+ * When the kernel command line argument "kdbus" is specified,
+ systemd will automatically load the kdbus.ko kernel module. At
+ this stage of development, it is only useful for testing kdbus,
+ and should not be used in production. Note: if "--enable-kdbus"
+ is specified and the kdbus.ko kernel module is available and
+ "kdbus" is added to the kernel command line, the entire system
+ runs with kdbus instead of dbus-daemon, with the above mentioned
+ problem of missing the system policy enforcement. Also a future
+ version of kdbus.ko or a newer systemd will not be compatible with
+ each other, and will unlikely be able to boot the machine if only
+ one of them is updated.
+