[PATCH] vmcoreinfo: export SECTION_HAS_MEM_MAP

[David Hildenbrand (Arm)]

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.

Signed-off-by: David Hildenbrand (Arm) <david@xxxxxxxxxx>
---
Result of the discussion in reply to "[PATCH v2 00/13] mm/sparse: remove
SECTION_MARKED_PRESENT and further cleanups" [1]

This patch can go in independently. It would be preferable if both
go into the same kernel release ;)

[1] https://lore.kernel.org/r/20260921-b4-sparsemem_cleanups-v2-0-54d81d65e125@xxxxxxxxxx 
---
 kernel/vmcore_info.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c
index 5a417f8a922a..7833a36064a8 100644
--- a/kernel/vmcore_info.c
+++ b/kernel/vmcore_info.c
@@ -182,6 +182,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	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);

---

base-commit: 57e4ac91fc62d75d84b5a03827a19ceb4094ecd9

change-id: 20260928-section_has_mem_map-6205dc90a09f

--

Cheers,

David