uvm_pmr_addr_cmp
RBT_GENERATE(uvm_pmr_addr, vm_page, objt, uvm_pmr_addr_cmp);
cmp = uvm_pmr_addr_cmp(lhs - 1, rhs - 1);
int uvm_pmr_addr_cmp(const struct vm_page *, const struct vm_page *);
RBT_PROTOTYPE(uvm_pmr_addr, vm_page, objt, uvm_pmr_addr_cmp);