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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-03-27 08:44:00 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-06-10 13:45:49 -0700
commit127781d1ba1ee5bbe1780afa35dd0e71583b143d (patch)
tree3c9b5961bc02e7f380a7bd7932181329ecbec397 /init
parentefc151c33b971148894789dc7c5589dec46d4348 (diff)
downloadlinux-127781d1ba1ee5bbe1780afa35dd0e71583b143d.tar.gz
rcu: Remove TINY_PREEMPT_RCU
TINY_PREEMPT_RCU adds significant code and complexity, but does not offer commensurate benefits. People currently using TINY_PREEMPT_RCU can get much better memory footprint with TINY_RCU, or, if they really need preemptible RCU, they can use TREE_PREEMPT_RCU with a relatively minor degradation in memory footprint. Please note that this move has been widely publicized on LKML (https://lkml.org/lkml/2012/11/12/545) and on LWN (http://lwn.net/Articles/541037/). This commit therefore removes TINY_PREEMPT_RCU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: Updated to eliminate #else in rcutiny.h as suggested by Josh ] Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig10
1 files changed, 1 insertions, 9 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 2d9b83104dc..e7fb255413d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -459,18 +459,10 @@ config TINY_RCU
is not required. This option greatly reduces the
memory footprint of RCU.
-config TINY_PREEMPT_RCU
- bool "Preemptible UP-only small-memory-footprint RCU"
- depends on PREEMPT && !SMP
- help
- This option selects the RCU implementation that is designed
- for real-time UP systems. This option greatly reduces the
- memory footprint of RCU.
-
endchoice
config PREEMPT_RCU
- def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU )
+ def_bool TREE_PREEMPT_RCU
help
This option enables preemptible-RCU code that is common between
the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations.