Make arch/sparc64/kernel/trampoline.S in 2.6.27.1 lock prom_entry_lock
when calling the PROM.  This prevents a race condition that I observed
causing a hang on startup on a 12-CPU E4500.

I am not subscribed to this list, so please CC me on replies.
Signed-off-by: NAndrea Shepard <andrea@persephoneslair.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>