[x86] Kill warning in dmi_scan.c

- Wrap unused function in same #ifdef as caller.
- Boggle as to WTF CONFIG_MOUNT_ROOT_FAILED_MSG is supposed to do.

arch/i386/kernel/dmi_scan.c

@@ -162,20 +162,6 @@ enum
 
 static char *dmi_ident[DMI_STRING_MAX];
 
-/* print some information suitable for a blacklist entry. */
-static void dmi_dump_system(void)
-{ 
-	printk("DMI: BIOS: %.40s, %.40s, %.40s\n",
-	       dmi_ident[DMI_BIOS_VENDOR], dmi_ident[DMI_BIOS_VERSION],
-	       dmi_ident[DMI_BIOS_DATE]);
-	printk("DMI: System: %.40s, %.40s, %.40s\n",
-	       dmi_ident[DMI_SYS_VENDOR], dmi_ident[DMI_PRODUCT_NAME],
-	       dmi_ident[DMI_PRODUCT_VERSION]); 
-	printk("DMI: Board: %.40s, %.40s, %.40s\n",
-	       dmi_ident[DMI_BOARD_VENDOR], dmi_ident[DMI_BOARD_NAME],
-	       dmi_ident[DMI_BOARD_VERSION]); 
-} 
-
 /*
  *	Save a DMI string
  */
@@ -1118,6 +1104,25 @@ void __init dmi_scan_machine(void)
 EXPORT_SYMBOL(is_unsafe_smbus);
 
 #ifdef CONFIG_MOUNT_ROOT_FAILED_MSG
+
+
+#ifdef CONFIG_ACPI_BOOT 
+
+/* print some information suitable for a blacklist entry. */
+static void dmi_dump_system(void)
+{ 
+	printk("DMI: BIOS: %.40s, %.40s, %.40s\n",
+	       dmi_ident[DMI_BIOS_VENDOR], dmi_ident[DMI_BIOS_VERSION],
+	       dmi_ident[DMI_BIOS_DATE]);
+	printk("DMI: System: %.40s, %.40s, %.40s\n",
+	       dmi_ident[DMI_SYS_VENDOR], dmi_ident[DMI_PRODUCT_NAME],
+	       dmi_ident[DMI_PRODUCT_VERSION]); 
+	printk("DMI: Board: %.40s, %.40s, %.40s\n",
+	       dmi_ident[DMI_BOARD_VENDOR], dmi_ident[DMI_BOARD_NAME],
+	       dmi_ident[DMI_BOARD_VERSION]); 
+} 
+
+
 /*
  * mount_root_failed_msg()
  *
@@ -1130,13 +1135,20 @@ EXPORT_SYMBOL(is_unsafe_smbus);
 void
 mount_root_failed_msg(void)
 {
-#ifdef	CONFIG_ACPI_BOOT
 	printk ("Try booting with pci=noacpi, acpi=ht, "
 		"or acpi=off on the command line.\n");
 	printk ("If one helps, please report the following lines:\n");
 
 	dmi_dump_system();
-#endif
 }
+#else
+
+void mount_root_failed_msg(void)
+{
+
+}
+
+#endif
+
 #endif	/* CONFIG_MOUNT_ROOT_FAILED_MSG */