PPC4xx preempt fixes. Based on previous Classic PPC patch.
Signed-off-by: Tom Rini <trini@kernel.crashing.org>
Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>