[folded-merged] memcg-v1-no-need-for-memcg-locking-for-mglru-fix.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: memcg-v1-no-need-for-memcg-locking-for-mglru-fix
has been removed from the -mm tree.  Its filename was
     memcg-v1-no-need-for-memcg-locking-for-mglru-fix.patch

This patch was dropped because it was folded into memcg-v1-no-need-for-memcg-locking-for-mglru.patch

------------------------------------------------------
From: Yu Zhao <yuzhao@google.com>
Subject: memcg-v1-no-need-for-memcg-locking-for-mglru-fix
Date: Mon, 4 Nov 2024 10:30:29 -0700

remove !rcu_read_lock_held() assertion

  WARNING: CPU: 0 PID: 85 at mm/vmscan.c:3140 folio_update_gen+0x23d/0x250 mm/vmscan.c:3140
  ...

This assertion is incorrect after this patch series that has removed the
charge migration and has removed mem_cgroup_trylock_pages() /
mem_cgroup_unlock_pages() from the caller of this function
(folio_update_gen()).

The assertion was caused by the patch in this thread.  It used to assert
that a folio must be protected from charge migration.  Charge migration is
removed by this series, and as part of the effort, this patch removes the
RCU lock.

Link: https://lkml.kernel.org/r/ZykEtcHrQRq-KrBC@google.com
Link: https://syzkaller.appspot.com/bug?extid=24f45b8beab9788e467e
Link: https://lore.kernel.org/lkml/67294349.050a0220.701a.0010.GAE@google.com/
Signed-off-by: Yu Zhao <yuzhao@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
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>
---

 mm/vmscan.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/vmscan.c~memcg-v1-no-need-for-memcg-locking-for-mglru-fix
+++ a/mm/vmscan.c
@@ -3137,7 +3137,6 @@ static int folio_update_gen(struct folio
 	unsigned long new_flags, old_flags = READ_ONCE(folio->flags);
 
 	VM_WARN_ON_ONCE(gen >= MAX_NR_GENS);
-	VM_WARN_ON_ONCE(!rcu_read_lock_held());
 
 	do {
 		/* lru_gen_del_folio() has isolated this page? */
_

Patches currently in -mm which might be from yuzhao@google.com are

mm-page_alloc-keep-track-of-free-highatomic.patch
memcg-v1-no-need-for-memcg-locking-for-mglru.patch