linux-kernel - [PATCH 09/20] mm: zswap: simplify zswap

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Date: Mon, 29 Jan 2024 20:36:45 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nhat Pham <nphamcs@...il.com>,
	Yosry Ahmed <yosryahmed@...gle.com>,
	Chengming Zhou <zhouchengming@...edance.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 09/20] mm: zswap: simplify zswap_invalidate()

The branching is awkward and duplicates code. The comment about
writeback is also misleading: yes, the entry might have been written
back. Or it might have never been stored in zswap to begin with due to
a rejection - zswap_invalidate() is called on all exiting swap entries.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/zswap.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index cde309c539b3..082d076a758d 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -1739,15 +1739,10 @@ void zswap_invalidate(int type, pgoff_t offset)
 	struct zswap_tree *tree = swap_zswap_tree(swp_entry(type, offset));
 	struct zswap_entry *entry;
 
-	/* find */
 	spin_lock(&tree->lock);
 	entry = zswap_rb_search(&tree->rbroot, offset);
-	if (!entry) {
-		/* entry was written back */
-		spin_unlock(&tree->lock);
-		return;
-	}
-	zswap_invalidate_entry(tree, entry);
+	if (entry)
+		zswap_invalidate_entry(tree, entry);
 	spin_unlock(&tree->lock);
 }
 
-- 
2.43.0