ACPI: tables: Simplify PPTT leaf node detection

jlintonarm · rafaeljw · commit 4909e6df213a · 2019-03-11T12:14:57.000+01:00
ACPI 6.3 bumps the PPTT table revision and adds a LEAF_NODE flag.

This allows us to avoid a second pass through the table to assure
that the node in question is a leaf.

Signed-off-by: Jeremy Linton &lt;jeremy.linton@arm.com&gt;
Reviewed-by: Sudeep Holla &lt;sudeep.holla@arm.com&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
@@ -209,6 +209,9 @@ static int acpi_pptt_leaf_node(struct acpi_table_header *table_hdr,
 	struct acpi_pptt_processor *cpu_node;
 	u32 proc_sz;
 
+	if (table_hdr->revision > 1)
+		return (node->flags & ACPI_PPTT_ACPI_LEAF_NODE);
+
 	table_end = (unsigned long)table_hdr + table_hdr->length;
 	node_entry = ACPI_PTR_DIFF(node, table_hdr);
 	entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
