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rcu: Directly drive RCU_USER_QS from Kconfig 

Currently, Kconfig will ask the user whether RCU_USER_QS should be set.
This is silly because Kconfig already has all the information that it
needs to set this parameter.  This commit therefore directly drives
the value of RCU_USER_QS via NO_HZ_FULL's "select" statement.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Paul E. McKenney 2015-04-20 06:17:15 -07:00
parent 82d0f4c089
commit 7db21edfec
1 changed files with 1 additions and 9 deletions
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10
init/Kconfig
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@ -529,9 +529,7 @@ config CONTEXT_TRACKING
bool bool
config RCU_USER_QS config RCU_USER_QS
bool "Consider userspace as in RCU extended quiescent state" bool
depends on HAVE_CONTEXT_TRACKING && SMP
select CONTEXT_TRACKING
help help
This option sets hooks on kernel / userspace boundaries and This option sets hooks on kernel / userspace boundaries and
puts RCU in extended quiescent state when the CPU runs in puts RCU in extended quiescent state when the CPU runs in
@ -539,12 +537,6 @@ config RCU_USER_QS
excluded from the global RCU state machine and thus doesn't excluded from the global RCU state machine and thus doesn't
try to keep the timer tick on for RCU. try to keep the timer tick on for RCU.
Unless you want to hack and help the development of the full
dynticks mode, you shouldn't enable this option. It also
adds unnecessary overhead.
If unsure say N
config CONTEXT_TRACKING_FORCE config CONTEXT_TRACKING_FORCE
bool "Force context tracking" bool "Force context tracking"
depends on CONTEXT_TRACKING depends on CONTEXT_TRACKING