linux-kernel - [PATCH v3 5/8] mm: memcontrol: rename lruvec_holds_page_lru_lock to page_matches

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Date:   Sat, 17 Apr 2021 12:35:35 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     guro@...com, hannes@...xchg.org, mhocko@...nel.org,
        akpm@...ux-foundation.org, shakeelb@...gle.com,
        vdavydov.dev@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        duanxiongchun@...edance.com,
        Muchun Song <songmuchun@...edance.com>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH v3 5/8] mm: memcontrol: rename lruvec_holds_page_lru_lock to page_matches_lruvec

lruvec_holds_page_lru_lock() doesn't check anything about locking and is
used to check whether the page belongs to the lruvec. So rename it to
page_matches_lruvec().

Signed-off-by: Muchun Song <songmuchun@...edance.com>
Acked-by: Michal Hocko <mhocko@...e.com>
Acked-by: Johannes Weiner <hannes@...xchg.org>
Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
---
 include/linux/memcontrol.h | 8 ++++----
 mm/vmscan.c                | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 2fc728492c9b..0ce97eff79e2 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1492,8 +1492,8 @@ static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
 	spin_unlock_irqrestore(&lruvec->lru_lock, flags);
 }
 
-static inline bool lruvec_holds_page_lru_lock(struct page *page,
-					      struct lruvec *lruvec)
+/* Test requires a stable page->memcg binding, see page_memcg() */
+static inline bool page_matches_lruvec(struct page *page, struct lruvec *lruvec)
 {
 	return lruvec_pgdat(lruvec) == page_pgdat(page) &&
 	       lruvec_memcg(lruvec) == page_memcg(page);
@@ -1504,7 +1504,7 @@ static inline struct lruvec *relock_page_lruvec_irq(struct page *page,
 		struct lruvec *locked_lruvec)
 {
 	if (locked_lruvec) {
-		if (lruvec_holds_page_lru_lock(page, locked_lruvec))
+		if (page_matches_lruvec(page, locked_lruvec))
 			return locked_lruvec;
 
 		unlock_page_lruvec_irq(locked_lruvec);
@@ -1518,7 +1518,7 @@ static inline struct lruvec *relock_page_lruvec_irqsave(struct page *page,
 		struct lruvec *locked_lruvec, unsigned long *flags)
 {
 	if (locked_lruvec) {
-		if (lruvec_holds_page_lru_lock(page, locked_lruvec))
+		if (page_matches_lruvec(page, locked_lruvec))
 			return locked_lruvec;
 
 		unlock_page_lruvec_irqrestore(locked_lruvec, *flags);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bb8321026c0c..2bc5cf409958 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2062,7 +2062,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 		 * All pages were isolated from the same lruvec (and isolation
 		 * inhibits memcg migration).
 		 */
-		VM_BUG_ON_PAGE(!lruvec_holds_page_lru_lock(page, lruvec), page);
+		VM_BUG_ON_PAGE(!page_matches_lruvec(page, lruvec), page);
 		add_page_to_lru_list(page, lruvec);
 		nr_pages = thp_nr_pages(page);
 		nr_moved += nr_pages;
-- 
2.11.0