x86: unify mp_config_acpi_legacy_irqs

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/mpparse_64.c

@@ -804,16 +804,28 @@ void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
 		panic("Max # of irq sources exceeded!\n");
 }
 
+int es7000_plat;
+
 void __init mp_config_acpi_legacy_irqs(void)
 {
 	struct mpc_config_intsrc intsrc;
 	int i = 0;
 	int ioapic = -1;
 
+#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
 	/*
 	 * Fabricate the legacy ISA bus (bus #31).
 	 */
+	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
+#endif
 	set_bit(MP_ISA_BUS, mp_bus_not_pci);
+	Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
+
+	/*
+	 * Older generations of ES7000 have no legacy identity mappings
+	 */
+	if (es7000_plat == 1)
+		return;
 
 	/*
 	 * Locate the IOAPIC that manages the ISA IRQs (0-15).