diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 6fe28d6f282bea26174b59723ba9c8cf4a3279a3..681a5d58d40dcf5b40d73da17639b4c7729a936c 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -62,7 +62,7 @@
  * When there is only one cpuset (the root cpuset) we can
  * short circuit some hooks.
  */
-int number_of_cpusets;
+int number_of_cpusets __read_mostly;
 
 /* See "Frequency meter" comments, below. */