+ mm-bootmem_info-allow-calling-free_bootmem_page-on-pages-without-a-bootmem_type.patch added to mm-unstable branch

+ mm-bootmem_info-allow-calling-free_bootmem_page-on-pages-without-a-bootmem_type.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/bootmem_info: allow calling free_bootmem_page() on pages without a bootmem_type
has been added to the -mm mm-unstable branch.  Its filename is
     mm-bootmem_info-allow-calling-free_bootmem_page-on-pages-without-a-bootmem_type.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-bootmem_info-allow-calling-free_bootmem_page-on-pages-without-a-bootmem_type.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: mm/bootmem_info: allow calling free_bootmem_page() on pages without a bootmem_type
Date: Thu, 16 Jul 2026 16:51:03 +0200

As preparation for further changes, let's temporarily allow freeing pages
that were not previously registered.

This will allow freeing unregistered vmemmap pages allocated during boot
through free_bootmem_page() from hugetlb code, until we fully rip all of
that out.

Link: https://lore.kernel.org/20260716-bootmem_info_part2-v2-4-4afc76c73d61@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Acked-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/bootmem_info.h |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/include/linux/bootmem_info.h~mm-bootmem_info-allow-calling-free_bootmem_page-on-pages-without-a-bootmem_type
+++ a/include/linux/bootmem_info.h
@@ -44,12 +44,12 @@ static inline void free_bootmem_page(str
 {
 	enum bootmem_type type = bootmem_type(page);
 
-	VM_BUG_ON_PAGE(page_ref_count(page) != 2, page);
-
-	if (type == SECTION_INFO || type == MIX_SECTION_INFO)
+	if (type == SECTION_INFO || type == MIX_SECTION_INFO) {
+		VM_WARN_ON_PAGE(page_ref_count(page) != 2, page);
 		put_page_bootmem(page);
-	else
-		VM_BUG_ON_PAGE(1, page);
+	} else {
+		free_reserved_page(page);
+	}
 }
 #else
 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
_

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

sparc-mm-drop-custom-pte_clear_not_present_full.patch
mm-drop-pte_clear_not_present_full.patch
mm-cleanup-clear_not_present_full_ptes-and-rename-to-clear_non_present_ptes.patch
x86-mm-drop-order-parameter-from-free_pagetable.patch
mm-provide-free_reserved_pages-removing-x86-variant.patch
s390-mm-use-free_reserved_pages-in-vmem_free_pages.patch
mm-bootmem_info-allow-calling-free_bootmem_page-on-pages-without-a-bootmem_type.patch
x86-mm-stop-marking-vmemmap-as-section_info.patch
x86-mm-stop-marking-page-tables-as-mix_section_info.patch
x86-mm-remove-config_have_bootmem_info_node.patch
mm-hugetlb_vmemmap-remove-bootmem_info-leftovers.patch
mm-sparse-remove-bootmem_infoh-include.patch
mm-bootmem_info-remove-config_have_bootmem_info_node.patch
mm-standardize-printing-for-pgtable-entries.patch