/*
* uvm_km_pgremove_intrsafe: like uvm_km_pgremove(), but for non object backed
* regions.
*
* => when you unmap a part of anonymous kernel memory you want to toss
* the pages right away. (this is called from uvm_unmap_...).
* => none of the pages will ever be busy, and none of them will ever
* be on the active or inactive queues (because they have no object).
*/