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>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c
index 8ba1464efd11..1b734eb7c0c0 100644
--- a/drivers/acpi/acpica/exconfig.c
+++ b/drivers/acpi/acpica/exconfig.c
@@ -576,6 +576,13 @@ 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()
          * when it calls acpi_ex_resolve_operands(), the handle is more completely