} else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE &&
                   !symbol_conf.use_callchain) {
                        symbol_conf.use_callchain = true;
-                       if (register_callchain_param(&callchain_param) < 0) {
+                       if (callchain_register_param(&callchain_param) < 0) {
                                fprintf(stderr, "Can't register callchain"
                                                " params\n");
                                return -EINVAL;
        if (tok2)
                callchain_param.print_limit = strtod(tok2, &endptr);
 setup:
-       if (register_callchain_param(&callchain_param) < 0) {
+       if (callchain_register_param(&callchain_param) < 0) {
                fprintf(stderr, "Can't register callchain params\n");
                return -1;
        }
 
        rb_root->rb_node = chain_root->node.rb_root.rb_node;
 }
 
-int register_callchain_param(struct callchain_param *param)
+int callchain_register_param(struct callchain_param *param)
 {
        switch (param->mode) {
        case CHAIN_GRAPH_ABS:
 
        return node->hit + node->children_hit;
 }
 
-int register_callchain_param(struct callchain_param *param);
+int callchain_register_param(struct callchain_param *param);
 int callchain_append(struct callchain_root *root,
                     struct callchain_cursor *cursor,
                     u64 period);