[PATCH v2 5/5] mm: Remove references to folio in __memcg_kmem_uncharge_page()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

This use of folios is misleading because these pages are not part of
a folio.  Remove an unnecessary call to page_folio(), saving 58 bytes
of text in a Debian kernel build.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
---
 mm/memcontrol.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9e9027dda78c..76ba1953173a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2746,16 +2746,14 @@ int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order)
  */
 void __memcg_kmem_uncharge_page(struct page *page, int order)
 {
-	struct folio *folio = page_folio(page);
-	struct obj_cgroup *objcg;
+	struct obj_cgroup *objcg = page_objcg(page);
 	unsigned int nr_pages = 1 << order;
 
-	if (!folio_memcg_kmem(folio))
+	if (!objcg)
 		return;
 
-	objcg = __folio_objcg(folio);
 	obj_cgroup_uncharge_pages(objcg, nr_pages);
-	folio->memcg_data = 0;
+	page->memcg_data = 0;
 	obj_cgroup_put(objcg);
 }
 
-- 
2.47.2