1 files changed, 20 insertions, 2 deletions

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index e83b26464061..b4e2fa52d8bc 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -20,7 +20,7 @@
 #include <linux/capability.h>
 #include <linux/compiler.h>
 
-#include <linux/rcupdate.h>     /* rcu_expedited */
+#include <linux/rcupdate.h>     /* rcu_expedited and rcu_normal */
 
 #define KERNEL_ATTR_RO(_name) \
 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
@@ -148,7 +148,7 @@ int rcu_expedited;
 static ssize_t rcu_expedited_show(struct kobject *kobj,
                                   struct kobj_attribute *attr, char *buf)
 {
-        return sprintf(buf, "%d\n", rcu_expedited);
+        return sprintf(buf, "%d\n", READ_ONCE(rcu_expedited));
 }
 static ssize_t rcu_expedited_store(struct kobject *kobj,
                                    struct kobj_attribute *attr,
@@ -161,6 +161,23 @@ static ssize_t rcu_expedited_store(struct kobject *kobj,
 }
 KERNEL_ATTR_RW(rcu_expedited);
 
+int rcu_normal;
+static ssize_t rcu_normal_show(struct kobject *kobj,
+                               struct kobj_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%d\n", READ_ONCE(rcu_normal));
+}
+static ssize_t rcu_normal_store(struct kobject *kobj,
+                                struct kobj_attribute *attr,
+                                const char *buf, size_t count)
+{
+        if (kstrtoint(buf, 0, &rcu_normal))
+                return -EINVAL;
+
+        return count;
+}
+KERNEL_ATTR_RW(rcu_normal);
+
 /*
  * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
  */
@@ -203,6 +220,7 @@ static struct attribute * kernel_attrs[] = {
         &vmcoreinfo_attr.attr,
 #endif
         &rcu_expedited_attr.attr,
+        &rcu_normal_attr.attr,
         NULL
 };