udev and existing /dev (devtmpfs)

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Hi,

After starting udev on the /dev which is devtmpfs the udev does not 'take over' already created nodes unless I add in the udev's init script

'udevadm trigger --type=devices --action=change'

   right after

'udevadm trigger --type=devices --action=add'

If there is no action=change, the /dev device mapper nodes looks like (all are nodes, different permissions):
brw-rw---- 1 root disk 253,   0 Jan 17 19:51 /dev/dm-0
brw-rw---- 1 root disk 253,   1 Jan 17 19:51 /dev/dm-1
brw-rw---- 1 root disk 253,   2 Jan 17 19:51 /dev/dm-2
brw-rw---- 1 root disk 253,   3 Jan 17 19:51 /dev/dm-3
brw-rw---- 1 root disk 253,   4 Jan 17 19:51 /dev/dm-4
brw-rw---- 1 root disk 253,   5 Jan 17 19:51 /dev/dm-5
crw------- 1 root root  10, 236 Jan 17 19:51 /dev/mapper/control
brw------- 1 root root 253,   0 Jan 17 19:51 /dev/mapper/enc_root
brw------- 1 root root 253,   5 Jan 17 19:51 /dev/mapper/vg-dropzone
brw------- 1 root root 253,   4 Jan 17 19:51 /dev/mapper/vg-home
brw------- 1 root root 253,   3 Jan 17 19:51 /dev/mapper/vg-rootfs
brw------- 1 root root 253,   1 Jan 17 19:51 /dev/mapper/vg-swap
brw------- 1 root root 253,   2 Jan 17 19:51 /dev/mapper/vg-tmp

but after action=change it does look like:
brw-rw---- 1 root disk 253,   0 Jan 17 19:50 /dev/dm-0
brw-rw---- 1 root disk 253,   1 Jan 17 19:50 /dev/dm-1
brw-rw---- 1 root disk 253,   2 Jan 17 19:50 /dev/dm-2
brw-rw---- 1 root disk 253,   3 Jan 17 19:50 /dev/dm-3
brw-rw---- 1 root disk 253,   4 Jan 17 19:50 /dev/dm-4
brw-rw---- 1 root disk 253,   5 Jan 17 19:50 /dev/dm-5
crw------- 1 root root  10, 236 Jan 17 19:50 /dev/mapper/control
lrwxrwxrwx 1 root root        7 Jan 17 19:50 /dev/mapper/enc_root -> ../dm-0
lrwxrwxrwx 1 root root 7 Jan 17 19:50 /dev/mapper/vg-dropzone -> ../dm-5
lrwxrwxrwx 1 root root        7 Jan 17 19:50 /dev/mapper/vg-home -> ../dm-4
lrwxrwxrwx 1 root root 7 Jan 17 19:50 /dev/mapper/vg-rootfs -> ../dm-3
lrwxrwxrwx 1 root root        7 Jan 17 19:50 /dev/mapper/vg-swap -> ../dm-1
lrwxrwxrwx 1 root root        7 Jan 17 19:50 /dev/mapper/vg-tmp -> ../dm-2

The /dev/mapper/* become symlinks to /dev/dm-* (following udev rules).

The question is: in such scenario, where udev use already-created /dev (whatever it is devtmpfs or maybe mdev-created), should we add the action=change to the init script? If no, then what should we do to udevize /dev?

Distro gentoo, udev-171, I have such issue on every box I use.

-- Piotr.
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