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().

Link: https://lkml.kernel.org/r/20210417043538.9793-6-songmuchun@bytedance.comSigned-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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);

mm/vmscan.c

@@ -2063,7 +2063,7 @@ 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;