documentation: Add pointer to percpu-ref for RCU and refcount
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Mon, 23 Jun 2014 18:52:59 +0000 (11:52 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Tue, 8 Jul 2014 15:32:56 +0000 (08:32 -0700)
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>

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