On PPC 8xx, the DataTLBMiss handler does not jump directly to the page
fault handler, as was the case in v2.4.

It instead loads an invalid TLB which causes a subsequent DataTLBError
exception.

The comment on top of it haven't been update to reflect the change, though.
Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>