Manuel Bouyer <bouyer@antioche.lip6.fr> typed:
:I tried a UCB kernel on my developement machine, which has sources (I don't
:use objdirs) on LFS.

Chuck Silvers wrote (3 or 4 days ago):
:mmap() on union filesystems should be working again now
:with rev. 1.49 of sys/miscfs/union/union_vnops.c,
:in the same non-coherent fashion as before UBC was integrated.
:well, actually it should be somewhat better now than then,
:but it's still not quite right.
:the problems with kernfs, procfs, and LFS remain.
:I'll get to these (and the remaining unionfs coherency issues)
:eventually but it'll be at least a month, likely a couple months.