diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 8ccedf7..e3c16c9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -132,6 +132,11 @@
 int acpi_register_gsi (u32 gsi, int triggering, int polarity);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 
+#ifdef CONFIG_X86_IO_APIC
+extern int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity);
+#else
+#define acpi_get_override_irq(bus, trigger, polarity) (-1)
+#endif
 /*
  * This function undoes the effect of one call to acpi_register_gsi().
  * If this matches the last registration, any IRQ resources for gsi