From 05c5df31afd1092ca6322094d22aff6351fa67fe Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 20 Apr 2015 14:27:43 -0700 Subject: 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 Signed-off-by: Paul E. McKenney Reviewed-by: Pranith Kumar --- init/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'init/Kconfig') 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 -- cgit v1.2.3