ANDROID: add func in mm/memcontrol.c

- page_to_lruvec: get lruvec from page and pgdat.

This patch is a partial cherry-pick of I3d4f5159faaca1ee71ffa65f2fc1341f51da637c.
The original cherry-pick did not include this part which is needed now.

Bug: 236578020
Signed-off-by: Peifeng Li <lipeifeng@oppo.com>`
Change-Id: I40b0a53a7368d6073b2637abfff316d30a56b416

include/linux/memcontrol.h

@@ -383,6 +383,7 @@ enum page_memcg_data_flags {
 static inline bool PageMemcgKmem(struct page *page);
 
 void do_traversal_all_lruvec(void);
+struct lruvec *page_to_lruvec(struct page *page, pg_data_t *pgdat);
 
 /*
  * After the initialization objcg->memcg is always pointing at
@@ -1169,6 +1170,11 @@ static inline bool PageMemcgKmem(struct page *page)
 	return false;
 }
 
+static inline struct lruvec *page_to_lruvec(struct page *page, pg_data_t *pgdat)
+{
+	return NULL;
+}
+
 static inline void do_traversal_all_lruvec(void)
 {
 }

mm/memcontrol.c

@@ -1279,6 +1279,16 @@ struct lruvec *lock_page_lruvec_irqsave(struct page *page, unsigned long *flags)
 	return lruvec;
 }
 
+struct lruvec *page_to_lruvec(struct page *page, pg_data_t *pgdat)
+{
+	struct lruvec *lruvec;
+
+	lruvec = mem_cgroup_page_lruvec(page);
+
+	return lruvec;
+}
+EXPORT_SYMBOL_GPL(page_to_lruvec);
+
 void do_traversal_all_lruvec(void)
 {
 	pg_data_t *pgdat;