rcu: Remove prompt for RCU implementation

The RCU implementation is chosen based on PREEMPT and SMP config options
and is not really a user-selectable choice.  This commit removes the
menu entry, given that there is not much point in calling something a
choice when there is in fact no choice..  The TINY_RCU, TREE_RCU, and
PREEMPT_RCU Kconfig options continue to be selected based solely on the
values of the PREEMPT and SMP options.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/init/Kconfig b/init/Kconfig
index af2c93c..4c08197 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -465,13 +465,9 @@ endmenu # "CPU/Task time and stats accounting"
 
 menu "RCU Subsystem"
 
-choice
-       prompt "RCU Implementation"
-       default TREE_RCU
-
 config TREE_RCU
-       bool "Tree-based hierarchical RCU"
-       depends on !PREEMPT && SMP
+       bool
+       default y if !PREEMPT && SMP
        help
          This option selects the RCU implementation that is
          designed for very large SMP system with hundreds or
@@ -479,8 +475,8 @@ config TREE_RCU
          smaller systems.
 
 config PREEMPT_RCU
-       bool "Preemptible tree-based hierarchical RCU"
-       depends on PREEMPT
+       bool
+       default y if PREEMPT
        help
          This option selects the RCU implementation that is
          designed for very large SMP systems with hundreds or
@@ -491,16 +487,14 @@ config PREEMPT_RCU
          Select this option if you are unsure.
 
 config TINY_RCU
-       bool "UP-only small-memory-footprint RCU"
-       depends on !PREEMPT && !SMP
+       bool
+       default y if !PREEMPT && !SMP
        help
          This option selects the RCU implementation that is
          designed for UP systems from which real-time response
          is not required.  This option greatly reduces the
          memory footprint of RCU.
 
-endchoice
-
 config RCU_EXPERT
        bool "Make expert-level adjustments to RCU configuration"
        default n