ACPICA: Performance enhancement for namespace search and access

This change enhances the performance of namespace searches and
walks by adding a backpointer to the parent in each namespace
node. On large namespaces, this change can improve overall ACPI
performance by up to 9X.  Adding a pointer to each namespace node
increases the overall size of the internal namespace by about 5%,
since each namespace entry usually consists of both a namespace
node and an ACPI operand object.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/acpi/acpica/dsopcode.c b/drivers/acpi/acpica/dsopcode.c
index 53a7e416f33e..7c0e74227171 100644
--- a/drivers/acpi/acpica/dsopcode.c
+++ b/drivers/acpi/acpica/dsopcode.c
@@ -213,7 +213,7 @@ acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
 
         /* Execute the AML code for the term_arg arguments */
 
-        status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
+        status = acpi_ds_execute_arguments(node, node->parent,
                                            extra_desc->extra.aml_length,
                                            extra_desc->extra.aml_start);
         return_ACPI_STATUS(status);
@@ -257,7 +257,7 @@ acpi_ds_get_bank_field_arguments(union acpi_operand_object *obj_desc)
 
         /* Execute the AML code for the term_arg arguments */
 
-        status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
+        status = acpi_ds_execute_arguments(node, node->parent,
                                            extra_desc->extra.aml_length,
                                            extra_desc->extra.aml_start);
         return_ACPI_STATUS(status);
@@ -394,7 +394,7 @@ acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
 
         /* Execute the argument AML */
 
-        status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
+        status = acpi_ds_execute_arguments(node, node->parent,
                                            extra_desc->extra.aml_length,
                                            extra_desc->extra.aml_start);
         if (ACPI_FAILURE(status)) {