i386 works with 2 and 3 levels
Signed-off-by: Andi Kleen <ak@suse.de>

Converted to use pud_t by Nick Piggin
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>