1 files changed, 9 insertions, 0 deletions

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 95f4d0ef4819..0a600b8e53f4 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -79,6 +79,15 @@
 #define ACPI_SIG_WDAT           "WDAT"  /* Watchdog Action Table */
 #define ACPI_SIG_WDRT           "WDRT"  /* Watchdog Resource Table */
 
+#ifdef ACPI_UNDEFINED_TABLES
+/*
+ * These tables have been seen in the field, but no definition has been found
+ */
+#define ACPI_SIG_ATKG           "ATKG"
+#define ACPI_SIG_GSCI           "GSCI"  /* GMCH SCI table */
+#define ACPI_SIG_IEIT           "IEIT"
+#endif
+
 /*
  * All tables must be byte-packed to match the ACPI specification, since
  * the tables are provided by the system BIOS.