#include <linux/random.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
+#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/workqueue.h>
#include <linux/kdev_t.h>
atomic_long_read(&group->counter[cm_attr->index]));
}
-static struct sysfs_ops cm_counter_ops = {
+static const struct sysfs_ops cm_counter_ops = {
.show = cm_show_counter
};