linux-kernel - [PATCH] mm/hugetlb: convert hugetlb_change

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Message-ID: <20250528192013.91130-1-sidhartha.kumar@oracle.com>
Date: Wed, 28 May 2025 15:20:13 -0400
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, willy@...radead.org,
        muchun.song@...ux.dev, osalvador@...e.de,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH] mm/hugetlb: convert hugetlb_change_protection() to folios

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.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 mm/hugetlb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index df1759e0b7fe..25d3768c6eca 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -7185,11 +7185,11 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
 			/* 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
-- 
2.43.0