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Subject[PATCH tip/core/rcu 09/12] rcu: Break dependency of RCU_FANOUT_LEAF on RCU_FANOUT
From: "Paul E. McKenney" <>

RCU_FANOUT_LEAF's range and default values depend on the value of
RCU_FANOUT, which at the time seemed like a cute way to save two lines
of Kconfig code. However, adding a dependency from both of these
Kconfig parameters on RCU_EXPERT requires that RCU_FANOUT_LEAF operate
correctly even if RCU_FANOUT is undefined. This commit therefore
allows RCU_FANOUT_LEAF to take on the full range of permitted values,
even in cases where RCU_FANOUT is undefined.

Signed-off-by: Paul E. McKenney <>
init/Kconfig | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index aa68d72fe051..35559e07db18 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -599,9 +599,11 @@ config RCU_FANOUT

int "Tree-based hierarchical RCU leaf-level fanout value"
- range 2 RCU_FANOUT if 64BIT
- range 2 RCU_FANOUT if !64BIT
+ range 2 64 if 64BIT
+ range 2 32 if !64BIT
depends on TREE_RCU || PREEMPT_RCU
+ default 64 if 64BIT
+ default 32 if !64BIT
default 16
This option controls the leaf-level fanout of hierarchical

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