diff --git a/[refs] b/[refs]
index dffe879d0a8e..0c6d26419300 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a9fc03125ea0001ff18bc29da9539b587fdbd1d7
+refs/heads/master: 4461cf546ec8c97b6b997b8e533d6de1960499d3
diff --git a/trunk/include/acpi/actbl2.h b/trunk/include/acpi/actbl2.h
index 95f4d0ef4819..0a600b8e53f4 100644
--- a/trunk/include/acpi/actbl2.h
+++ b/trunk/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.