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Hugh Dickins 0db0d69bc9 mm/gup: local lru_add_drain() to avoid lru_add_drain_all() 
[ Upstream commit a09a8a1fbb374e0053b97306da9dbc05bd384685 ]

In many cases, if collect_longterm_unpinnable_folios() does need to drain
the LRU cache to release a reference, the cache in question is on this
same CPU, and much more efficiently drained by a preliminary local
lru_add_drain(), than the later cross-CPU lru_add_drain_all().

Marked for stable, to counter the increase in lru_add_drain_all()s from
"mm/gup: check ref_count instead of lru before migration".  Note for clean
backports: can take 6.16 commit a03db236ae ("gup: optimize longterm
pin_user_pages() for large folio") first.

Link: https://lkml.kernel.org/r/66f2751f-283e-816d-9530-765db7edc465@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Keir Fraser <keirf@google.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Li Zhe <lizhe.67@bytedance.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shivank Garg <shivankg@amd.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Xu <weixugc@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: yangge <yangge1116@126.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Clean cherry-pick now into this tree ]
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-10-02 13:44:11 +02:00
arch ARM: dts: kirkwood: Fix sound DAI cells for OpenRD clients 2025-10-02 13:44:08 +02:00
block block: add a queue_limits_commit_update_frozen helper 2025-09-09 18:58:24 +02:00
certs
crypto crypto: af_alg - Set merge to zero early in af_alg_sendmsg 2025-09-25 11:13:49 +02:00
Documentation mptcp: pm: nl: announce deny-join-id0 flag 2025-09-25 11:13:50 +02:00
drivers octeontx2-pf: Fix potential use after free in otx2_tc_add_flow() 2025-10-02 13:44:11 +02:00
fs btrfs: don't allow adding block device of less than 1 MB 2025-10-02 13:44:08 +02:00
include Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync 2025-10-02 13:44:10 +02:00
init
io_uring io_uring: fix incorrect io_kiocb reference in io_link_skb 2025-09-25 11:13:49 +02:00
ipc
kernel vhost: Take a reference on the task in struct vhost_task. 2025-10-02 13:44:10 +02:00
lib
LICENSES
mm mm/gup: local lru_add_drain() to avoid lru_add_drain_all() 2025-10-02 13:44:11 +02:00
net nexthop: Forbid FDB status change while nexthop is in a group 2025-10-02 13:44:10 +02:00
rust
samples ftrace/samples: Fix function size computation 2025-09-19 16:35:44 +02:00
scripts
security
sound ALSA: usb-audio: Add mute TLV for playback volumes on more devices 2025-10-02 13:44:07 +02:00
tools selftests: fib_nexthops: Fix creation of non-FDB nexthops 2025-10-02 13:44:10 +02:00
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Makefile Linux 6.12.49 2025-09-25 11:13:51 +02:00
README

README

Linux kernel

There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.

In order to build the documentation, use make htmldocs or make pdfdocs. The formatted documentation can also be read online at:

https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory, several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.