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[34.85.221.182]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7882218774esm28462007b3.57.2025.11.15.15.34.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Nov 2025 15:34:52 -0800 (PST) From: Pasha Tatashin To: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.com, pasha.tatashin@soleen.com, rppt@kernel.org, dmatlack@google.com, rientjes@google.com, corbet@lwn.net, rdunlap@infradead.org, ilpo.jarvinen@linux.intel.com, kanie@linux.alibaba.com, ojeda@kernel.org, aliceryhl@google.com, masahiroy@kernel.org, akpm@linux-foundation.org, tj@kernel.org, yoann.congal@smile.fr, mmaurer@google.com, roman.gushchin@linux.dev, chenridong@huawei.com, axboe@kernel.dk, mark.rutland@arm.com, jannh@google.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, dan.j.williams@intel.com, david@redhat.com, joel.granados@kernel.org, rostedt@goodmis.org, anna.schumaker@oracle.com, song@kernel.org, linux@weissschuh.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, gregkh@linuxfoundation.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rafael@kernel.org, dakr@kernel.org, bartosz.golaszewski@linaro.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, yesanishhere@gmail.com, Jonathan.Cameron@huawei.com, quic_zijuhu@quicinc.com, aleksander.lobakin@intel.com, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, leon@kernel.org, lukas@wunner.de, bhelgaas@google.com, wagi@kernel.org, djeffery@redhat.com, stuart.w.hayes@gmail.com, ptyadav@amazon.de, lennart@poettering.net, brauner@kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, saeedm@nvidia.com, ajayachandra@nvidia.com, jgg@nvidia.com, parav@nvidia.com, leonro@nvidia.com, witu@nvidia.com, hughd@google.com, skhawaja@google.com, chrisl@kernel.org Subject: [PATCH v6 16/20] docs: add documentation for memfd preservation via LUO Date: Sat, 15 Nov 2025 18:34:02 -0500 Message-ID: <20251115233409.768044-17-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.52.0.rc1.455.g30608eb744-goog In-Reply-To: <20251115233409.768044-1-pasha.tatashin@soleen.com> References: <20251115233409.768044-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: BB2C04000E X-Stat-Signature: 7x9x6zm4kq7pw7j5oax6gcynpmh11bux X-HE-Tag: 1763249694-417541 X-HE-Meta: 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 cylwwZ89 oW7QtFxuHgDTxLuf7sL+rHvPY46j4Ni23RRGiSsO6anfG+w/0RzhCkKLdNg+QeT9X/+1TQdztOvZz5MhSICGrcJomLXZHbRgg1A9wUUg/rkBYQWSz4rsXAGcSXA== 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: From: Pratyush Yadav Add the documentation under the "Preserving file descriptors" section of LUO's documentation. Signed-off-by: Pratyush Yadav Co-developed-by: Pasha Tatashin Signed-off-by: Pasha Tatashin --- Documentation/core-api/liveupdate.rst | 7 +++++++ Documentation/mm/index.rst | 1 + Documentation/mm/memfd_preservation.rst | 23 +++++++++++++++++++++++ MAINTAINERS | 1 + 4 files changed, 32 insertions(+) create mode 100644 Documentation/mm/memfd_preservation.rst diff --git a/Documentation/core-api/liveupdate.rst b/Documentation/core-api/liveupdate.rst index deacc098d024..384de79a2457 100644 --- a/Documentation/core-api/liveupdate.rst +++ b/Documentation/core-api/liveupdate.rst @@ -28,6 +28,13 @@ Live Update Orchestrator ABI .. kernel-doc:: include/linux/liveupdate/abi/luo.h :doc: Live Update Orchestrator ABI +The following types of file descriptors can be preserved + +.. toctree:: + :maxdepth: 1 + + ../mm/memfd_preservation + Public API ========== .. kernel-doc:: include/linux/liveupdate.h diff --git a/Documentation/mm/index.rst b/Documentation/mm/index.rst index ba6a8872849b..7aa2a8886908 100644 --- a/Documentation/mm/index.rst +++ b/Documentation/mm/index.rst @@ -48,6 +48,7 @@ documentation, or deleted if it has served its purpose. hugetlbfs_reserv ksm memory-model + memfd_preservation mmu_notifier multigen_lru numa diff --git a/Documentation/mm/memfd_preservation.rst b/Documentation/mm/memfd_preservation.rst new file mode 100644 index 000000000000..4f09c3921893 --- /dev/null +++ b/Documentation/mm/memfd_preservation.rst @@ -0,0 +1,23 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +========================== +Memfd Preservation via LUO +========================== + +.. kernel-doc:: mm/memfd_luo.c + :doc: Memfd Preservation via LUO + +Memfd Preservation ABI +====================== + +.. kernel-doc:: include/linux/liveupdate/abi/memfd.h + :doc: DOC: memfd Live Update ABI + +.. kernel-doc:: include/linux/liveupdate/abi/memfd.h + :internal: + +See Also +======== + +- :doc:`/core-api/liveupdate` +- :doc:`/core-api/kho/concepts` diff --git a/MAINTAINERS b/MAINTAINERS index ad9fee6dc605..6ffe4425adbf 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14470,6 +14470,7 @@ R: Pratyush Yadav L: linux-kernel@vger.kernel.org S: Maintained F: Documentation/core-api/liveupdate.rst +F: Documentation/mm/memfd_preservation.rst F: Documentation/userspace-api/liveupdate.rst F: include/linux/liveupdate.h F: include/linux/liveupdate/ -- 2.52.0.rc1.455.g30608eb744-goog