Incremental Linking

Hi,   As newbie in linux kernel, I would like to understand the concept of  "incremental linking " w.r.t to linux kernel module.   I have read that kernel loadable modules are being generated and inserted into a running kernel due to this "incremental linking " technology.   If anyone can provide me some pointers to understand the "incremental linking" concept, it will be needful.     Thanks, Somanath