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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-04-21 09:12:13 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-27 12:59:05 -0700 |
| commit | 47d631af58bb9b2f2dd3d0da8c98a79a5e75c738 (patch) | |
| tree | 7472330c70684ac02140d2f3796b042b53a4f6dd /init | |
| parent | 05c5df31afd1092ca6322094d22aff6351fa67fe (diff) | |
| download | lwn-47d631af58bb9b2f2dd3d0da8c98a79a5e75c738.tar.gz lwn-47d631af58bb9b2f2dd3d0da8c98a79a5e75c738.zip | |
rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT_LEAF
This commit introduces an RCU_FANOUT_LEAF C-preprocessor macro so
that RCU will build even when CONFIG_RCU_FANOUT_LEAF is undefined.
The RCU_FANOUT_LEAF macro is set to the value of CONFIG_RCU_FANOUT_LEAF
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_LEAF depend
on CONFIG_RCU_EXPERT, so that Kconfig users won't be asked about
CONFIG_RCU_FANOUT_LEAF 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 fd2d4fb517ca..78176001f73b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -603,7 +603,7 @@ config RCU_FANOUT_LEAF int "Tree-based hierarchical RCU leaf-level 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 16 help This option controls the leaf-level fanout of hierarchical |