+ drivers-base-node-remove-register_mem_block_under_node_early.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: drivers/base/node: remove register_mem_block_under_node_early()
has been added to the -mm mm-new branch.  Its filename is
     drivers-base-node-remove-register_mem_block_under_node_early.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/drivers-base-node-remove-register_mem_block_under_node_early.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Donet Tom <donettom@linux.ibm.com>
Subject: drivers/base/node: remove register_mem_block_under_node_early()
Date: Wed, 28 May 2025 12:18:01 -0500

The function register_mem_block_under_node_early() is no longer used, as
register_memory_blocks_under_node_early() now handles memory block
registration during early boot.

Removed register_mem_block_under_node_early() and get_nid_for_pfn(), the
latter was only used by the former.

Link: https://lkml.kernel.org/r/22e0c5d20f1d33a91d0436ad22d96628cf084d1b.1748452242.git.donettom@linux.ibm.com
Signed-off-by: Donet Tom <donettom@linux.ibm.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/base/node.c |   58 ------------------------------------------
 1 file changed, 1 insertion(+), 57 deletions(-)

--- a/drivers/base/node.c~drivers-base-node-remove-register_mem_block_under_node_early
+++ a/drivers/base/node.c
@@ -778,15 +778,6 @@ int unregister_cpu_under_node(unsigned i
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-static int __ref get_nid_for_pfn(unsigned long pfn)
-{
-#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
-	if (system_state < SYSTEM_RUNNING)
-		return early_pfn_to_nid(pfn);
-#endif
-	return pfn_to_nid(pfn);
-}
-
 static void do_register_memory_block_under_node(int nid,
 						struct memory_block *mem_blk,
 						enum meminit_context context)
@@ -813,46 +804,6 @@ static void do_register_memory_block_und
 				    ret);
 }
 
-/* register memory section under specified node if it spans that node */
-static int register_mem_block_under_node_early(struct memory_block *mem_blk,
-					       void *arg)
-{
-	unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
-	unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
-	unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
-	int nid = *(int *)arg;
-	unsigned long pfn;
-
-	for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
-		int page_nid;
-
-		/*
-		 * memory block could have several absent sections from start.
-		 * skip pfn range from absent section
-		 */
-		if (!pfn_in_present_section(pfn)) {
-			pfn = round_down(pfn + PAGES_PER_SECTION,
-					 PAGES_PER_SECTION) - 1;
-			continue;
-		}
-
-		/*
-		 * We need to check if page belongs to nid only at the boot
-		 * case because node's ranges can be interleaved.
-		 */
-		page_nid = get_nid_for_pfn(pfn);
-		if (page_nid < 0)
-			continue;
-		if (page_nid != nid)
-			continue;
-
-		do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY);
-		return 0;
-	}
-	/* mem section does not span the specified node */
-	return 0;
-}
-
 /*
  * During hotplug we know that all pages in the memory block belong to the same
  * node.
@@ -913,15 +864,8 @@ void register_memory_blocks_under_node(i
 				       unsigned long end_pfn,
 				       enum meminit_context context)
 {
-	walk_memory_blocks_func_t func;
-
-	if (context == MEMINIT_HOTPLUG)
-		func = register_mem_block_under_node_hotplug;
-	else
-		func = register_mem_block_under_node_early;
-
 	walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
-			   (void *)&nid, func);
+			   (void *)&nid, register_mem_block_under_node_hotplug);
 	return;
 }
 #endif /* CONFIG_MEMORY_HOTPLUG */
_

Patches currently in -mm which might be from donettom@linux.ibm.com are

drivers-base-node-optimize-memory-block-registration-to-reduce-boot-time.patch
drivers-base-node-remove-register_mem_block_under_node_early.patch
drivers-base-node-remove-register_memory_blocks_under_node-function-call-from-register_one_node.patch
drivers-base-node-rename-register_memory_blocks_under_node-and-remove-context-argument.patch
drivers-base-node-rename-__register_one_node-to-register_one_node.patch