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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-04-20 12:19:45 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-27 12:59:04 -0700
commit78cae10b3a90438689f8cedb66241ce9cff9c214 (patch)
tree193a925f99d4a95cf0bc87d1700c830b1b29d999 /init
parenta3dc2948cec80f20a89e9b646d0c01b121e48e02 (diff)
downloadlinux-linaro-stable-78cae10b3a90438689f8cedb66241ce9cff9c214.tar.gz
rcu: Create RCU_EXPERT Kconfig and hide booleans behind it
This commit creates an RCU_EXPERT Kconfig and hides the independent boolean RCU-related user-visible Kconfig parameters behind it, namely RCU_FAST_NO_HZ and RCU_BOOST. This prevents Kconfig from asking about these parameters unless the user really wants to be asked. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig19
1 files changed, 17 insertions, 2 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 0ec82362cfc0..7eb4c7b3543c 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -501,6 +501,21 @@ config TINY_RCU
endchoice
+config RCU_EXPERT
+ bool "Make expert-level adjustments to RCU configuration"
+ default n
+ help
+ This option needs to be enabled if you wish to make
+ expert-level adjustments to RCU configuration. By default,
+ no such adjustments can be made, which has the often-beneficial
+ side-effect of preventing "make oldconfig" from asking you all
+ sorts of detailed questions about how you would like numerous
+ obscure RCU options to be set up.
+
+ Say Y if you need to make expert-level adjustments to RCU.
+
+ Say N if you are unsure.
+
config SRCU
bool
help
@@ -613,7 +628,7 @@ config RCU_FANOUT_LEAF
config RCU_FAST_NO_HZ
bool "Accelerate last non-dyntick-idle CPU's grace periods"
- depends on NO_HZ_COMMON && SMP
+ depends on NO_HZ_COMMON && SMP && RCU_EXPERT
default n
help
This option permits CPUs to enter dynticks-idle state even if
@@ -639,7 +654,7 @@ config TREE_RCU_TRACE
config RCU_BOOST
bool "Enable RCU priority boosting"
- depends on RT_MUTEXES && PREEMPT_RCU
+ depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
default n
help
This option boosts the priority of preempted RCU readers that