The palinfo module may call ia64_pal_tr_read using an IPI.  If the processor
receiving the IPI is idle, the call will fail since the idle process stack is
in region 5 and ia64_pal_tr_read uses __pa rather than ia64_tpa.  This small
patch fixes the problem by making it use ia64_tpa instead.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>