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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-04-20 14:27:43 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-27 12:59:05 -0700 |
| commit | 05c5df31afd1092ca6322094d22aff6351fa67fe (patch) | |
| tree | dffce93d8da097a4701bfdafe4c23323371cd899 /init | |
| parent | 8739c5cb0fb145aeed8c56ddb5ba79381c74cb97 (diff) | |
| download | linux-05c5df31afd1092ca6322094d22aff6351fa67fe.tar.gz linux-05c5df31afd1092ca6322094d22aff6351fa67fe.tar.bz2 linux-05c5df31afd1092ca6322094d22aff6351fa67fe.zip | |
rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT
This commit introduces an RCU_FANOUT C-preprocessor macro so that RCU will
build even when CONFIG_RCU_FANOUT is undefined. The RCU_FANOUT macro is
set to the value of CONFIG_RCU_FANOUT when defined, otherwise it is set
to 32 for 32-bit systems and 64 for 64-bit systems. This commit then
makes CONFIG_RCU_FANOUT depend on CONFIG_RCU_EXPERT, so that Kconfig
users won't be asked about CONFIG_RCU_FANOUT unless they want to be.
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>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig index ac5386937d37..fd2d4fb517ca 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -583,7 +583,7 @@ config RCU_FANOUT int "Tree-based hierarchical RCU fanout value" range 2 64 if 64BIT range 2 32 if !64BIT - depends on TREE_RCU || PREEMPT_RCU + depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT default 64 if 64BIT default 32 if !64BIT help |