[PATCH v6 3/5] drivers/base/node: Remove register_memory_blocks_under_node() function call from register_one_node

[Donet Tom]

register_one_node() is now only called via cpu_up() → __try_online_node()
during CPU hotplug operations to online a node.

At this stage, the node has not yet had any memory added. As a result,
there are no memory blocks to walk or register, so calling
register_memory_blocks_under_node() is unnecessary.

Therefore, the call to register_memory_blocks_under_node()
has been removed from register_one_node().

Acked-by: Oscar Salvador <osalvador at suse.de>
Acked-by: Mike Rapoport (Microsoft) <rppt at kernel.org>
Acked-by: David Hildenbrand <david at redhat.com>
Signed-off-by: Donet Tom <donettom at linux.ibm.com>

---

v5 -> v6

Removed node_online() check.

v5 - https://lore.kernel.org/all/d2490e807b2c13950bc1d4199f22ec078cc4c56a.1747904868.git.donettom@linux.ibm.com/
v4 - https://lore.kernel.org/all/f94685be9cdc931a026999d236d7e92de29725c7.1747376551.git.donettom@linux.ibm.com/
v3 - https://lore.kernel.org/all/b49ed289096643ff5b5fbedcf1d1c1be42845a74.1746250339.git.donettom@linux.ibm.com/
v2 - https://lore.kernel.org/all/fbe1e0c7d91bf3fa9a64ff5d84b53ded1d0d5ac7.1745852397.git.donettom@linux.ibm.com/
v1 - https://lore.kernel.org/all/50142a29010463f436dc5c4feb540e5de3bb09df.1744175097.git.donettom@linux.ibm.com/
---
---
 include/linux/node.h | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/include/linux/node.h b/include/linux/node.h
index 485370f3bc17..b15de78e0408 100644
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -134,21 +134,7 @@ extern int __register_one_node(int nid);
 /* Registers an online node */
 static inline int register_one_node(int nid)
 {
-	int error = 0;
-
-	if (node_online(nid)) {
-		struct pglist_data *pgdat = NODE_DATA(nid);
-		unsigned long start_pfn = pgdat->node_start_pfn;
-		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
-
-		error = __register_one_node(nid);
-		if (error)
-			return error;
-		register_memory_blocks_under_node(nid, start_pfn, end_pfn,
-						  MEMINIT_EARLY);
-	}
-
-	return error;
+	return __register_one_node(nid);
 }
 
 extern void unregister_one_node(int nid);
-- 
2.43.5