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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-06-23 17:12:47 -0700
committerIngo Molnar <mingo@elte.hu>2009-06-24 15:05:13 +0200
commitc17ef45342cc033fdf7bdd5b28615e0090f8d2e7 (patch)
tree6bb4b1d09f0801d5e3ad5a727e14035090b25931 /init
parentf6faac71d502be1c29c81b2f45657662c3b84470 (diff)
downloadlinux-linaro-stable-c17ef45342cc033fdf7bdd5b28615e0090f8d2e7.tar.gz
rcu: Remove Classic RCU
Remove Classic RCU, given that the combination of Tree RCU and the proposed Bloatwatch RCU do everything that Classic RCU can with fewer bugs. Tree RCU has been default in x86 builds for almost six months, and seems to be quite reliable, so there does not seem to be much justification for keeping the Classic RCU code and config complexity around anymore. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com> Cc: akpm@linux-foundation.org Cc: niv@us.ibm.com Cc: dvhltc@us.ibm.com Cc: dipankar@in.ibm.com Cc: dhowells@redhat.com Cc: lethal@linux-sh.org Cc: kernel@wantstofly.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig12
1 files changed, 2 insertions, 10 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 1ce05a4cb5f6..d10f31dfa0b2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -316,21 +316,13 @@ choice
prompt "RCU Implementation"
default TREE_RCU
-config CLASSIC_RCU
- bool "Classic RCU"
- help
- This option selects the classic RCU implementation that is
- designed for best read-side performance on non-realtime
- systems.
-
- Select this option if you are unsure.
-
config TREE_RCU
bool "Tree-based hierarchical RCU"
help
This option selects the RCU implementation that is
designed for very large SMP system with hundreds or
- thousands of CPUs.
+ thousands of CPUs. It also scales down nicely to
+ smaller systems.
config PREEMPT_RCU
bool "Preemptible RCU"