When using daxctl, we don't get a hint/suggestion to use sudo/root. For example, running "daxctl reconfigure-device -m system-ram dax0.0" without sudo will only print the following:
libdaxctl: daxctl_dev_disable: dax0.0: failed to disable dax0.0: disable failed: Device or resource busy error reconfiguring devices: Device or resource busy reconfigured 0 devices But running it as sudo is okay. The message is a little misleading, since the problem is not having root privileges, not the device being busy. IMO a hint in the end would be a nice reminder.
