kobject

http://blog.linux.org.tw/~asho/archives/001816.html
linux/Documentation/kobject.txt
http://lwn.net/Articles/54651/
http://lwn.net/Articles/251201/
http://jno.glas.net/data/prog_books/lin_kern_2.6/0596005652/understandlk-CHP-13-SECT-2.html