From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 8 Jan 2013 23:48:33 +0000 (-0800)
Subject: rcu: Allow TREE_PREEMPT_RCU on UP systems
X-Git-Tag: v3.9-rc1~175^2~2^2^4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9fc52d832b5e7f6e175f3b20ae94504b780b9fd3;p=pandora-kernel.git

rcu: Allow TREE_PREEMPT_RCU on UP systems

The TINY_PREEMPT_RCU is complex, does not provide that much memory
savings, and therefore TREE_PREEMPT_RCU should be used instead.  The
systems where the difference between TINY_PREEMPT_RCU and TREE_PREEMPT_RCU
are quite small compared to the memory footprint of CONFIG_PREEMPT.

This commit therefore takes a first step towards eliminating
TINY_PREEMPT_RCU by allowing TREE_PREEMPT_RCU to be configured on !SMP
systems.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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