1 files changed, 15 insertions, 31 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 3f7e60995c8..8e8b76d8a27 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -316,38 +316,28 @@ choice
         prompt "RCU Implementation"
         default TREE_RCU
 
-config CLASSIC_RCU
-        bool "Classic RCU"
-        help
-          This option selects the classic RCU implementation that is
-          designed for best read-side performance on non-realtime
-          systems.
-
-          Select this option if you are unsure.
-
 config TREE_RCU
         bool "Tree-based hierarchical RCU"
         help
           This option selects the RCU implementation that is
           designed for very large SMP system with hundreds or
-          thousands of CPUs.
+          thousands of CPUs.  It also scales down nicely to
+          smaller systems.
 
-config PREEMPT_RCU
-        bool "Preemptible RCU"
+config TREE_PREEMPT_RCU
+        bool "Preemptable tree-based hierarchical RCU"
         depends on PREEMPT
         help
-          This option reduces the latency of the kernel by making certain
-          RCU sections preemptible. Normally RCU code is non-preemptible, if
-          this option is selected then read-only RCU sections become
-          preemptible. This helps latency, but may expose bugs due to
-          now-naive assumptions about each RCU read-side critical section
-          remaining on a given CPU through its execution.
+          This option selects the RCU implementation that is
+          designed for very large SMP systems with hundreds or
+          thousands of CPUs, but for which real-time response
+          is also required.
 
 endchoice
 
 config RCU_TRACE
         bool "Enable tracing for RCU"
-        depends on TREE_RCU || PREEMPT_RCU
+        depends on TREE_RCU || TREE_PREEMPT_RCU
         help
           This option provides tracing in RCU which presents stats
           in debugfs for debugging RCU implementation.
@@ -359,7 +349,7 @@ config RCU_FANOUT
         int "Tree-based hierarchical RCU fanout value"
         range 2 64 if 64BIT
         range 2 32 if !64BIT
-        depends on TREE_RCU
+        depends on TREE_RCU || TREE_PREEMPT_RCU
         default 64 if 64BIT
         default 32 if !64BIT
         help
@@ -374,7 +364,7 @@ config RCU_FANOUT
 
 config RCU_FANOUT_EXACT
         bool "Disable tree-based hierarchical RCU auto-balancing"
-        depends on TREE_RCU
+        depends on TREE_RCU || TREE_PREEMPT_RCU
         default n
         help
           This option forces use of the exact RCU_FANOUT value specified,
@@ -387,18 +377,12 @@ config RCU_FANOUT_EXACT
           Say N if unsure.
 
 config TREE_RCU_TRACE
-        def_bool RCU_TRACE && TREE_RCU
-        select DEBUG_FS
-        help
-          This option provides tracing for the TREE_RCU implementation,
-          permitting Makefile to trivially select kernel/rcutree_trace.c.
-
-config PREEMPT_RCU_TRACE
-        def_bool RCU_TRACE && PREEMPT_RCU
+        def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU )
         select DEBUG_FS
         help
-          This option provides tracing for the PREEMPT_RCU implementation,
-          permitting Makefile to trivially select kernel/rcupreempt_trace.c.
+          This option provides tracing for the TREE_RCU and
+          TREE_PREEMPT_RCU implementations, permitting Makefile to
+          trivially select kernel/rcutree_trace.c.
 
 endmenu # "RCU Subsystem"