FredBezies [1] filed a deletion request for linux-usermode [2]:
Long dead kernel upstream.
[1] https://aur.archlinux.org/account/FredBezies/ [2] https://aur.archlinux.org/pkgbase/linux-usermode/
Request #10628 has been accepted by Alad [1].
aur-requests@lists.archlinux.org