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, 1 insertions, 1 deletions

diff --git a/drivers/acpi/acpica/exdump.c b/drivers/acpi/acpica/exdump.c
index cdb66d1e3fde..f067bbb0d961 100644
--- a/drivers/acpi/acpica/exdump.c
+++ b/drivers/acpi/acpica/exdump.c
@@ -812,7 +812,7 @@ void acpi_ex_dump_namespace_node(struct acpi_namespace_node *node, u32 flags)
         acpi_ex_out_string("Type", acpi_ut_get_type_name(node->type));
         acpi_ex_out_pointer("Attached Object",
                             acpi_ns_get_attached_object(node));
-        acpi_ex_out_pointer("Parent", acpi_ns_get_parent_node(node));
+        acpi_ex_out_pointer("Parent", node->parent);
 
         acpi_ex_dump_object(ACPI_CAST_PTR(union acpi_operand_object, node),
                             acpi_ex_dump_node);