ACPICA: Unload operator: Emit a warning if and when it is ever used.

We would like to see the ASL for any machine that uses this operator,
so emit at least a warning to hopefully draw some attention.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/exconfig.c

@@ -575,6 +575,13 @@ acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 
 	ACPI_FUNCTION_TRACE(ex_unload_table);
 
+	/*
+	 * Temporarily emit a warning so that the ASL for the machine can be
+	 * hopefully obtained. This is to say that the Unload() operator is
+	 * extremely rare if not completely unused.
+	 */
+	ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
+
 	/*
 	 * Validate the handle
 	 * Although the handle is partially validated in acpi_ex_reconfiguration()