[PATCH v2 07/46] mm/workingset: Convert workingset_activation to take a folio

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

This function already assumed it was being passed a head page.  No real
change here, except that thp_nr_pages() compiles away on kernels with
THP compiled out while folio_nr_pages() is always present.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/swap.h |  2 +-
 mm/swap.c            |  2 +-
 mm/workingset.c      | 10 +++++-----
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 76b2338ef24d..8e0118b25bdc 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -324,7 +324,7 @@ static inline swp_entry_t folio_swap_entry(struct folio *folio)
 void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages);
 void *workingset_eviction(struct page *page, struct mem_cgroup *target_memcg);
 void workingset_refault(struct page *page, void *shadow);
-void workingset_activation(struct page *page);
+void workingset_activation(struct folio *folio);
 
 /* Only track the nodes of mappings with shadow entries */
 void workingset_update_node(struct xa_node *node);
diff --git a/mm/swap.c b/mm/swap.c
index b01352821583..00d1d781c1c3 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -447,7 +447,7 @@ void mark_page_accessed(struct page *page)
 		else
 			__lru_cache_activate_page(page);
 		ClearPageReferenced(page);
-		workingset_activation(page);
+		workingset_activation(page_folio(page));
 	}
 	if (page_is_idle(page))
 		clear_page_idle(page);
diff --git a/mm/workingset.c b/mm/workingset.c
index b7cdeca5a76d..37cdcda96afd 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -390,9 +390,9 @@ void workingset_refault(struct page *page, void *shadow)
 
 /**
  * workingset_activation - note a page activation
- * @page: page that is being activated
+ * @folio: Folio that is being activated.
  */
-void workingset_activation(struct page *page)
+void workingset_activation(struct folio *folio)
 {
 	struct mem_cgroup *memcg;
 	struct lruvec *lruvec;
@@ -405,11 +405,11 @@ void workingset_activation(struct page *page)
 	 * XXX: See workingset_refault() - this should return
 	 * root_mem_cgroup even for !CONFIG_MEMCG.
 	 */
-	memcg = page_memcg_rcu(page);
+	memcg = page_memcg_rcu(&folio->page);
 	if (!mem_cgroup_disabled() && !memcg)
 		goto out;
-	lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
-	workingset_age_nonresident(lruvec, thp_nr_pages(page));
+	lruvec = mem_cgroup_folio_lruvec(folio);
+	workingset_age_nonresident(lruvec, folio_nr_pages(folio));
 out:
 	rcu_read_unlock();
 }
-- 
2.30.2