> The issue can be easily reproduced.
> #mount -t tmpfs "" /tmp/tdir
> #grep "/tmp/tdir" /proc/$$/mountinfo
The kernel has accepted "" before the new mount api was introduced. So
the regression was showing "none" when userspace requested "" which got
fixed. The patch proposed right here would reintroduce the regression:
(1) 4.15
root@b1:~# cat /proc/self/mountinfo | grep mnt
386 28 0:52 / /mnt rw,relatime shared:223 - tmpfs rw
(2) 5.4
root@f1:~# cat /proc/self/mountinfo | grep mnt
584 31 0:55 / /mnt rw,relatime shared:336 - tmpfs none rw
(3) 6.10-rc6
root@localhost:~# cat /proc/self/mountinfo | grep mnt
62 130 0:60 / /mnt rw,relatime shared:135 - tmpfs rw,inode64
