diff --git a/drivers/acpi/acpica/nsparse.c b/drivers/acpi/acpica/nsparse.c
index c95a119767b5..57a4cfe547e4 100644
--- a/drivers/acpi/acpica/nsparse.c
+++ b/drivers/acpi/acpica/nsparse.c
@@ -117,6 +117,13 @@ acpi_ns_one_complete_parse(u32 pass_number,
 					       (u8) pass_number);
 	}
 
+	/* Found OSDT table, enable the namespace override feature */
+
+	if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT) &&
+	    pass_number == ACPI_IMODE_LOAD_PASS1) {
+		walk_state->namespace_override = TRUE;
+	}
+
 	if (ACPI_FAILURE(status)) {
 		acpi_ds_delete_walk_state(walk_state);
 		goto cleanup;
diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
index b63e35d6d1bf..960bd999a6b3 100644
--- a/drivers/acpi/acpica/tbxfload.c
+++ b/drivers/acpi/acpica/tbxfload.c
@@ -173,7 +173,11 @@ static acpi_status acpi_tb_load_namespace(void)
 		     &&
 		     !ACPI_COMPARE_NAME(&
 					(acpi_gbl_root_table_list.tables[i].
-					 signature), ACPI_SIG_PSDT))
+					 signature), ACPI_SIG_PSDT)
+		     &&
+		     !ACPI_COMPARE_NAME(&
+					(acpi_gbl_root_table_list.tables[i].
+					 signature), ACPI_SIG_OSDT))
 		    ||
 		    ACPI_FAILURE(acpi_tb_validate_table
 				 (&acpi_gbl_root_table_list.tables[i]))) {
diff --git a/drivers/acpi/acpica/utmisc.c b/drivers/acpi/acpica/utmisc.c
index cbb7034d28d8..28099e230008 100644
--- a/drivers/acpi/acpica/utmisc.c
+++ b/drivers/acpi/acpica/utmisc.c
@@ -97,7 +97,8 @@ u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
 
 	if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) ||
 	    ACPI_COMPARE_NAME(table->signature, ACPI_SIG_PSDT) ||
-	    ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
+	    ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT) ||
+	    ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT)) {
 		return (TRUE);
 	}
 
diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h
index cb8a6b97ceda..2d5faf508cad 100644
--- a/include/acpi/actbl.h
+++ b/include/acpi/actbl.h
@@ -65,6 +65,7 @@
 #define ACPI_SIG_DSDT           "DSDT"	/* Differentiated System Description Table */
 #define ACPI_SIG_FADT           "FACP"	/* Fixed ACPI Description Table */
 #define ACPI_SIG_FACS           "FACS"	/* Firmware ACPI Control Structure */
+#define ACPI_SIG_OSDT           "OSDT"	/* Override System Description Table */
 #define ACPI_SIG_PSDT           "PSDT"	/* Persistent System Description Table */
 #define ACPI_SIG_RSDP           "RSD PTR "	/* Root System Description Pointer */
 #define ACPI_SIG_RSDT           "RSDT"	/* Root System Description Table */