__kvm_pgtable_walk
ret = __kvm_pgtable_walk(&data, mm_ops, (kvm_pteref_t)pgtable,
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
WARN_ON(__kvm_pgtable_walk(&data, mm_ops, ptep, level + 1));
ret = __kvm_pgtable_walk(data, mm_ops, childp, level + 1);
ret = __kvm_pgtable_walk(data, pgt->mm_ops, pteref, pgt->start_level);