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From: Shakeel Butt To: Qi Zheng Cc: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, muchun.song@linux.dev, david@kernel.org, lorenzo.stoakes@oracle.com, ziy@nvidia.com, harry.yoo@oracle.com, imran.f.khan@oracle.com, kamalesh.babulal@oracle.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, chenridong@huaweicloud.com, mkoutny@suse.com, akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com, apais@linux.microsoft.com, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Muchun Song , Nhat Pham , Chengming Zhou , Qi Zheng Subject: Re: [PATCH v2 20/28] mm: zswap: prevent lruvec release in zswap_folio_swapin() Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 9DC27A0009 X-Stat-Signature: dmtjebhacm5d38scb71mxbmtj5h5rh8g X-HE-Tag: 1766193796-412036 X-HE-Meta: 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 jExNpvED yNfCqylVG8YbPBwjSBDH5l/M2tMZ8EUf4UDkXSoLQ63xAxWEaUTD3TFdDQsKvNcOyvHXFlMSI4ExnfXxNcQFCvmSOioyobm0NuV/j/bZCbh59RVOXLYIuKnwoi9oKayXE4f82JO281C2suMPe6Hdsgzb9QJscEVRL5xQD3MELkvd1n9wDxqsdnrXCJhboXireLhOoaGb0Oyz3UO7jesaYxzINiJwqWcRBmG564dWmzMuMZwOP6uoK+LBbIhQHmvucAR4DnWuBNVMTmop/3GoG5+BkzlymrMjOqSGPUM/JmwzVcFXYMZTSxwjL6n04Q1984tFKyE0jMbd95WY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Dec 17, 2025 at 03:27:44PM +0800, Qi Zheng wrote: > From: Muchun Song > > In the near future, a folio will no longer pin its corresponding > memory cgroup. So an lruvec returned by folio_lruvec() could be > released without the rcu read lock or a reference to its memory > cgroup. > > In the current patch, the rcu read lock is employed to safeguard > against the release of the lruvec in zswap_folio_swapin(). > > This serves as a preparatory measure for the reparenting of the > LRU pages. > > Signed-off-by: Muchun Song > Acked-by: Nhat Pham > Reviewed-by: Chengming Zhou > Signed-off-by: Qi Zheng > Reviewed-by: Harry Yoo Acked-by: Shakeel Butt