+ mm-hugetlb-localize-struct-huge_bootmem_page.patch added to mm-new branch

+ mm-hugetlb-localize-struct-huge_bootmem_page.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/hugetlb: localize struct huge_bootmem_page
has been added to the -mm mm-new branch.  Its filename is
     mm-hugetlb-localize-struct-huge_bootmem_page.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-localize-struct-huge_bootmem_page.patch

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

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Muchun Song <songmuchun@bytedance.com>
Subject: mm/hugetlb: localize struct huge_bootmem_page
Date: Tue, 25 Aug 2026 16:46:07 +0800

struct huge_bootmem_page is only used by hugetlb boot-time allocation
code, but its definition currently lives in mm/internal.h because
hugetlb_vmemmap_optimize_bootmem_page() takes it as an argument.  This
exposes a hugetlb-specific internal type more broadly than needed.

Change hugetlb_vmemmap_optimize_bootmem_page() to take the information it
actually needs.  With that interface, mm/hugetlb_vmemmap.h no longer needs
to include mm/internal.h, and struct huge_bootmem_page can move into
mm/hugetlb.c.

Link: https://lore.kernel.org/20260825084608.47437-17-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Qi Zheng <qi.zheng@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Laight <david.laight.linux@gmail.com>
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: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c         |    8 +++++++-
 mm/hugetlb_vmemmap.c |    8 +++-----
 mm/hugetlb_vmemmap.h |    5 ++---
 mm/internal.h        |    7 -------
 4 files changed, 12 insertions(+), 16 deletions(-)

--- a/mm/hugetlb.c~mm-hugetlb-localize-struct-huge_bootmem_page
+++ a/mm/hugetlb.c
@@ -55,6 +55,12 @@
 #include "sparse.h"
 #include <linux/page-isolation.h>
 
+struct huge_bootmem_page {
+	struct list_head list;
+	struct hstate *hstate;
+	unsigned long flags;
+};
+
 int hugetlb_max_hstate __read_mostly;
 unsigned int default_hstate_idx;
 struct hstate hstates[HUGE_MAX_HSTATE];
@@ -3142,7 +3148,7 @@ static bool __init alloc_bootmem_huge_pa
 	} else {
 		list_add_tail(&m->list, &huge_boot_pages[nid]);
 		m->flags |= HUGE_BOOTMEM_ZONES_VALID;
-		hugetlb_vmemmap_optimize_bootmem_page(m);
+		hugetlb_vmemmap_optimize_bootmem_page(pfn, huge_page_order(h));
 		/*
 		 * Only initialize the head struct page in memmap_init_reserved_pages,
 		 * rest of the struct pages will be initialized by the HugeTLB
--- a/mm/hugetlb_vmemmap.c~mm-hugetlb-localize-struct-huge_bootmem_page
+++ a/mm/hugetlb_vmemmap.c
@@ -19,6 +19,7 @@
 #include <asm/tlbflush.h>
 #include "hugetlb_vmemmap.h"
 #include "sparse.h"
+#include "internal.h"
 
 /**
  * struct vmemmap_remap_walk - walk vmemmap page table
@@ -705,15 +706,12 @@ void hugetlb_vmemmap_optimize_bootmem_fo
 	__hugetlb_vmemmap_optimize_folios(h, folio_list, true);
 }
 
-void __init hugetlb_vmemmap_optimize_bootmem_page(struct huge_bootmem_page *m)
+void __init hugetlb_vmemmap_optimize_bootmem_page(unsigned long pfn, unsigned int order)
 {
-	struct hstate *h = m->hstate;
-	unsigned long pfn = PHYS_PFN(__pa(m));
-
 	if (!READ_ONCE(vmemmap_optimize_enabled))
 		return;
 
-	section_set_order_range(pfn, pages_per_huge_page(h), huge_page_order(h));
+	section_set_order_range(pfn, 1UL << order, order);
 }
 
 static const struct ctl_table hugetlb_vmemmap_sysctls[] = {
--- a/mm/hugetlb_vmemmap.h~mm-hugetlb-localize-struct-huge_bootmem_page
+++ a/mm/hugetlb_vmemmap.h
@@ -9,7 +9,6 @@
 #ifndef _LINUX_HUGETLB_VMEMMAP_H
 #define _LINUX_HUGETLB_VMEMMAP_H
 #include <linux/hugetlb.h>
-#include "internal.h"
 
 /*
  * Reserve one vmemmap page, all vmemmap addresses are mapped to it. See
@@ -26,7 +25,7 @@ long hugetlb_vmemmap_restore_folios(cons
 void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio);
 void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list);
 void hugetlb_vmemmap_optimize_bootmem_folios(struct hstate *h, struct list_head *folio_list);
-void hugetlb_vmemmap_optimize_bootmem_page(struct huge_bootmem_page *m);
+void hugetlb_vmemmap_optimize_bootmem_page(unsigned long pfn, unsigned int order);
 
 static inline unsigned int hugetlb_vmemmap_size(const struct hstate *h)
 {
@@ -77,7 +76,7 @@ static inline unsigned int hugetlb_vmemm
 	return 0;
 }
 
-static inline void hugetlb_vmemmap_optimize_bootmem_page(struct huge_bootmem_page *m)
+static inline void hugetlb_vmemmap_optimize_bootmem_page(unsigned long pfn, unsigned int order)
 {
 }
 #endif /* CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP */
--- a/mm/internal.h~mm-hugetlb-localize-struct-huge_bootmem_page
+++ a/mm/internal.h
@@ -23,13 +23,6 @@
 #include "vma.h"
 
 struct folio_batch;
-struct hstate;
-
-struct huge_bootmem_page {
-	struct list_head list;
-	struct hstate *hstate;
-	unsigned long flags;
-};
 
 /* mm/workingset.c */
 bool workingset_test_recent(void *shadow, bool file, bool *workingset,
_

Patches currently in -mm which might be from songmuchun@bytedance.com are

mm-sparse-relax-struct-mem_section-size-constraints.patch
mm-sparse-vmemmap-rename-hvo-order-macros.patch
mm-mm_init-skip-initializing-shared-vmemmap-tail-pages.patch
mm-sparse-vmemmap-initialize-shared-tail-vmemmap-pages-on-allocation.patch
mm-sparse-vmemmap-support-section-based-vmemmap-accounting.patch
mm-mm_init-factor-out-pfn_to_zone.patch
mm-sparse-vmemmap-move-helpers-ahead-of-future-callers.patch
mm-sparse-vmemmap-support-section-based-vmemmap-optimization.patch
mm-sparse-initialize-memory-sections-earlier.patch
mm-hugetlb-switch-hugetlb-to-section-based-vmemmap-optimization.patch
mm-sparse-vmemmap-remove-sparsemem_vmemmap_preinit-support.patch
mm-sparse-inline-usemap-allocation-into-sparse_init_nid.patch
mm-sparse-remove-section_map_size.patch
mm-hugetlb-remove-huge_bootmem_hvo.patch
mm-hugetlb-remove-huge_bootmem_cma.patch
mm-hugetlb-localize-struct-huge_bootmem_page.patch
mm-hugetlb-localize-huge_bootmem_zones_valid.patch