Please revert 2.6.19's 99a10a60ba9bedcf5d70ef81414d3e03816afa3f (shown
below) for 2.6.20. Nadia Derbey has reported that mmap of /dev/kmem no
longer works with the kernel virtual address as offset, and Franck has
confirmed that his patch came from a misunderstanding of what an offset
means to /dev/kmem - whereas his patch description seems to say that he
was correcting the offset on a few plaforms, there was no such problem
to correct, and his patch was in fact changing its API on all platforms.