This is the stuff in 2.4 which DaveM has been over so I hope is ok for 2.5.
It provides a simple API for driver writers with hardware that doesn't
do packet padding to say 'make sure n bytes beyond the data is all clear'
for DMA etc.

Still needs some other updates for 2.5 but this squashes the security
stuff as per 2.4

All backports from the 2.4 code

into home.transmeta.com:/home/torvalds/v2.5/linux

into tetrachloride.(none):/mnt/stuff/kernel/2.5/watchdog

into tetrachloride.(none):/mnt/stuff/kernel/2.5/watchdog