diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 7c727a9..0abf1d4 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -188,7 +188,7 @@
 
 struct shared_policy {
 	struct rb_root root;
-	spinlock_t lock;
+	struct mutex mutex;
 };
 
 void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);