From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B5160337699 for ; Sat, 18 Apr 2026 07:49:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776498576; cv=none; b=ULjg1NxKOA6xRI/K7D5FFFfVAfEIP8Zo5Uy7jHE1x7ibo37Jok0x5osYvu0MP60gx5NdjVkeegetompYGBBN8M/1GarkN9sH2Q6rC+RYlwT0YJnbtlVIQFjbEC60TWMmuwGgcpWGQVzBgyKMYhpbfm6DvCEQ2GVHuM5aS3Bds7M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776498576; c=relaxed/simple; bh=6bew7yLijDvSltF2CPeCKTQ4RAkY5FhpmkVeiCgxX40=; h=Date:To:From:Subject:Message-Id; b=eSGRqWDbPeFStToEN9TQ03zQbrx7/5vblHtE22h6L2Ck/D16k69upWF8s/zCcN1T4ABSe04VTtxMnJMyEgtUHkT9FhjUJrWtq+wSznS6dbaN7OEgitPZhPs+/FN+YnspXfXDlkcZSz5Rn+tr9A6dehoEvUSQTCU0TsI5Og7qL3I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=o2aBsnY7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="o2aBsnY7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A830DC19424; Sat, 18 Apr 2026 07:49:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1776498576; bh=6bew7yLijDvSltF2CPeCKTQ4RAkY5FhpmkVeiCgxX40=; h=Date:To:From:Subject:From; b=o2aBsnY7Ex/mnXGgL9SExET9bIDD8o71mQQoLPXUoHHKBsOq6NxzdDXJhnARY7aRh dGxLBn+EZgHTj0FY3h77oQ3OujmzIGkDRGawVpmfKXLE5d7FU+tPz10kZYjsW6bNju QSumwUgExbsJnZqulvfB6OSJ9jvTNWwFZx8wtVIc= Date: Sat, 18 Apr 2026 00:49:31 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,zhengqi.arch@bytedance.com,yuanchu@google.com,yosry@kernel.org,weixugc@google.com,vbabka@kernel.org,usamaarif642@gmail.com,surenb@google.com,shakeel.butt@linux.dev,rppt@kernel.org,roman.gushchin@linux.dev,nphamcs@gmail.com,muchun.song@linux.dev,mkoutny@suse.com,mhocko@suse.com,ljs@kernel.org,Liam.Howlett@oracle.com,lance.yang@linux.dev,kamalesh.babulal@oracle.com,imran.f.khan@oracle.com,hughd@google.com,harry.yoo@oracle.com,hannes@cmpxchg.org,hamzamahfooz@linux.microsoft.com,david@kernel.org,chenridong@huawei.com,chengming.zhou@linux.dev,bhe@redhat.com,axelrasmussen@google.com,apais@linux.microsoft.com,songmuchun@bytedance.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-zswap-prevent-lruvec-release-in-zswap_folio_swapin.patch removed from -mm tree Message-Id: <20260418074935.A830DC19424@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm: zswap: prevent lruvec release in zswap_folio_swapin() has been removed from the -mm tree. Its filename was mm-zswap-prevent-lruvec-release-in-zswap_folio_swapin.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Muchun Song Subject: mm: zswap: prevent lruvec release in zswap_folio_swapin() Date: Thu, 5 Mar 2026 19:52:38 +0800 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. Link: https://lore.kernel.org/02b3f76ee8d1132f69ac5baaedce38fb82b09a48.1772711148.git.zhengqi.arch@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Qi Zheng Acked-by: Nhat Pham Reviewed-by: Chengming Zhou Reviewed-by: Harry Yoo Acked-by: Johannes Weiner Acked-by: Shakeel Butt Cc: Allen Pais Cc: Axel Rasmussen Cc: Baoquan He Cc: Chen Ridong Cc: David Hildenbrand Cc: Hamza Mahfooz Cc: Hugh Dickins Cc: Imran Khan Cc: Kamalesh Babulal Cc: Lance Yang Cc: Liam Howlett Cc: Lorenzo Stoakes (Oracle) Cc: Michal Hocko Cc: Michal Koutný Cc: Mike Rapoport Cc: Muchun Song Cc: Roman Gushchin Cc: Suren Baghdasaryan Cc: Usama Arif Cc: Vlastimil Babka Cc: Wei Xu Cc: Yosry Ahmed Cc: Yuanchu Xie Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/zswap.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/zswap.c~mm-zswap-prevent-lruvec-release-in-zswap_folio_swapin +++ a/mm/zswap.c @@ -664,8 +664,10 @@ void zswap_folio_swapin(struct folio *fo struct lruvec *lruvec; if (folio) { + rcu_read_lock(); lruvec = folio_lruvec(folio); atomic_long_inc(&lruvec->zswap_lruvec_state.nr_disk_swapins); + rcu_read_unlock(); } } _ Patches currently in -mm which might be from songmuchun@bytedance.com are