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-rw-r--r--init/Kconfig28
1 files changed, 28 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index f5becd2a12f..0eda68f0ad5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -763,3 +763,31 @@ source "block/Kconfig"
config PREEMPT_NOTIFIERS
bool
+
+choice
+ prompt "RCU implementation type:"
+ default CLASSIC_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.
+
+ Say Y if you are unsure.
+
+config PREEMPT_RCU
+ bool "Preemptible 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.
+
+ Say N if you are unsure.
+
+endchoice