linux-kernel - [PATCH] ACPI/PPTT: Simplify leaf node detection.

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Date:   Fri,  1 Mar 2019 12:52:21 -0600
From:   Jeremy Linton <jeremy.linton@....com>
To:     linux-acpi@...r.kernel.org
Cc:     rjw@...ysocki.net, lenb@...nel.org, sudeep.holla@....com,
        Lorenzo.Pieralisi@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Jeremy Linton <jeremy.linton@....com>
Subject: [PATCH] ACPI/PPTT: Simplify leaf node detection.

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 <jeremy.linton@....com>
---
 drivers/acpi/pptt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index ad31c50de3be..065c4fc245d1 100644
--- 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,
-- 
2.20.1