diff -urN linux-2.4.23/drivers/scsi/aic7xxx/aic79xx_osm_pci.c linux/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
--- linux-2.4.23/drivers/scsi/aic7xxx/aic79xx_osm_pci.c	2003-08-25 07:44:42.000000000 -0400
+++ linux/drivers/scsi/aic7xxx/aic79xx_osm_pci.c	2003-12-01 15:51:53.000000000 -0500
@@ -52,9 +52,11 @@
 					const struct pci_device_id *ent);
 static int	ahd_linux_pci_reserve_io_regions(struct ahd_softc *ahd,
 						 u_long *base, u_long *base2);
+#ifndef __x86_64__
 static int	ahd_linux_pci_reserve_mem_region(struct ahd_softc *ahd,
 						 u_long *bus_addr,
 						 uint8_t **maddr);
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 static void	ahd_linux_pci_dev_remove(struct pci_dev *pdev);
 
@@ -271,6 +273,9 @@
 	return (0);
 }
 
+
+#ifndef __x86_64__
+
 static int
 ahd_linux_pci_reserve_mem_region(struct ahd_softc *ahd,
 				 u_long *bus_addr,
@@ -319,6 +324,8 @@
 	return (error);
 }
 
+#endif
+
 int
 ahd_pci_map_registers(struct ahd_softc *ahd)
 {