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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-06-08 16:31:33 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-09-28 21:36:45 -0700
commit8008e129dc90ff4f7a56cb033d6bd042afe3ed52 (patch)
treeb9ecf70a2fe6eb1f64368ada9f45af62f0cae519 /init/Kconfig
parentb15a2e7d16cc6f6082d8c6a85349e48588763ffc (diff)
downloadlinux-linaro-stable-8008e129dc90ff4f7a56cb033d6bd042afe3ed52.tar.gz
rcu: Drive configuration directly from SMP and PREEMPT
This commit eliminates the possibility of running TREE_PREEMPT_RCU when SMP=n and of running TINY_RCU when PREEMPT=y. People who really want these combinations can hand-edit init/Kconfig, but eliminating them as choices for production systems reduces the amount of testing required. It will also allow cutting out a few #ifdefs. Note that running TREE_RCU and TINY_RCU on single-CPU systems using SMP-built kernels is still supported. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'init/Kconfig')
-rw-r--r--init/Kconfig6
1 files changed, 3 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig
index d62778390e55..dc7e27bf89a8 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -391,7 +391,7 @@ config TREE_RCU
config TREE_PREEMPT_RCU
bool "Preemptible tree-based hierarchical RCU"
- depends on PREEMPT
+ depends on PREEMPT && SMP
help
This option selects the RCU implementation that is
designed for very large SMP systems with hundreds or
@@ -401,7 +401,7 @@ config TREE_PREEMPT_RCU
config TINY_RCU
bool "UP-only small-memory-footprint RCU"
- depends on !SMP
+ depends on !PREEMPT && !SMP
help
This option selects the RCU implementation that is
designed for UP systems from which real-time response
@@ -410,7 +410,7 @@ config TINY_RCU
config TINY_PREEMPT_RCU
bool "Preemptible UP-only small-memory-footprint RCU"
- depends on !SMP && PREEMPT
+ depends on PREEMPT && !SMP
help
This option selects the RCU implementation that is designed
for real-time UP systems. This option greatly reduces the