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Mon, 14 Jul 2025 09:17:10 -0400 X-MC-Unique: oYRiNPINObSvP-Ipg2WQ7A-1 X-Mimecast-MFC-AGG-ID: oYRiNPINObSvP-Ipg2WQ7A_1752499029 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 6920219560A2; Mon, 14 Jul 2025 13:17:08 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.22.80.96]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 59E2D1803AF2; Mon, 14 Jul 2025 13:17:06 +0000 (UTC) From: Luiz Capitulino To: david@redhat.com, willy@infradead.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, shivankg@amd.com, sj@kernel.org, harry.yoo@oracle.com Subject: [PATCH v3 0/4] mm: introduce snapshot_page() Date: Mon, 14 Jul 2025 09:16:50 -0400 Message-ID: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Rspamd-Queue-Id: 2B40B180002 X-Stat-Signature: kn7er1sun4y755sdppy3ypqhb5c6zww3 X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1752499033-856417 X-HE-Meta: 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 E+jB6E37 7/YHf55bWxVcY6dc5EctN8gFDVkrircBzlPnEl95dlkVmmdDyI2wEDrSA8otJbVj0iBeJ8/lKZmts4KDk1OVs+XOe3qN7tEp0TJaHHW8EvoHZf7rRF0cM6KOfwzWrTOniUc0S1ePnjkntPJ3PK/sJsidFRAgBhs2JCkluctAzNobqlXpzXuCR3XsLfxw5d9dUpp1D7jKBS4vDeNs1+Br02Z+0P9T4WeLVpFruaLe8DxZMMjHoM0ebI7gqPpz8lTT30Xne4e+RgWIW8jeA9ztmTOYSsUOf5ht/F/DVeCJa5RgoE10JaGvONCSVE+wOfnVt+7HruoqtcMfViYjT7ZykeXviDbanw5BiEuuy 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, The series introduction will follow the changelog. This is against bc9ff192a6c9 . Changelog ========= v2 -> v3 - Small snapshot_page() refactor to simplify and fix stack-out-of-bugs bug reported by Harry Yoo - Use clear_compound_head() in snapshot_page() (Shivank) - Read head pointer from ps->page_snapshot() for tail page case (Shivank) - Improve comments and macro name in snapshot_page() (David) v1 -> v2 - Include is_huge_zero_pfn() patch and use it (David) - Move free page detection to snapshot_page() (David) - Changelog improvements (Shivank) - Added Acked-bys RFC -> v1 - Include to avoid build error on sh arch Introduction ============ 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. David Hildenbrand (1): mm/memory: introduce is_huge_zero_pfn() and use it in vm_normal_page_pmd() Luiz Capitulino (3): mm/util: introduce snapshot_page() proc: kpagecount: use snapshot_page() fs: stable_page_flags(): use snapshot_page() fs/proc/page.c | 50 +++++++++++++++----------- include/linux/huge_mm.h | 12 ++++++- include/linux/mm.h | 19 ++++++++++ mm/debug.c | 42 +++------------------- mm/memory.c | 2 +- mm/util.c | 79 +++++++++++++++++++++++++++++++++++++++++ 6 files changed, 144 insertions(+), 60 deletions(-) -- 2.50.0