+ vmcoreinfo-export-section_has_mem_map.patch added to mm-unstable branch

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

The patch titled
     Subject: vmcoreinfo: export SECTION_HAS_MEM_MAP
has been added to the -mm mm-unstable branch.  Its filename is
     vmcoreinfo-export-section_has_mem_map.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/vmcoreinfo-export-section_has_mem_map.patch

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

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------------------------------------------------------
From: "David Hildenbrand (Arm)" <david@kernel.org>
Subject: vmcoreinfo: export SECTION_HAS_MEM_MAP
Date: Mon, 28 Sep 2026 10:48:21 +0200

The crash tool currently hardcodes SECTION_HAS_MEM_MAP, and makedumpfile
needs similar information (although still relying on
SECTION_MARKED_PRESENT, it should switch to SECTION_HAS_MEM_MAP).

Let's just export the value instead, so tools that work on vmcoreinfo
will not have to guess.

Link: https://lore.kernel.org/20260928-section_has_mem_map-v1-1-4129f6ba2838@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Baoquan He <baoquan.he@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: David Carlier <devnexen@gmail.com>
Cc: Dave Young <ruirui.yang@linux.dev>
Cc: Kazuhito Hagio <kazuhito.hagio@nec.com>
---

 kernel/vmcore_info.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/vmcore_info.c~vmcoreinfo-export-section_has_mem_map
+++ a/kernel/vmcore_info.c
@@ -182,6 +182,7 @@ static int __init crash_save_vmcoreinfo_
 	VMCOREINFO_STRUCT_SIZE(mem_section);
 	VMCOREINFO_OFFSET(mem_section, section_mem_map);
 	VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
+	VMCOREINFO_NUMBER(SECTION_HAS_MEM_MAP);
 	VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
 #endif
 	VMCOREINFO_STRUCT_SIZE(page);
_

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

arm64-mm-move-__check_safe_pte_update-fix.patch
mm-sparse-move-mem_section-init-to-sparse_extreme_init.patch
mm-sparse-refactor-sparse_sections_init.patch
mm-sparse-move-initialization-of-section-metadata-to-sparse_metadata_init.patch
mm-sparse-rename-and-cleanup-sparse_init_nid.patch
mm-sparse-cleanup-sparse_init_one_section.patch
mm-sparse-rename-__highest_present_section_nr-to-__highest_used_section_nr.patch
mm-sparse-remove-pfn_in_present_section.patch
mm-sparse-move-__highest_used_section_nr-handling.patch
scripts-gdb-mmpy-remove-fallbacks-for-section_has_mem_map-and-section_is_early.patch
mm-sparse-remove-section_marked_present.patch
mm-sparse-remove-flags-parameter-from-sparse_init_one_section.patch
fs-proc-page-clarify-comment-in-get_max_dump_pfn.patch
mm-memory_hotplug-drop-config_have_arch_pfn_valid-handling-from-pfn_to_online_page.patch
vmcoreinfo-export-section_has_mem_map.patch