diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index cbb6f08..aabb988 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -352,31 +352,24 @@
 
 	is_done = -EIO;
 
-	/* Can't write pstate_cnt to smi_cmd if either value is zero */
-	if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
+	/* Can't write pstate_control to smi_command if either value is zero */
+	if ((!acpi_fadt.smi_command) || (!acpi_fadt.pstate_control)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 		module_put(calling_module);
 		return 0;
 	}
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-			  "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
-			  acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
+			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
+			  acpi_fadt.pstate_control, acpi_fadt.smi_command));
 
-	/* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
-	 * it anyway, so we need to support it... */
-	if (acpi_fadt_is_v1) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "Using v1.0 FADT reserved value for pstate_cnt\n"));
-	}
-
-	status = acpi_os_write_port(acpi_fadt.smi_cmd,
-				    (u32) acpi_fadt.pstate_cnt, 8);
+	status = acpi_os_write_port(acpi_fadt.smi_command,
+				    (u32) acpi_fadt.pstate_control, 8);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
-				"Failed to write pstate_cnt [0x%x] to "
-				"smi_cmd [0x%x]", acpi_fadt.pstate_cnt,
-				acpi_fadt.smi_cmd));
+				"Failed to write pstate_control [0x%x] to "
+				"smi_command [0x%x]", acpi_fadt.pstate_control,
+				acpi_fadt.smi_command));
 		module_put(calling_module);
 		return status;
 	}