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-rw-r--r--kernel/ksysfs.c22
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
};