Patch "acpi, numa: fix pxm to online numa node associations" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

acpi, numa: fix pxm to online numa node associations

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
acpi-numa-fix-pxm-to-online-numa-node-associations.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Dan Williams <[email protected]>
Date: Thu, 15 Mar 2018 19:49:14 -0700
Subject: acpi, numa: fix pxm to online numa node associations

From: Dan Williams <[email protected]>

commit dc9e0a9347e932e3fd3cd03e7ff241022ed6ea8a upstream.

Commit 99759869faf1 "acpi: Add acpi_map_pxm_to_online_node()" added support for mapping a given proximity to its nearest, by SLIT distance, online node. However, it sometimes returns unexpected results due to the fact that it switches from comparing the PXM node to the last node that was closer than the current max.

    for_each_online_node(n) {
            dist = node_distance(node, n);
            if (dist < min_dist) {
                    min_dist = dist;
                    node = n;	<---- from this point we're using the
				      wrong node for node_distance()

---
 drivers/acpi/numa.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

@@ -103,25 +103,27 @@ int acpi_map_pxm_to_node(int pxm)
  */
 int acpi_map_pxm_to_online_node(int pxm)
 {
-	int node, n, dist, min_dist;
+	int node, min_node;
 
 	node = acpi_map_pxm_to_node(pxm);
 
 	if (node == NUMA_NO_NODE)
 		node = 0;
 
+	min_node = node;
 	if (!node_online(node)) {
-		min_dist = INT_MAX;
+		int min_dist = INT_MAX, dist, n;
+
 		for_each_online_node(n) {
 			dist = node_distance(node, n);
 			if (dist < min_dist) {
 				min_dist = dist;
-				node = n;
+				min_node = n;
 			}
 		}
 	}
 
-	return node;
+	return min_node;
 }
 EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/acpi-numa-fix-pxm-to-online-numa-node-associations.patch queue-4.9/libnvdimm-btt-blk-do-integrity-setup-before-add_disk.patch