D17794.55343.diff boots and survived a few tests.

OK. I copy only my repository that is I want use.

In D17955#421328, @yamori813_yahoo.co.jp wrote:

My understand is sys/gnu/dts have only openwrt(opneled) dts files. And sys/dts have freebsd original dts files. MZK-W04N-XX.dts is my missing add dts file then move to freebsd dts directory. Do you think how to sync openwrt(opneled) dts files ?

Keep the changes to function names and switch statements. Discard the changes to the vm_map_findspace interface and the assertions. I have no idea which of these led to failure, but I've the discarded the changes that seemed most dangerous.

My understand is sys/gnu/dts have only openwrt(opneled) dts files. And sys/dts have freebsd original dts files. MZK-W04N-XX.dts is my missing add dts file then move to freebsd dts directory. Do you think how to sync openwrt(opneled) dts files ?

D17794.55338.patch does not boot:

I've installed cqueues, ldoc and penlight on freebsd 12.0 using Lua52. Output for ldoc and penlight installation:

In response to reviewer feedback:
Shorten the names of splay helper functions.
Avoid using back-to-back switch statements.
Change the interface to vm_map_findspace, to return the found address directly, rather than by parameter.
Add a routine for testing the data consistency of the vm_map and invoke it after every update to map->root.