diff -uprN linux.trees.git/arch/x86/kernel/e820.c acpi-linux/arch/x86/kernel/e820.c
--- linux.trees.git/arch/x86/kernel/e820.c	2008-08-01 08:14:10.000000000 -0700
+++ acpi-linux/arch/x86/kernel/e820.c	2008-08-01 08:24:19.000000000 -0700
@@ -148,6 +148,9 @@ void __init e820_print_map(char *who)
 		case E820_NVS:
 			printk(KERN_CONT "(ACPI NVS)\n");
 			break;
+		case E820_UNUSABLE:
+			printk("(unusable)\n");
+			break;
 		default:
 			printk(KERN_CONT "type %u\n", e820.map[i].type);
 			break;
@@ -1260,6 +1263,7 @@ static inline const char *e820_type_to_s
 	case E820_RAM:	return "System RAM";
 	case E820_ACPI:	return "ACPI Tables";
 	case E820_NVS:	return "ACPI Non-volatile Storage";
+	case E820_UNUSABLE:	return "Unusable memory";
 	default:	return "reserved";
 	}
 }
diff -uprN linux.trees.git/include/asm-x86/e820.h acpi-linux/include/asm-x86/e820.h
--- linux.trees.git/include/asm-x86/e820.h	2008-08-01 08:14:24.000000000 -0700
+++ acpi-linux/include/asm-x86/e820.h	2008-08-01 08:25:55.000000000 -0700
@@ -43,6 +43,7 @@
 #define E820_RESERVED	2
 #define E820_ACPI	3
 #define E820_NVS	4
+#define E820_UNUSABLE	5
 
 /* reserved RAM used by kernel itself */
 #define E820_RESERVED_KERN        128