linux-kernel - [PATCH v5 07/10] drivers,hmat: Use node-notifier instead of memory-notifier

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Message-ID: <20250605142305.244465-8-osalvador@suse.de>
Date: Thu,  5 Jun 2025 16:22:58 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Harry Yoo <harry.yoo@...cle.com>,
	Rakie Kim <rakie.kim@...com>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v5 07/10] drivers,hmat: Use node-notifier instead of memory-notifier

hmat driver is only concerned when a numa node changes its memory state,
specifically when a numa node with memory comes into play for the first
time, because it will register the memory_targets belonging to that numa
node.
So stop using the memory notifier and use the new numa node notifer
instead.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
---
 drivers/acpi/numa/hmat.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
index 9d9052258e92..fe626e969fdc 100644
--- a/drivers/acpi/numa/hmat.c
+++ b/drivers/acpi/numa/hmat.c
@@ -962,10 +962,10 @@ static int hmat_callback(struct notifier_block *self,
 			 unsigned long action, void *arg)
 {
 	struct memory_target *target;
-	struct memory_notify *mnb = arg;
-	int pxm, nid = mnb->status_change_nid;
+	struct node_notify *nb = arg;
+	int pxm, nid = nb->nid;
 
-	if (nid == NUMA_NO_NODE || action != MEM_ONLINE)
+	if (nid == NUMA_NO_NODE || action != NODE_ADDED_FIRST_MEMORY)
 		return NOTIFY_OK;
 
 	pxm = node_to_pxm(nid);
@@ -1118,7 +1118,7 @@ static __init int hmat_init(void)
 	hmat_register_targets();
 
 	/* Keep the table and structures if the notifier may use them */
-	if (hotplug_memory_notifier(hmat_callback, HMAT_CALLBACK_PRI))
+	if (hotplug_node_notifier(hmat_callback, HMAT_CALLBACK_PRI))
 		goto out_put;
 
 	if (!hmat_set_default_dram_perf())
-- 
2.49.0