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rcu: Allow TREE_PREEMPT_RCU on UP systems

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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>
This commit is contained in:
Paul E. McKenney 2013-01-08 15:48:33 -08:00
parent 6bfc09e232
commit 9fc52d832b
1 changed files with 3 additions and 1 deletions
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4
init/Kconfig
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@ -453,7 +453,7 @@ config TREE_RCU
config TREE_PREEMPT_RCU config TREE_PREEMPT_RCU
bool "Preemptible tree-based hierarchical RCU" bool "Preemptible tree-based hierarchical RCU"
depends on PREEMPT && SMP depends on PREEMPT
help help
This option selects the RCU implementation that is This option selects the RCU implementation that is
designed for very large SMP systems with hundreds or designed for very large SMP systems with hundreds or
@ -461,6 +461,8 @@ config TREE_PREEMPT_RCU
is also required. It also scales down nicely to is also required. It also scales down nicely to
smaller systems. smaller systems.
Select this option if you are unsure.
config TINY_RCU config TINY_RCU
bool "UP-only small-memory-footprint RCU" bool "UP-only small-memory-footprint RCU"
depends on !PREEMPT && !SMP depends on !PREEMPT && !SMP