message: unsupported module, tainting kernel

Hi, If I try to build any of my drivers (e100,e1000,bcm5700,vlan) in SuSE9, I am seeing the message "unsupported module, tainting kernel". But this is not creating any other problem. I want to know why is this message coming? Regards, Anil V Gangur Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or Mailadmin@wipro.com immediately and destroy all copies of this message and any attachments.