From 7cf8c16056f149ff54dc910499fccf524bee99fb Mon Sep 17 00:00:00 2001
From: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Date: Tue, 31 Jan 2023 14:32:06 +0800
Subject: [PATCH] mm/gup: add folio to list when folio_isolate_lru() succeed

commit 643cf18a4ad126860d10e808ee5b52f785a27d61 upstream.

If we call folio_isolate_lru() successfully, we will get return value 0.
We need to add this folio to the movable_pages_list.

Link: https://lkml.kernel.org/r/20230131063206.28820-1-Kuan-Ying.Lee@mediatek.com
Fixes: db72948aa8b7 ("mm/gup.c: refactor check_and_migrate_movable_pages()")
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Andrew Yang <andrew.yang@mediatek.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 mm/gup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/gup.c b/mm/gup.c
index eb8d7baf9e4d3..028f3b4e8c3f2 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1978,7 +1978,7 @@ static unsigned long collect_longterm_unpinnable_pages(
 			drain_allow = false;
 		}
 
-		if (!folio_isolate_lru(folio))
+		if (folio_isolate_lru(folio))
 			continue;
 
 		list_add_tail(&folio->lru, movable_page_list);
-- 
2.39.5