From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Zi Yan <ziy@nvidia.com>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Muchun Song <muchun.song@linux.dev>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <nico.pache@linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Gregory Price <gourry@gourry.net>,
Ying Huang <ying.huang@linux.alibaba.com>,
Alistair Popple <apopple@nvidia.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Qi Zheng <qi.zheng@linux.dev>,
Shakeel Butt <shakeel.butt@linux.dev>,
Kairui Song <kasong@tencent.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Gao Xiang <xiang@kernel.org>, Chao Yu <chao@kernel.org>,
Yue Hu <zbestahu@gmail.com>,
Jeffle Xu <jefflexu@linux.alibaba.com>,
Sandeep Dhavale <dhavale@google.com>,
Hongbo Li <hongbohbli@tencent.com>,
Chunhai Guo <guochunhai@vivo.com>,
linux-erofs@lists.ozlabs.org
Subject: Re: [PATCH v3 08/14] erofs: use folio_attach/detach_private() instead of direct assignment
Date: Tue, 8 Sep 2026 18:13:37 +0200 [thread overview]
Message-ID: <5b02f5de-00b6-4f8e-9e30-6d0acedafaf4@kernel.org> (raw)
In-Reply-To: <20260907-remove-pg_private-v3-8-6ae22f9d9272@nvidia.com>
On 9/8/26 04:56, Zi Yan wrote:
> erofs_onlinefolio_init/split/end() use folio->private without setting
> PG_private or increasing folio refcount and it works. But after PG_private
> is replaced by checking folio->private in a future commit, it can break
> folio_expected_ref_count(), since the folio has private data without
> elevated refcount. Change them to use folio_attach/detach_private().
Freezing the folio will properly work I assume, as we'd always freeze with that
refcount in mind or remove the reference (detach private) early?
I'm thinking of folio_ref_freeze() in __folio_freeze_and_split_unmapped().
Or is the ref only very short-lived either way such that we don't care?
--
Cheers,
David
next prev parent reply other threads:[~2026-09-08 16:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-08 2:56 [PATCH v3 00/14] Remove PG_private by using page/folio->private checks instead Zi Yan
2026-09-08 2:56 ` [PATCH v3 07/14] erofs: mm/pagemap: add readahead_folio_last() to avoid folio->private Zi Yan
2026-09-08 16:04 ` David Hildenbrand (Arm)
2026-09-08 17:05 ` Zi Yan
2026-09-09 14:10 ` David Hildenbrand (Arm)
2026-09-08 2:56 ` [PATCH v3 08/14] erofs: use folio_attach/detach_private() instead of direct assignment Zi Yan
2026-09-08 16:13 ` David Hildenbrand (Arm) [this message]
2026-09-08 17:19 ` Zi Yan
2026-09-09 13:27 ` David Hildenbrand (Arm)
2026-09-10 2:06 ` Zi Yan
2026-09-14 15:30 ` [f2fs-dev] [PATCH v3 00/14] Remove PG_private by using page/folio->private checks instead patchwork-bot+f2fs
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