au, peterz@...radead.org, tglx@...utronix.de, akpm@...ux-foundation.org, mingo@...nel.org, paulmck@...ux.vnet.ibm.com, tj@...nel.org, walken@...gle.com, ego@...ux.vnet.ibm.com, linux@....linux.org.uk, linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@...com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com> 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. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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