}
 
 /* per RAPL domain ops, in the order of rapl_domain_type */
-static struct powercap_zone_ops zone_ops[] = {
+static const struct powercap_zone_ops zone_ops[] = {
        /* RAPL_DOMAIN_PACKAGE */
        {
                .get_energy_uj = get_energy_counter,
        return ret;
 }
 
-static struct powercap_zone_constraint_ops constraint_ops = {
+static const struct powercap_zone_constraint_ops constraint_ops = {
        .set_power_limit_uw = set_power_limit,
        .get_power_limit_uw = get_current_power_limit,
        .set_time_window_us = set_time_window,
 
 }
 
 static int create_constraints(struct powercap_zone *power_zone,
-                               int nr_constraints,
-                               struct powercap_zone_constraint_ops *const_ops)
+                       int nr_constraints,
+                       const struct powercap_zone_constraint_ops *const_ops)
 {
        int i;
        int ret = 0;
 };
 
 struct powercap_zone *powercap_register_zone(
-                               struct powercap_zone *power_zone,
-                               struct powercap_control_type *control_type,
-                               const char *name,
-                               struct powercap_zone *parent,
-                               const struct powercap_zone_ops *ops,
-                               int nr_constraints,
-                               struct powercap_zone_constraint_ops *const_ops)
+                       struct powercap_zone *power_zone,
+                       struct powercap_control_type *control_type,
+                       const char *name,
+                       struct powercap_zone *parent,
+                       const struct powercap_zone_ops *ops,
+                       int nr_constraints,
+                       const struct powercap_zone_constraint_ops *const_ops)
 {
        int result;
        int nr_attrs;
 
 struct powercap_zone_constraint {
        int id;
        struct powercap_zone *power_zone;
-       struct powercap_zone_constraint_ops *ops;
+       const struct powercap_zone_constraint_ops *ops;
 };
 
 
                        struct powercap_zone *parent,
                        const struct powercap_zone_ops *ops,
                        int nr_constraints,
-                       struct powercap_zone_constraint_ops *const_ops);
+                       const struct powercap_zone_constraint_ops *const_ops);
 
 /**
 * powercap_unregister_zone() - Unregister a zone device