diff --git a/[refs] b/[refs]
index 8a31627ca878..23bc5e7c2538 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 109d71c6dd52ec08878c2c67eb4c0bd67fcbc80b
+refs/heads/master: f5754bfd107b08edddaf871d676ec6fe0792d07a
diff --git a/trunk/Documentation/lockstat.txt b/trunk/Documentation/lockstat.txt
index 9cb9138f7a79..65f4c795015d 100644
--- a/trunk/Documentation/lockstat.txt
+++ b/trunk/Documentation/lockstat.txt
@@ -62,8 +62,20 @@ applicable).
 It also tracks 4 contention points per class. A contention point is a call site
 that had to wait on lock acquisition.
 
+ - CONFIGURATION
+
+Lock statistics are enabled via CONFIG_LOCK_STATS.
+
  - USAGE
 
+Enable collection of statistics:
+
+# echo 1 >/proc/sys/kernel/lock_stat
+
+Disable collection of statistics:
+
+# echo 0 >/proc/sys/kernel/lock_stat
+
 Look at the current lock statistics:
 
 ( line numbers not part of actual output, done for clarity in the explanation