From: David Hildenbrand (Arm) <david@kernel.org>
Date: Fri, 20 Mar 2026 22:13:39 +0000 (+0100)
Subject: mm/bootmem_info: remove handling for !CONFIG_SPARSEMEM_VMEMMAP
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=41293414433a0d033ef1b7f95441e347c8f513c3;p=thirdparty%2Fkernel%2Flinux.git

mm/bootmem_info: remove handling for !CONFIG_SPARSEMEM_VMEMMAP

It is not immediately obvious that CONFIG_HAVE_BOOTMEM_INFO_NODE is only
selected from CONFIG_MEMORY_HOTREMOVE, which itself depends on
CONFIG_MEMORY_HOTPLUG that ...  depends on CONFIG_SPARSEMEM_VMEMMAP.

Let's remove the !CONFIG_SPARSEMEM_VMEMMAP leftovers that are dead code.

Link: https://lkml.kernel.org/r/20260320-sparsemem_cleanups-v2-7-096addc8800d@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>
---

diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c
index b0e2a9fa641ff..e61e08e249246 100644
--- a/mm/bootmem_info.c
+++ b/mm/bootmem_info.c
@@ -40,42 +40,6 @@ void put_page_bootmem(struct page *page)
 	}
 }
 
-#ifndef CONFIG_SPARSEMEM_VMEMMAP
-static void __init register_page_bootmem_info_section(unsigned long start_pfn)
-{
-	unsigned long mapsize, section_nr, i;
-	struct mem_section *ms;
-	struct page *page, *memmap;
-	struct mem_section_usage *usage;
-
-	section_nr = pfn_to_section_nr(start_pfn);
-	ms = __nr_to_section(section_nr);
-
-	/* Get section's memmap address */
-	memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
-
-	/*
-	 * Get page for the memmap's phys address
-	 * XXX: need more consideration for sparse_vmemmap...
-	 */
-	page = virt_to_page(memmap);
-	mapsize = sizeof(struct page) * PAGES_PER_SECTION;
-	mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
-
-	/* remember memmap's page */
-	for (i = 0; i < mapsize; i++, page++)
-		get_page_bootmem(section_nr, page, SECTION_INFO);
-
-	usage = ms->usage;
-	page = virt_to_page(usage);
-
-	mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
-
-	for (i = 0; i < mapsize; i++, page++)
-		get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
-
-}
-#else /* CONFIG_SPARSEMEM_VMEMMAP */
 static void __init register_page_bootmem_info_section(unsigned long start_pfn)
 {
 	unsigned long mapsize, section_nr, i;
@@ -100,7 +64,6 @@ static void __init register_page_bootmem_info_section(unsigned long start_pfn)
 	for (i = 0; i < mapsize; i++, page++)
 		get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
 }
-#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
 
 void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
 {