[PATCH v14-fix 03/11] mm: multi-gen LRU: warn on !ptep_test_and_clear_young()

[Yu Zhao <yuzhao@google.com>]

Link: https://lore.kernel.org/r/0F7CF2A7-F671-4196-B8FD-F35E9556391B@gmail.com/
Suggested-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Yu Zhao <yuzhao@google.com>
---
 mm/vmscan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5c4d9d0867ec..629518813b59 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3904,7 +3904,7 @@ static bool walk_pte_range(pmd_t *pmd, unsigned long start, unsigned long end,
 			continue;
 
 		if (!ptep_test_and_clear_young(args->vma, addr, pte + i))
-			continue;
+			VM_WARN_ON_ONCE(true);
 
 		young++;
 		walk->mm_stats[MM_LEAF_YOUNG]++;
@@ -4637,7 +4637,7 @@ void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
 			continue;
 
 		if (!ptep_test_and_clear_young(pvmw->vma, addr, pte + i))
-			continue;
+			VM_WARN_ON_ONCE(true);
 
 		young++;
 
-- 
2.37.3.968.ga6b4b080e4-goog