+ mm-hugetlb-convert-hugetlb_change_protection-to-folios.patch added to mm-new branch

+ mm-hugetlb-convert-hugetlb_change_protection-to-folios.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/hugetlb: convert hugetlb_change_protection() to folios
has been added to the -mm mm-new branch.  Its filename is
     mm-hugetlb-convert-hugetlb_change_protection-to-folios.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-convert-hugetlb_change_protection-to-folios.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
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fixup patches in mm-new.

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------------------------------------------------------
From: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Subject: mm/hugetlb: convert hugetlb_change_protection() to folios
Date: Wed, 28 May 2025 15:20:13 -0400

The for loop inside hugetlb_change_protection() increments by the huge
page size:

psize = huge_page_size(h);
for (; address < end; address += psize)

so we are operating on the head page of the huge pages between address and
end.  We can safely convert the struct page usage to struct folio.

Link: https://lkml.kernel.org/r/20250528192013.91130-1-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: 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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/hugetlb.c~mm-hugetlb-convert-hugetlb_change_protection-to-folios
+++ a/mm/hugetlb.c
@@ -7186,11 +7186,11 @@ long hugetlb_change_protection(struct vm
 			/* Nothing to do. */
 		} else if (unlikely(is_hugetlb_entry_migration(pte))) {
 			swp_entry_t entry = pte_to_swp_entry(pte);
-			struct page *page = pfn_swap_entry_to_page(entry);
+			struct folio *folio = pfn_swap_entry_folio(entry);
 			pte_t newpte = pte;
 
 			if (is_writable_migration_entry(entry)) {
-				if (PageAnon(page))
+				if (folio_test_anon(folio))
 					entry = make_readable_exclusive_migration_entry(
 								swp_offset(entry));
 				else
_

Patches currently in -mm which might be from sidhartha.kumar@oracle.com are

mm-hugetlb-convert-hugetlb_change_protection-to-folios.patch