merge_or_add_vmap_area_augment
merge_or_add_vmap_area_augment(va, &free_vmap_area_root, &free_vmap_area_list);
merge_or_add_vmap_area_augment(va,
va = merge_or_add_vmap_area_augment(vas[area], &free_vmap_area_root,
va = merge_or_add_vmap_area_augment(vas[area], &free_vmap_area_root,