linux-kernel - [PATCH v5 10/11] mm: lru: add VM_BUG_ON

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Message-Id: <20220530074919.46352-11-songmuchun@bytedance.com>
Date:   Mon, 30 May 2022 15:49:18 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...ux.dev,
        shakeelb@...gle.com, akpm@...ux-foundation.org
Cc:     cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, duanxiongchun@...edance.com,
        longman@...hat.com, Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v5 10/11] mm: lru: add VM_BUG_ON_FOLIO to lru maintenance function

We need to make sure that the page is deleted from or added to the
correct lruvec list. So add a VM_WARN_ON_ONCE_FOLIO() to catch
invalid users.  Then the VM_BUG_ON_PAGE() in move_pages_to_lru()
could be removed since add_page_to_lru_list() will check that.

Signed-off-by: Muchun Song <songmuchun@...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 ac32125745ab..e13e56c7fdbd 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -97,6 +97,8 @@ 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);
+
 	update_lru_size(lruvec, lru, folio_zonenum(folio),
 			folio_nr_pages(folio));
 	if (lru != LRU_UNEVICTABLE)
@@ -114,6 +116,8 @@ 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);
+
 	update_lru_size(lruvec, lru, folio_zonenum(folio),
 			folio_nr_pages(folio));
 	/* This is not expected to be used on LRU_UNEVICTABLE */
@@ -131,6 +135,8 @@ 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 != LRU_UNEVICTABLE)
 		list_del(&folio->lru);
 	update_lru_size(lruvec, lru, folio_zonenum(folio),
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 67f1462b150d..51853d6df7b4 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2277,7 +2277,6 @@ static unsigned int move_pages_to_lru(struct list_head *list)
 			continue;
 		}
 
-		VM_BUG_ON_PAGE(!folio_matches_lruvec(folio, lruvec), page);
 		add_page_to_lru_list(page, lruvec);
 		nr_pages = thp_nr_pages(page);
 		nr_moved += nr_pages;
-- 
2.11.0