linux-kernel - [PATCH v2 1/5] mm/memory_hotplug: pass online_type to online_memory

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Message-ID: <20260114235022.3437787-2-gourry@gourry.net>
Date: Wed, 14 Jan 2026 18:50:17 -0500
From: Gregory Price <gourry@...rry.net>
To: linux-mm@...ck.org
Cc: linux-cxl@...r.kernel.org,
	nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux.dev,
	kernel-team@...a.com,
	dan.j.williams@...el.com,
	vishal.l.verma@...el.com,
	dave.jiang@...el.com,
	david@...nel.org,
	mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com,
	osalvador@...e.de,
	akpm@...ux-foundation.org
Subject: [PATCH v2 1/5] mm/memory_hotplug: pass online_type to online_memory_block() via arg

Modify online_memory_block() to accept the online type through its arg
parameter rather than calling mhp_get_default_online_type() internally.
This prepares for allowing callers to specify explicit online types.

Update the caller in add_memory_resource() to pass the default online
type via a local variable. No functional change.

Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>
Signed-off-by: Gregory Price <gourry@...rry.net>
---
 mm/memory_hotplug.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 389989a28abe..5718556121f0 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1337,7 +1337,9 @@ static int check_hotplug_memory_range(u64 start, u64 size)
 
 static int online_memory_block(struct memory_block *mem, void *arg)
 {
-	mem->online_type = mhp_get_default_online_type();
+	int *online_type = arg;
+
+	mem->online_type = *online_type;
 	return device_online(&mem->dev);
 }
 
@@ -1578,8 +1580,12 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 		merge_system_ram_resource(res);
 
 	/* online pages if requested */
-	if (mhp_get_default_online_type() != MMOP_OFFLINE)
-		walk_memory_blocks(start, size, NULL, online_memory_block);
+	if (mhp_get_default_online_type() != MMOP_OFFLINE) {
+		int online_type = mhp_get_default_online_type();
+
+		walk_memory_blocks(start, size, &online_type,
+				   online_memory_block);
+	}
 
 	return ret;
 error:
-- 
2.52.0