Quote Originally Posted by marazmista View Post
If it does, that means the debugfs is mounted under proper location, but "none is already mounted on /var/lib/ntp/proc" bothers me.
For several filesystems, there is no block device; some of these are tmpfs, ramfs, debugfs, sysfs, procfs, cgroup, and cpuset.
For a full list, see:
grep ^nodev /proc/filesystems
Anyhow, the mount() syscall has the prototype
       int mount(const char *source, const char *target,
                 const char *filesystemtype, unsigned long mountflags,
                 const void *data);
So for compatability reasons, there has to be a source passed to mount(); this is achieved by passing a nonsense string to the mount command.
A number of distros just pass "none" for all the nodev filesystems.
I prefer to use a name based on the path or filesystem (for example: mount -t sysfs sysfs /sys; mount -t devpts devpts /dev/pts), since it avoids the "none is already mounted on..." nonsense.