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b=aMjXyau/DEsG4YEydgc7sLdZKV3j2+LW2b3eNS7X04Qc4ps76HV4VLUeqoLpSYofQ pNs1KkeKtqL5YsMBwS4HuHwBQgtJTMXc8b0J/LV7PC4ZEmv05CevPNCGlefvGzZzOq SBctlXL5N+6DWUb3QCKOqKJvp/XPk5b9g8EabmrImmA2AFBAHIQRb9BHaxfEWT6YJ5 Wy6SLfoIBnL2o30c+yyJiRVa2EZUQQPBFqVRbNK+Moy1vtqGht1vqXxe9x0SsIb3cw P+sIyiqcq0KQMpzIa7NPFpdKkz01A9vPZ3PEqp0zq+95N0LLvoKeE67Dw1xNIoyakq UBliE1LHD86vA== Message-ID: <2467500f-d72f-4b09-a049-e70fa3fcfb3b@kernel.org> Date: Tue, 27 Oct 2026 00:30:40 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 07/16] mm/shmem: avoid moving the truncation start backwards To: Zi Yan Cc: Andrew Morton , Zhang Yi , Gregory Price , Joshua Hahn , Rakie Kim , Ying Huang , Johannes Weiner , Vladimir Davydov , Michal Hocko , Hugh Dickins , Baolin Wang , Lukas Czerner , Carlos Maiolino , Christian Brauner , Jan Kara , Daniel Verkamp , Jeff Xu , Muchun Song , Oscar Salvador , David Stevens , "Matthew Wilcox (Oracle)" , William Kucharski , Chris Li , Kairui Song , Nhat Pham , Miaohe Lin , Naoya Horiguchi , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Chris Mason , stable@vger.kernel.org References: <20261026-fixes_shmem-v1-0-703206d5fa0c@kernel.org> <20261026-fixes_shmem-v1-7-703206d5fa0c@kernel.org> <2E377C76-D62C-4A2A-94E3-ABC40C6FCDD2@nvidia.com> <583728ed-dc63-4685-9ac5-5a980db55973@kernel.org> <0D22B04E-5730-4D3A-ADA6-9F1AF94F06AA@nvidia.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 17F5C40008 X-Spam-Status: No, score=-7.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Stat-Signature: ksnwisgcnqfa8m1k746dwbq9cbs4i76u X-HE-Tag: 1793057454-942733 X-HE-Meta: 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 Dy9ORu/q RwErWOvGxoFPXCfMq96KaYCUN5BageUDy3qeDgWzBSxN8VafFrEccy8XfcRHYKq3ED5Bm9caNNxuk/7QBwVsYajuW+/1Ny0e0GUydZpQqFNzLycJWrucfQQsln1vYBQHLeBgnV4YpfQ53RAe6rwuUUdqKrXmXNkDHf54wuleeP3LgO2LhXin8A9i3hJomo6jt9q8i/j8rozhvhtq70UEpZASiGubhzp122PkasIVF8wQxYZi+bK5xcwGzbaxD9WI8fQ+fXpcAJ9ayxIiUGVChMyprV7b+iXLH+wP5eVqJmk2bgZSFjw/vwBfEzKS9pn1SO2Ed+AbXoFmvcV60YEYCyjgltWYYpx+Ze+l3/ukjYnafhM4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/27/26 00:28, Zi Yan wrote: > On 26 Oct 2026, at 19:24, David Hildenbrand (Arm) wrote: > >> On 10/27/26 00:16, Zi Yan wrote: >>> >>> >>> To clarify the dependency, without Zhang Yi’s >>> truncate_inode_partial_folio() patchset, the ext4 + iomap changes >>> would cause data loss. We probably want to get Zhang Yi’s patches >>> in first to avoid that. >> >> Ugh, what a mess. >> >>> >>> Patch 7 to 11 do not apply cleanly on top of mm-stable due to Zhang Yi’s >>> truncate fix, where >>> >>> 1. patch 7 can be dropped as I discussed above, >>> 2. patch 8 needs a folio->mapping guard for the added statement, >>> 3. patch 9-11 can be applied with fuzzy, but I need to look into >>> them about functionalities before fully trust what LLM says. >> Yeah, let me take a look tomorrow. > > I will reply to these patches individually in terms of rebasing on > top of mm-stable and how they interact with Zhang Yi’s changes. > It is not too bad at first look. > >> >> I cannot put into words how much this shmem + pagecache shite annoys me. >> >> What a piece of crap people created here. And looking at the massive changes to >> fix stuff, what a piece of crap people are creating. >> >> I better go to sleep now :) > > Good night. :) Thanks! :) -- Cheers, David