memblock_isolate_range
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
ret = memblock_isolate_range(&memblock.memory, base, size,
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);