rcu: Allow TREE_PREEMPT_RCU on UP systems
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Tue, 8 Jan 2013 23:48:33 +0000 (15:48 -0800)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Tue, 29 Jan 2013 06:06:22 +0000 (22:06 -0800)
commit9fc52d832b5e7f6e175f3b20ae94504b780b9fd3
treece618667492e0d87b496dad1f605674bbb6a5bc4
parent6bfc09e2327dfbffc312004c16188dbf8dfb0297
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>
init/Kconfig