From 65c1a93e438e42940bdc14b72288f42ca2e3ff06 Mon Sep 17 00:00:00 2001
From: Gregory Price <gourry@gourry.net>
Date: Sun, 12 Jul 2026 11:44:57 -0400
Subject: [PATCH] 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.

Link: https://lore.kernel.org/20260712154505.3564379-4-gourry@gourry.net
Signed-off-by: Gregory Price <gourry@gourry.net>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Dan Williams <djbw@kernel.org>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/memory_hotplug.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 99090f49d2df..1dc0a1bb3a75 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1340,7 +1340,9 @@ 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();
+	enum mmop *online_type = arg;
+
+	mem->online_type = *online_type;
 	return device_online(&mem->dev);
 }
 
@@ -1497,6 +1499,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group,
 int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 {
 	struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) };
+	enum mmop online_type = mhp_get_default_online_type();
 	enum memblock_flags memblock_flags = MEMBLOCK_NONE;
 	struct memory_group *group = NULL;
 	u64 start, size;
@@ -1585,7 +1588,8 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 
 	/* online pages if requested */
 	if (mhp_get_default_online_type() != MMOP_OFFLINE)
-		walk_memory_blocks(start, size, NULL, online_memory_block);
+		walk_memory_blocks(start, size, &online_type,
+				   online_memory_block);
 
 	return ret;
 error: