From b9b589111ba3bc27e24e5f3643d21581a6978775 Mon Sep 17 00:00:00 2001
From: Tal Zussman <tz2294@columbia.edu>
Date: Tue, 8 Sep 2026 11:16:33 -0400
Subject: [PATCH] mm/rmap: use folio_page_swap_entry() in
 ttu_anon_swapbacked_folio()

We already have the folio here, so use folio_page_swap_entry() instead of
going through page_swap_entry().  This saves a call to compound_head().

No functional change.

Link: https://lore.kernel.org/20260908-folio_swap_entry-v2-3-ee6d01dfa5e1@columbia.edu
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Chris Li <chrisl@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Harry Yoo <harry@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Kiryl Shutsemau <kas@kernel.org>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
---
 mm/rmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 0a3952706faf..5332c52909be 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -2147,7 +2147,7 @@ static bool ttu_anon_swapbacked_folio(struct vm_area_struct *vma,
 {
 	const bool anon_exclusive = folio_test_anon(folio) &&
 				    PageAnonExclusive(page);
-	swp_entry_t entry = page_swap_entry(page);
+	swp_entry_t entry = folio_page_swap_entry(folio, page);
 	struct mm_struct *mm = vma->vm_mm;
 
 	if (folio_dup_swap(folio, page) < 0)