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@xxxxxxxxxx> 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@xxxxxxxxxx Link: https://syzkaller.appspot.com/bug?extid=24f45b8beab9788e467e Link: https://lore.kernel.org/lkml/67294349.050a0220.701a.0010.GAE@xxxxxxxxxx/ Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Muchun Song <muchun.song@xxxxxxxxx> Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx> Cc: Shakeel Butt <shakeel.butt@xxxxxxxxx> Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxxxxx are mm-page_alloc-keep-track-of-free-highatomic.patch memcg-v1-no-need-for-memcg-locking-for-mglru.patch