linux-kernel - Re: INFO: possible recursive locking detected: get_partial

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Date:	Fri, 11 Nov 2011 08:57:19 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Yong Zhang <yong.zhang0@...il.com>
cc:	Shaohua Li <shaohua.li@...el.com>,
	Julie Sullivan <kernelmail.jms@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: INFO: possible recursive locking detected: get_partial_node()
 on 3.2-rc1

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.
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