[merged mm-stable] mm-bootmem_info-avoid-using-sparse_decode_mem_map.patch removed from -mm tree

[merged mm-stable] mm-bootmem_info-avoid-using-sparse_decode_mem_map.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/bootmem_info: avoid using sparse_decode_mem_map()
has been removed from the -mm tree.  Its filename was
     mm-bootmem_info-avoid-using-sparse_decode_mem_map.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "David Hildenbrand (Arm)" <david@kernel.org>
Subject: mm/bootmem_info: avoid using sparse_decode_mem_map()
Date: Fri, 20 Mar 2026 23:13:40 +0100

With SPARSEMEM_VMEMMAP, we can just do a pfn_to_page().  It is not super
clear whether the start_pfn is properly aligned ...  so let's just make
sure it is properly aligned to the start of the section.

We will soon might try to remove the bootmem info completely, for now,
just keep it working as is.

Link: https://lkml.kernel.org/r/20260320-sparsemem_cleanups-v2-8-096addc8800d@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/bootmem_info.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

--- a/mm/bootmem_info.c~mm-bootmem_info-avoid-using-sparse_decode_mem_map
+++ a/mm/bootmem_info.c
@@ -44,17 +44,16 @@ static void __init register_page_bootmem
 {
 	unsigned long mapsize, section_nr, i;
 	struct mem_section *ms;
-	struct page *page, *memmap;
 	struct mem_section_usage *usage;
+	struct page *page;
 
+	start_pfn = SECTION_ALIGN_DOWN(start_pfn);
 	section_nr = pfn_to_section_nr(start_pfn);
 	ms = __nr_to_section(section_nr);
 
-	memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
-
 	if (!preinited_vmemmap_section(ms))
-		register_page_bootmem_memmap(section_nr, memmap,
-				PAGES_PER_SECTION);
+		register_page_bootmem_memmap(section_nr, pfn_to_page(start_pfn),
+					     PAGES_PER_SECTION);
 
 	usage = ms->usage;
 	page = virt_to_page(usage);
_

Patches currently in -mm which might be from david@kernel.org are