[PATCH 2/3] memcg: Simplify mod_lruvec_kmem_state()

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

Use the new memcg_stat_mod() which does exactly what
mod_lruvec_kmem_state() needs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/memcontrol.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b356ef312bc2..8d9e4a42aecf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -815,24 +815,9 @@ EXPORT_SYMBOL(lruvec_stat_mod_folio);
 void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val)
 {
 	pg_data_t *pgdat = page_pgdat(virt_to_page(p));
-	struct mem_cgroup *memcg;
-	struct lruvec *lruvec;
 
 	rcu_read_lock();
-	memcg = mem_cgroup_from_virt(p);
-
-	/*
-	 * Untracked pages have no memcg, no lruvec. Update only the
-	 * node. If we reparent the slab objects to the root memcg,
-	 * when we free the slab object, we need to update the per-memcg
-	 * vmstats to keep it correct for the root memcg.
-	 */
-	if (!memcg) {
-		mod_node_page_state(pgdat, idx, val);
-	} else {
-		lruvec = mem_cgroup_lruvec(memcg, pgdat);
-		mod_lruvec_state(lruvec, idx, val);
-	}
+	memcg_stat_mod(mem_cgroup_from_virt(p), pgdat, idx, val);
 	rcu_read_unlock();
 }
 
-- 
2.47.3