linux-kernel - [PATCH v2] mm/swap_state: update zswap LRU's protection range with the folio locked (fix)

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Message-Id: <20240206191355.83755-1-nphamcs@gmail.com>
Date: Tue,  6 Feb 2024 11:13:55 -0800
From: Nhat Pham <nphamcs@...il.com>
To: akpm@...ux-foundation.org
Cc: hannes@...xchg.org,
	chengming.zhou@...ux.dev,
	yosryahmed@...gle.com,
	linux-mm@...ck.org,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] mm/swap_state: update zswap LRU's protection range with the folio locked (fix)

The if (folio) checks inside zswap_folio_swapin() is no longer needed.

Suggested-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Nhat Pham <nphamcs@...il.com>
---
 mm/zswap.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 8c548f73d52e..e91e3f10a5c8 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -826,11 +826,9 @@ void zswap_folio_swapin(struct folio *folio)
 {
 	struct lruvec *lruvec;
 
-	if (folio) {
-		VM_WARN_ON_ONCE(!folio_test_locked(folio));
-		lruvec = folio_lruvec(folio);
-		atomic_long_inc(&lruvec->zswap_lruvec_state.nr_zswap_protected);
-	}
+	VM_WARN_ON_ONCE(!folio_test_locked(folio));
+	lruvec = folio_lruvec(folio);
+	atomic_long_inc(&lruvec->zswap_lruvec_state.nr_zswap_protected);
 }
 
 void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg)
-- 
2.39.3