linux-kernel - [PATCH v2 0/6] mm: better GUP pin lru_add_drain

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <41395944-b0e3-c3ac-d648-8ddd70451d28@google.com>
Date: Mon, 8 Sep 2025 15:12:20 -0700 (PDT)
From: Hugh Dickins <hughd@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: Alexander Krabler <Alexander.Krabler@...a.com>, 
    "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>, 
    Axel Rasmussen <axelrasmussen@...gle.com>, Chris Li <chrisl@...nel.org>, 
    Christoph Hellwig <hch@...radead.org>, 
    David Hildenbrand <david@...hat.com>, Frederick Mayle <fmayle@...gle.com>, 
    Jason Gunthorpe <jgg@...pe.ca>, Johannes Weiner <hannes@...xchg.org>, 
    John Hubbard <jhubbard@...dia.com>, Keir Fraser <keirf@...gle.com>, 
    Konstantin Khlebnikov <koct9i@...il.com>, Li Zhe <lizhe.67@...edance.com>, 
    Matthew Wilcox <willy@...radead.org>, Peter Xu <peterx@...hat.com>, 
    Rik van Riel <riel@...riel.com>, Shivank Garg <shivankg@....com>, 
    Vlastimil Babka <vbabka@...e.cz>, Wei Xu <weixugc@...gle.com>, 
    Will Deacon <will@...nel.org>, yangge <yangge1116@....com>, 
    Yuanchu Xie <yuanchu@...gle.com>, Yu Zhao <yuzhao@...gle.com>, 
    linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2 0/6] mm: better GUP pin lru_add_drain_all()

Series of lru_add_drain_all()-related patches, arising from recent
mm/gup migration report from Will Deacon.  Based on 6.17-rc3 but apply
to replace v1 in mm.git.  I suggest all but 6/6 be hotfixes going to
6.17 and stable.

v1 was at
https://lore.kernel.org/linux-mm/a28b44f7-cdb4-8b81-4982-758ae774fbf7@google.com/
amd its
1/7 mm: fix folio_expected_ref_count() when PG_private_2
has been dropped from v2, per Matthew Wilcox.

1/6 mm/gup: check ref_count instead of lru before migration
    v1->v2: paragraph on PG_private_2 added to commit message
2/6 mm/gup: local lru_add_drain() to avoid lru_add_drain_all()
    v1->v2: lru_add_drain() only when needed, per David
3/6 mm: Revert "mm/gup: clear the LRU flag of a page before
    v1->v2: Acked-by David added
4/6 mm: Revert "mm: vmscan.c: fix OOM on swap stress test"
    v1->v2: Acked-by David added
5/6 mm: folio_may_be_lru_cached() unless folio_test_large()
    v1->v2: folio_may_be_lru_cached(): lru_ per David
6/6 mm: lru_add_drain_all() do local lru_add_drain() first
    v1->v2: Acked-by David added

 include/linux/swap.h |   10 ++++++++
 mm/gup.c             |   14 ++++++++---
 mm/mlock.c           |    6 ++--
 mm/swap.c            |   53 +++++++++++++++++++++++--------------------
 mm/vmscan.c          |    2 -
 5 files changed, 54 insertions(+), 31 deletions(-)

Thanks,
Hugh