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Date: Fri, 11 Nov 2011 08:57:19 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
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To: Yong Zhang <yong.zhang0@gmail.com>
cc: Shaohua Li <shaohua.li@intel.com>,
        Julie Sullivan <kernelmail.jms@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Pekka Enberg <penberg@kernel.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: INFO: possible recursive locking detected: get_partial_node()
 on 3.2-rc1
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References: <20111109090556.GA5949@zhy> <201111102335.06046.kernelmail.jms@gmail.com> <1320980671.22361.252.camel@sli10-conroe> <20111111044202.GA21013@zhy>
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Looks like a false positive.

put_cpu_partial() can be called with a parameter to indicate if draining
of the per cpu partial list should be allowed ("drain"). Draining requires
taking the list lock. "drain" is set to 0 when called from
get_partial_node() (where we are already holding the list lock) so no
deadlock should be possible.