On Sat, Dec 20, 2003 at 05:32:35PM -0500, Andrew Brown wrote:

> i've got two pointers.
> 
> one may or may not be a valid kernel pointer.  i can't tell.
> 
> the other may be a pointer into userspace or a pointer into kernel
> space.  i can tell which kind it is, and if it's the latter, i'm
> perfectly willing to assume that it's valid.

I give up.  How can you tell if a pointer is to userspace or kernel
space?

Eduardo