memcg-v1-no-need-for-memcg-locking-for-mglru-fix

remove now-unused local:

mm/vmscan.c: In function 'walk_mm':
mm/vmscan.c:3652:28: error: unused variable 'memcg' [-Werror=unused-variable]
 3652 |         struct mem_cgroup *memcg = lruvec_memcg(lruvec);
      |                            ^~~~~
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a1b64ef1d8b1aa7ad469572f4ac8f103db09c86d..8862fcfb6000ab83216bfe6ea0c396b34bf7861e 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3649,10 +3649,8 @@ static void walk_mm(struct mm_struct *mm, struct lru_gen_mm_walk *walk)
                .p4d_entry = walk_pud_range,
                .walk_lock = PGWALK_RDLOCK,
        };
-
        int err;
        struct lruvec *lruvec = walk->lruvec;
-       struct mem_cgroup *memcg = lruvec_memcg(lruvec);
 
        walk->next_addr = FIRST_USER_ADDRESS;