s390/lowcore: replace lowcore irb array with a per-cpu variable

Remove the 96-byte irb array from the lowcore and create a per-cpu
variable instead. That way we will pick up any change in the definition
of the struct irb automatically.

Acked-By: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/eadm_sch.c

@@ -134,7 +134,7 @@ static void eadm_subchannel_irq(struct subchannel *sch)
 {
 	struct eadm_private *private = get_eadm_private(sch);
 	struct eadm_scsw *scsw = &sch->schib.scsw.eadm;
-	struct irb *irb = (struct irb *)&S390_lowcore.irb;
+	struct irb *irb = &__get_cpu_var(cio_irb);
 	int error = 0;
 
 	EADM_LOG(6, "irq");