X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2FKconfig.preempt;h=9fdba03dc1fcd119c31274fb3590480aa1db9f05;hb=d819c49da624e3ee09b2844603d58265039eecdd;hp=4420ef427f833d03451eab38edce89a267f8bdbc;hpb=58b8a73ab8becfcaea84abc2a06038281efa4c8a;p=linux-2.6

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 4420ef427f..9fdba03dc1 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -52,12 +52,23 @@ config PREEMPT
 
 endchoice
 
-config PREEMPT_BKL
-	def_bool y
-	depends on SMP || PREEMPT
+config PREEMPT_RCU
+	bool "Preemptible RCU"
+	depends on PREEMPT
+	default n
+	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.
 
 config RCU_TRACE
 	bool "Enable tracing for RCU - currently stats in debugfs"
+	depends on PREEMPT_RCU
 	select DEBUG_FS
 	default y
 	help