[RFC PATCH 6/8] dax/kmem: add the demotion and numa_balancing opt-ins for private nodes

Expose the two kernel-NUMA capabilities as separate per-device sysfs opt-ins:
'demotion' (NODE_PRIVATE_CAP_DEMOTION) and 'numa_balancing'
(NODE_PRIVATE_CAP_NUMA_BALANCING).  demotion additionally requires reclaim,
enforced at hotplug by node_private_register().

Signed-off-by: Gregory Price <[email protected]>
---
 drivers/dax/kmem.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index 3892ad44d4e46..1cb3384c003e3 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -631,12 +631,16 @@ static DEVICE_ATTR_RW(name)
 KMEM_PRIVATE_CAP_ATTR(reclaim, NODE_PRIVATE_CAP_RECLAIM);
 KMEM_PRIVATE_CAP_ATTR(user_numa, NODE_PRIVATE_CAP_USER_NUMA);
 KMEM_PRIVATE_CAP_ATTR(hotunplug, NODE_PRIVATE_CAP_HOTUNPLUG);
+KMEM_PRIVATE_CAP_ATTR(demotion, NODE_PRIVATE_CAP_DEMOTION);
+KMEM_PRIVATE_CAP_ATTR(numa_balancing, NODE_PRIVATE_CAP_NUMA_BALANCING);
 
 /* Per-service opt-ins. Visibility toggled by 'private' control */
 static struct attribute *dax_kmem_private_attrs[] = {
 	&dev_attr_reclaim.attr,
 	&dev_attr_user_numa.attr,
 	&dev_attr_hotunplug.attr,
+	&dev_attr_demotion.attr,
+	&dev_attr_numa_balancing.attr,
 	NULL,
 };
 static const struct attribute_group dax_kmem_private_group = {
-- 
2.53.0-Meta