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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-11-03 14:56:12 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-12-11 10:31:45 -0800
commitb807fbff3102bcac76ed9157d834dc20bb3d133b (patch)
treea47a67bc636debb60b58ef1859d5282ebec244cd /init/Kconfig
parent11dbaa8cb79a6e4a234a134898436f717a663f01 (diff)
downloadlinux-linaro-stable-b807fbff3102bcac76ed9157d834dc20bb3d133b.tar.gz
rcu: Permit RCU_FAST_NO_HZ to be used by TREE_PREEMPT_RCU
The new implementation of RCU_FAST_NO_HZ is compatible with preemptible RCU, so this commit removes the Kconfig restriction that previously prohibited this. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'init/Kconfig')
-rw-r--r--init/Kconfig10
1 files changed, 5 insertions, 5 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 43298f9810fb..82b6a4c675b2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -469,14 +469,14 @@ config RCU_FANOUT_EXACT
config RCU_FAST_NO_HZ
bool "Accelerate last non-dyntick-idle CPU's grace periods"
- depends on TREE_RCU && NO_HZ && SMP
+ depends on NO_HZ && SMP
default n
help
This option causes RCU to attempt to accelerate grace periods
- in order to allow the final CPU to enter dynticks-idle state
- more quickly. On the other hand, this option increases the
- overhead of the dynticks-idle checking, particularly on systems
- with large numbers of CPUs.
+ in order to allow CPUs to enter dynticks-idle state more
+ quickly. On the other hand, this option increases the overhead
+ of the dynticks-idle checking, particularly on systems with
+ large numbers of CPUs.
Say Y if energy efficiency is critically important, particularly
if you have relatively few CPUs.