linux-kernel - [PATCH v1 26/26] mm: lru: add VM_WARN_ON_ONCE

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Message-ID: <7c59a234362d080af554061941983588feffce01.1761658311.git.zhengqi.arch@bytedance.com>
Date: Tue, 28 Oct 2025 21:58:39 +0800
From: Qi Zheng <qi.zheng@...ux.dev>
To: hannes@...xchg.org,
	hughd@...gle.com,
	mhocko@...e.com,
	roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev,
	muchun.song@...ux.dev,
	david@...hat.com,
	lorenzo.stoakes@...cle.com,
	ziy@...dia.com,
	harry.yoo@...cle.com,
	imran.f.khan@...cle.com,
	kamalesh.babulal@...cle.com,
	axelrasmussen@...gle.com,
	yuanchu@...gle.com,
	weixugc@...gle.com,
	akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org,
	Muchun Song <songmuchun@...edance.com>,
	Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v1 26/26] mm: lru: add VM_WARN_ON_ONCE_FOLIO to lru maintenance helpers

From: Muchun Song <songmuchun@...edance.com>

We must ensure the folio is deleted from or added to the correct lruvec
list. So, add VM_WARN_ON_ONCE_FOLIO() to catch invalid users. The
VM_BUG_ON_PAGE() in move_pages_to_lru() can be removed as
add_page_to_lru_list() will perform the necessary check.

Signed-off-by: Muchun Song <songmuchun@...edance.com>
Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 include/linux/mm_inline.h | 6 ++++++
 mm/vmscan.c               | 1 -
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index f6a2b2d200162..dfed0523e0c43 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -342,6 +342,8 @@ void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
 {
 	enum lru_list lru = folio_lru_list(folio);
 
+	VM_WARN_ON_ONCE_FOLIO(!folio_matches_lruvec(folio, lruvec), folio);
+
 	if (lru_gen_add_folio(lruvec, folio, false))
 		return;
 
@@ -356,6 +358,8 @@ void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
 {
 	enum lru_list lru = folio_lru_list(folio);
 
+	VM_WARN_ON_ONCE_FOLIO(!folio_matches_lruvec(folio, lruvec), folio);
+
 	if (lru_gen_add_folio(lruvec, folio, true))
 		return;
 
@@ -370,6 +374,8 @@ void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
 {
 	enum lru_list lru = folio_lru_list(folio);
 
+	VM_WARN_ON_ONCE_FOLIO(!folio_matches_lruvec(folio, lruvec), folio);
+
 	if (lru_gen_del_folio(lruvec, folio, false))
 		return;
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 82c4cc6edbca5..5f22ec438c018 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1934,7 +1934,6 @@ static unsigned int move_folios_to_lru(struct list_head *list)
 			continue;
 		}
 
-		VM_BUG_ON_FOLIO(!folio_matches_lruvec(folio, lruvec), folio);
 		lruvec_add_folio(lruvec, folio);
 		nr_pages = folio_nr_pages(folio);
 		nr_moved += nr_pages;
-- 
2.20.1