kernel/vm/vm_address_region.cpp

869     auto after_iter = subregions_.begin();
872         if (CheckGapLocked(before_iter, after_iter, spot, base, align, size, 0, arch_mmu_flags)) {
880         before_iter = after_iter++;
976     auto after_iter = subregions_.upper_bound(alloc_spot + size - 1);
977     auto before_iter = after_iter;
979     if (after_iter == subregions_.begin() || subregions_.size() == 0) {
987     if (CheckGapLocked(before_iter, after_iter, spot, alloc_spot, align, size, 0,
1026             ChildList::iterator after_iter;
1030                 after_iter = subregions_.begin();
1033                 if (sub_overflow(after_iter->base(), size, &base) ||
1041                 after_iter = subregions_.end();
1053             if (CheckGapLocked(before_iter, after_iter, spot, chosen_base, align, size, 0,