[RFC PATCH v2 03/18] mm: memcontrol: remove the pgdata parameter of mem_cgroup_page_lruvec

[Muchun Song]

All the callers of mem_cgroup_page_lruvec() just pass page_pgdat(page)
as the 2nd parameter to it (except isolate_migratepages_block()). But
for isolate_migratepages_block(), the page_pgdat(page) is also equal
to the local variable of @pgdat. So mem_cgroup_page_lruvec() do not
need the pgdat parameter. Just remove it to simplify the code.

Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 include/linux/memcontrol.h | 10 +++++-----
 mm/compaction.c            |  2 +-
 mm/memcontrol.c            |  9 +++------
 mm/swap.c                  |  2 +-
 mm/workingset.c            |  2 +-
 5 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index c960fd49c3e8..4f49865c9958 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -743,13 +743,12 @@ static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
 /**
  * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page
  * @page: the page
- * @pgdat: pgdat of the page
  *
  * This function relies on page->mem_cgroup being stable.
  */
-static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
-						struct pglist_data *pgdat)
+static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page)
 {
+	pg_data_t *pgdat = page_pgdat(page);
 	struct mem_cgroup *memcg = page_memcg(page);
 
 	VM_WARN_ON_ONCE_PAGE(!memcg && !mem_cgroup_disabled(), page);
@@ -1223,9 +1222,10 @@ static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
 	return &pgdat->__lruvec;
 }
 
-static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
-						    struct pglist_data *pgdat)
+static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page)
 {
+	pg_data_t *pgdat = page_pgdat(page);
+
 	return &pgdat->__lruvec;
 }
 
diff --git a/mm/compaction.c b/mm/compaction.c
index caa4c36c1db3..e7da342003dd 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1033,7 +1033,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		if (!TestClearPageLRU(page))
 			goto isolate_fail_put;
 
-		lruvec = mem_cgroup_page_lruvec(page, pgdat);
+		lruvec = mem_cgroup_page_lruvec(page);
 
 		/* If we already hold the lock, we can skip some rechecking */
 		if (lruvec != locked) {
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9cbfff59b171..1f807448233e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1177,9 +1177,8 @@ void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
 struct lruvec *lock_page_lruvec(struct page *page)
 {
 	struct lruvec *lruvec;
-	struct pglist_data *pgdat = page_pgdat(page);
 
-	lruvec = mem_cgroup_page_lruvec(page, pgdat);
+	lruvec = mem_cgroup_page_lruvec(page);
 	spin_lock(&lruvec->lru_lock);
 
 	lruvec_memcg_debug(lruvec, page);
@@ -1190,9 +1189,8 @@ struct lruvec *lock_page_lruvec(struct page *page)
 struct lruvec *lock_page_lruvec_irq(struct page *page)
 {
 	struct lruvec *lruvec;
-	struct pglist_data *pgdat = page_pgdat(page);
 
-	lruvec = mem_cgroup_page_lruvec(page, pgdat);
+	lruvec = mem_cgroup_page_lruvec(page);
 	spin_lock_irq(&lruvec->lru_lock);
 
 	lruvec_memcg_debug(lruvec, page);
@@ -1203,9 +1201,8 @@ struct lruvec *lock_page_lruvec_irq(struct page *page)
 struct lruvec *lock_page_lruvec_irqsave(struct page *page, unsigned long *flags)
 {
 	struct lruvec *lruvec;
-	struct pglist_data *pgdat = page_pgdat(page);
 
-	lruvec = mem_cgroup_page_lruvec(page, pgdat);
+	lruvec = mem_cgroup_page_lruvec(page);
 	spin_lock_irqsave(&lruvec->lru_lock, *flags);
 
 	lruvec_memcg_debug(lruvec, page);
diff --git a/mm/swap.c b/mm/swap.c
index a75a8265302b..e0d5699213cc 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -313,7 +313,7 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
 
 void lru_note_cost_page(struct page *page)
 {
-	lru_note_cost(mem_cgroup_page_lruvec(page, page_pgdat(page)),
+	lru_note_cost(mem_cgroup_page_lruvec(page),
 		      page_is_file_lru(page), thp_nr_pages(page));
 }
 
diff --git a/mm/workingset.c b/mm/workingset.c
index b7cdeca5a76d..4f7a306ce75a 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -408,7 +408,7 @@ void workingset_activation(struct page *page)
 	memcg = page_memcg_rcu(page);
 	if (!mem_cgroup_disabled() && !memcg)
 		goto out;
-	lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
+	lruvec = mem_cgroup_page_lruvec(page);
 	workingset_age_nonresident(lruvec, thp_nr_pages(page));
 out:
 	rcu_read_unlock();
-- 
2.11.0