X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2FKconfig.preempt;h=9fdba03dc1fcd119c31274fb3590480aa1db9f05;hb=c5d712433ff57a66d8fb79a57a4fc7a7c3467b97;hp=6b066632e40c2a9f0621d487d0caf5a7700c7b41;hpb=6869ce1c145aaea9f9f8eb8623a261d316b0cd19;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 6b066632e40..9fdba03dc1f 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -52,17 +52,28 @@ config PREEMPT
 
 endchoice
 
-config PREEMPT_BKL
-	bool "Preempt The Big Kernel Lock"
-	depends on SMP || PREEMPT
-	default y
+config PREEMPT_RCU
+	bool "Preemptible RCU"
+	depends on PREEMPT
+	default n
 	help
-	  This option reduces the latency of the kernel by making the
-	  big kernel lock preemptible.
+	  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 Y here if you are building a kernel for a desktop system.
 	  Say N if you are unsure.
 
-config PREEMPT_NOTIFIERS
-	bool
+config RCU_TRACE
+	bool "Enable tracing for RCU - currently stats in debugfs"
+	depends on PREEMPT_RCU
+	select DEBUG_FS
+	default y
+	help
+	  This option provides tracing in RCU which presents stats
+	  in debugfs for debugging RCU implementation.
 
+	  Say Y here if you want to enable RCU tracing
+	  Say N if you are unsure.