ACPICA: Use designated initializers

The struct layout randomization plugin detects and randomizes any structs
that contain only function pointers. Once layout is randomized, all
initialization must be designated or the compiler will misalign the
assignments. This switches all the ACPICA function pointer struct to
use designated initializers, using the proposed upstream ACPICA macro:
https://github.com/acpica/acpica/pull/248/

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/hwxfsleep.c

@@ -70,11 +70,15 @@ static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
 /* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
 
 static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
-	{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep),
-	 acpi_hw_extended_sleep},
-	{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep),
-	 acpi_hw_extended_wake_prep},
-	{ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake}
+	{ACPI_STRUCT_INIT(legacy_function,
+			  ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep)),
+	 ACPI_STRUCT_INIT(extended_function, acpi_hw_extended_sleep) },
+	{ACPI_STRUCT_INIT(legacy_function,
+			  ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep)),
+	 ACPI_STRUCT_INIT(extended_function, acpi_hw_extended_wake_prep) },
+	{ACPI_STRUCT_INIT(legacy_function,
+			  ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake)),
+	 ACPI_STRUCT_INIT(extended_function, acpi_hw_extended_wake) }
 };
 
 /*

include/acpi/platform/acenv.h

@@ -382,4 +382,8 @@
 #define ACPI_INIT_FUNCTION
 #endif
 
+#ifndef ACPI_STRUCT_INIT
+#define ACPI_STRUCT_INIT(field, value) value
+#endif
+
 #endif				/* __ACENV_H__ */

include/acpi/platform/aclinux.h

@@ -178,6 +178,8 @@
 #define ACPI_MSG_BIOS_ERROR     KERN_ERR "ACPI BIOS Error (bug): "
 #define ACPI_MSG_BIOS_WARNING   KERN_WARNING "ACPI BIOS Warning (bug): "
 
+#define ACPI_STRUCT_INIT(field, value)	.field = value
+
 #else				/* !__KERNEL__ */
 
 #define ACPI_USE_STANDARD_HEADERS