[PATCH 4/5] mm: Simplify folio_memcg_charged()

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

There's no need to check which kind of pointer is in the memcg_data
field, all we actually care about is whether it's zero or not.
Saves 70 bytes in workingset_activation() with the Debian config.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/memcontrol.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 381c5b565dca..28c251e34cdf 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -438,9 +438,7 @@ static inline struct mem_cgroup *folio_memcg(struct folio *folio)
  */
 static inline bool folio_memcg_charged(struct folio *folio)
 {
-	if (folio_memcg_kmem(folio))
-		return __folio_objcg(folio) != NULL;
-	return __folio_memcg(folio) != NULL;
+	return folio->memcg_data != 0;
 }
 
 /*
-- 
2.47.2