+ mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch added to mm-new branch

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

The patch titled
     Subject: mm: debug_vm_pgtable: add debug_vm_pgtable_free_huge_page()
has been added to the -mm mm-new branch.  Its filename is
     mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch

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

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patches, and acceptance into mm-new is a notification for others take
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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: mm: debug_vm_pgtable: add debug_vm_pgtable_free_huge_page()
Date: Thu, 23 Oct 2025 19:59:35 +0800

Patch series "mm: hugetlb: allocate frozen gigantic folio", v4.

Introduce alloc_contig_frozen_pages() and cma_alloc_frozen_compound()
which avoid atomic operation about page refcount, and then convert to
allocate frozen gigantic folio by the new helpers in hugetlb to cleanup
the alloc_gigantic_folio().


This patch (of 6):

Add a new helper to free huge page to be consistency to
debug_vm_pgtable_alloc_huge_page(), and use HPAGE_PUD_ORDER instead of
open-code.

Also move the free_contig_range() under CONFIG_ALLOC_CONTIG since all
caller are built with CONFIG_ALLOC_CONTIG.

Link: https://lkml.kernel.org/r/20251023115940.3573158-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20251023115940.3573158-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/gfp.h   |    2 +-
 mm/debug_vm_pgtable.c |   38 +++++++++++++++++---------------------
 mm/page_alloc.c       |    2 +-
 3 files changed, 19 insertions(+), 23 deletions(-)

--- a/include/linux/gfp.h~mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page
+++ a/include/linux/gfp.h
@@ -438,8 +438,8 @@ extern struct page *alloc_contig_pages_n
 					      int nid, nodemask_t *nodemask);
 #define alloc_contig_pages(...)			alloc_hooks(alloc_contig_pages_noprof(__VA_ARGS__))
 
-#endif
 void free_contig_range(unsigned long pfn, unsigned long nr_pages);
+#endif
 
 #ifdef CONFIG_CONTIG_ALLOC
 static inline struct folio *folio_alloc_gigantic_noprof(int order, gfp_t gfp,
--- a/mm/debug_vm_pgtable.c~mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page
+++ a/mm/debug_vm_pgtable.c
@@ -958,22 +958,26 @@ static unsigned long __init get_random_v
 	return random_vaddr;
 }
 
-static void __init destroy_args(struct pgtable_debug_args *args)
+static void __init
+debug_vm_pgtable_free_huge_page(struct pgtable_debug_args *args,
+		unsigned long pfn, int order)
 {
-	struct page *page = NULL;
+#ifdef CONFIG_CONTIG_ALLOC
+	if (args->is_contiguous_page) {
+		free_contig_range(pfn, 1 << order);
+		return;
+	}
+#endif
+	__free_pages(pfn_to_page(pfn), order);
+}
 
+static void __init destroy_args(struct pgtable_debug_args *args)
+{
 	/* Free (huge) page */
 	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 	    has_transparent_pud_hugepage() &&
 	    args->pud_pfn != ULONG_MAX) {
-		if (args->is_contiguous_page) {
-			free_contig_range(args->pud_pfn,
-					  (1 << (HPAGE_PUD_SHIFT - PAGE_SHIFT)));
-		} else {
-			page = pfn_to_page(args->pud_pfn);
-			__free_pages(page, HPAGE_PUD_SHIFT - PAGE_SHIFT);
-		}
-
+		debug_vm_pgtable_free_huge_page(args, args->pud_pfn, HPAGE_PUD_ORDER);
 		args->pud_pfn = ULONG_MAX;
 		args->pmd_pfn = ULONG_MAX;
 		args->pte_pfn = ULONG_MAX;
@@ -982,20 +986,13 @@ static void __init destroy_args(struct p
 	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 	    has_transparent_hugepage() &&
 	    args->pmd_pfn != ULONG_MAX) {
-		if (args->is_contiguous_page) {
-			free_contig_range(args->pmd_pfn, (1 << HPAGE_PMD_ORDER));
-		} else {
-			page = pfn_to_page(args->pmd_pfn);
-			__free_pages(page, HPAGE_PMD_ORDER);
-		}
-
+		debug_vm_pgtable_free_huge_page(args, args->pmd_pfn, HPAGE_PMD_ORDER);
 		args->pmd_pfn = ULONG_MAX;
 		args->pte_pfn = ULONG_MAX;
 	}
 
 	if (args->pte_pfn != ULONG_MAX) {
-		page = pfn_to_page(args->pte_pfn);
-		__free_page(page);
+		__free_page(pfn_to_page(args->pte_pfn));
 
 		args->pte_pfn = ULONG_MAX;
 	}
@@ -1227,8 +1224,7 @@ static int __init init_args(struct pgtab
 	 */
 	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 	    has_transparent_pud_hugepage()) {
-		page = debug_vm_pgtable_alloc_huge_page(args,
-				HPAGE_PUD_SHIFT - PAGE_SHIFT);
+		page = debug_vm_pgtable_alloc_huge_page(args, HPAGE_PUD_ORDER);
 		if (page) {
 			args->pud_pfn = page_to_pfn(page);
 			args->pmd_pfn = args->pud_pfn;
--- a/mm/page_alloc.c~mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page
+++ a/mm/page_alloc.c
@@ -7151,7 +7151,6 @@ struct page *alloc_contig_pages_noprof(u
 	}
 	return NULL;
 }
-#endif /* CONFIG_CONTIG_ALLOC */
 
 void free_contig_range(unsigned long pfn, unsigned long nr_pages)
 {
@@ -7178,6 +7177,7 @@ void free_contig_range(unsigned long pfn
 	WARN(count != 0, "%lu pages are still in use!\n", count);
 }
 EXPORT_SYMBOL(free_contig_range);
+#endif /* CONFIG_CONTIG_ALLOC */
 
 /*
  * Effectively disable pcplists for the zone by setting the high limit to 0
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-mprotect-always-skip-dma-pinned-folio-in-prot_numa_skip.patch
mm-mprotect-avoid-unnecessary-struct-page-accessing-if-pte_protnone.patch
mm-huge_memory-use-folio_skip_prot_numa-for-pmd-folio.patch
mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch
mm-page_alloc-add-__split_page.patch
mm-cma-add-__cma_release.patch
mm-page_alloc-add-alloc_contig_frozen_rangepages.patch
mm-cma-add-cma_alloc_frozen_compound.patch
mm-hugetlb-allocate-frozen-pages-in-alloc_gigantic_folio.patch