From 69213b1b9f07bf9e9ed00341a0a5bc5f738c6dba Mon Sep 17 00:00:00 2001
From: Barry Song <21cnbao@gmail.com>
Date: Mon, 5 Aug 2024 13:53:24 +1200
Subject: [PATCH] mm-swap-allow-cache-reclaim-to-skip-slot-cache-fix

small folios should have nr_pages == 1 but not nr_page == 0

Link: https://lkml.kernel.org/r/20240805015324.45134-1-21cnbao@gmail.com
Signed-off-by: Barry Song <21cnbao@gmail.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kairui Song <ryncsn@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/swapfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 91e7e992941c0..e4c797af9586c 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -224,7 +224,7 @@ static int __try_to_reclaim_swap(struct swap_info_struct *si,
 
 	spin_lock(&si->lock);
 	/* Only sinple page folio can be backed by zswap */
-	if (!nr_pages)
+	if (nr_pages == 1)
 		zswap_invalidate(entry);
 	swap_entry_range_free(si, entry, nr_pages);
 	spin_unlock(&si->lock);
-- 
2.49.0