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Tue, 17 Jun 2025 14:27:28 +0000 (UTC) From: Luiz Capitulino To: david@redhat.com, willy@infradead.org Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lcapitulino@gmail.com, shivankg@amd.com Subject: [RFC 0/3] mm: introduce snapshot_page() Date: Tue, 17 Jun 2025 10:27:07 -0400 Message-ID: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Rspam-User: X-Rspamd-Queue-Id: EED01C0007 X-Rspamd-Server: rspam10 X-Stat-Signature: jw1xke7f4iuoxqwaraz331i5jwfn7j17 X-HE-Tag: 1750170454-403601 X-HE-Meta: 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 hwZTOrCd DhJgEgulX/nDoH3rYbjVdTnYU90CgkKR5Zs+7lca7dF/RYgZg6n9gzKP8rD9k4OiFEVmqVXcC7hjQU4UCI5RyC0KN5iPzrmgMWKmfknuHgb/Btm0Qs4ftvnsA9G1cQzJsoUyrVIgxqdkSiXqjLSoxqvyPKhGJ3mQmo23datgtQvmZSPqxkV9fjFJMxfRNIUpyuA543r1yCG293cm/U7iQcsAIVDAhR3wR3ynT++pXxFxS2jzSjj51ZJelzWHRrPmmlR+RkSn1ge8sTEa5NnVx+eSoG8CzVS9cVuzt/jfEZVcWAltCqSVDEBTbVSgFEJ4pVvZSJtN/QqouKbESNtkFFhu6kf4JqDT68JJf 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: Hi, This series introduces snapshot_page(), a helper function that can be used to create a snapshot of a struct page and its associated struct folio. This function is intended to help callers with a consistent view of a a folio while reducing the chance of encountering partially updated or inconsistent state, such as during folio splitting which could lead to crashes and BUG_ON()s being triggered. This series is on top of latest Linus tree (9afe652958c3). Luiz Capitulino (3): mm: introduce snapshot_page() proc: kpagecount: use snapshot_page() fs: stable_page_flags(): use snapshot_page() fs/proc/page.c | 46 ++++++++++++++++++++---------- include/linux/mm.h | 20 +++++++++++++ mm/debug.c | 42 +++------------------------ mm/util.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 126 insertions(+), 53 deletions(-) -- 2.49.0