if (!tun)
                goto unlock;
 
-       tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd);
+       tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd);
 
        ret = 0;
        switch (cmd) {
                        break;
                }
                tun->owner = owner;
-               tun_debug(KERN_INFO, tun, "owner set to %d\n",
+               tun_debug(KERN_INFO, tun, "owner set to %u\n",
                          from_kuid(&init_user_ns, tun->owner));
                break;
 
                        break;
                }
                tun->group = group;
-               tun_debug(KERN_INFO, tun, "group set to %d\n",
+               tun_debug(KERN_INFO, tun, "group set to %u\n",
                          from_kgid(&init_user_ns, tun->group));
                break;