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rcu: Create RCU_EXPERT Kconfig and hide booleans behind it

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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>
This commit is contained in:
Paul E. McKenney 2015-04-20 12:19:45 -07:00
parent a3dc2948ce
commit 78cae10b3a
1 changed files with 17 additions and 2 deletions
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19
init/Kconfig
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@ -501,6 +501,21 @@ config TINY_RCU
endchoice 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 config SRCU
bool bool
help help
@ -613,7 +628,7 @@ config RCU_FANOUT_LEAF
config RCU_FAST_NO_HZ config RCU_FAST_NO_HZ
bool "Accelerate last non-dyntick-idle CPU's grace periods" 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 default n
help help
This option permits CPUs to enter dynticks-idle state even if This option permits CPUs to enter dynticks-idle state even if
@ -639,7 +654,7 @@ config TREE_RCU_TRACE
config RCU_BOOST config RCU_BOOST
bool "Enable RCU priority boosting" bool "Enable RCU priority boosting"
depends on RT_MUTEXES && PREEMPT_RCU depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
default n default n
help help
This option boosts the priority of preempted RCU readers that This option boosts the priority of preempted RCU readers that