linux-kernel - [PATCH RESEND] mm/vmscan: remove redundant folio_test

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Message-ID: <20250811182500.42670-1-wjl.linux@gmail.com>
Date: Tue, 12 Aug 2025 02:25:00 +0800
From: Jialin Wang <wjl.linux@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	David Hildenbrand <david@...hat.com>,
	Michal Hocko <mhocko@...nel.org>,
	Qi Zheng <zhengqi.arch@...edance.com>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Jialin Wang <wjl.linux@...il.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH RESEND] mm/vmscan: remove redundant folio_test_swapbacked()

When !folio_is_file_lru(folio) is false, it implies that
!folio_test_swapbacked(folio) must be true. Therefore, the additional
check for !folio_test_swapbacked(folio) is redundant and can be safely
removed.

This cleanup simplifies the code without changing any functionality.

Signed-off-by: Jialin Wang <wjl.linux@...il.com>
---
 mm/vmscan.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7de11524a936..9d4745ad5e23 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -985,8 +985,7 @@ static void folio_check_dirty_writeback(struct folio *folio,
 	 * They could be mistakenly treated as file lru. So further anon
 	 * test is needed.
 	 */
-	if (!folio_is_file_lru(folio) ||
-	    (folio_test_anon(folio) && !folio_test_swapbacked(folio))) {
+	if (!folio_is_file_lru(folio) || folio_test_anon(folio)) {
 		*dirty = false;
 		*writeback = false;
 		return;
-- 
2.50.0