Some ACPI-related changes were recently made to i8042 discovery for ia64.
Unfortunately this broke a significant number of Dell laptops due to their
having incorrect BIOS tables.

So, for now, arrange for the new code to be ia64-only.

From: Dmitry Torokhov <dtor_core@ameritech.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>