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Received: from 30.74.144.135(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0XDFhPZN_1792568765 cluster:ay36) by smtp.aliyun-inc.com; Wed, 21 Oct 2026 15:46:06 +0800 Message-ID: <6462de1a-b141-4f20-94a8-973708a71ba2@linux.alibaba.com> Date: Wed, 21 Oct 2026 15:46:05 +0800 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm: memory: fix truncation removing mapped folios To: "David Hildenbrand (Arm)" , akpm@linux-foundation.org Cc: ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, qi.zheng@linux.dev, jack@suse.cz, pfalcato@suse.de, ayushr@modal.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <542c97482eae84f86704bcee56482633d1b32321.1791616645.git.baolin.wang@linux.alibaba.com> <8245424a-f068-4be5-9e58-713cbff1f8ae@kernel.org> <405811f5-ee36-4b3c-80d0-7dc6827ab5d4@linux.alibaba.com> <6660d3bb-3485-4c34-8734-3ea99df920f1@kernel.org> <02c9a968-92e2-49e2-bffc-74d264a5c911@linux.alibaba.com> <938e215b-a2fd-4f1a-b4c5-e46b8af0f00b@kernel.org> From: Baolin Wang In-Reply-To: <938e215b-a2fd-4f1a-b4c5-e46b8af0f00b@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 5EEC9140005 X-Stat-Signature: 6jjy93woz4486x6cndpca4ad8z6s6gop X-Spam-Status: No, score=-14.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_SANE_1,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1792568773-973606 X-HE-Meta: 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 gIfXonkm uuASwIa7aYYVoq27cRNYVi/5nSru8fA84H85o05UsM44heHKRlkMj77CpaExyvOKKTPvYKOgXXHsQwYjdfudowwLkc3LgUfBxkzNemVr1GtI5iCvtSRUPk+kM8hNc/4uw1K3uMy2uUrtPvERkyvno1LVRo4pD472+kE7qxJ53YwLCNWDE7pSF3HQ1KbS+ZwcCYu1Ob8T24JxsJfYFSGjqCqONLUKyk0tYVyfzl4aSoSdY3DstYksbL5iJS0ECKZKL456DnOPylAQFPvpxtgVjs7wNCHbag04bJSrI14W+/BqxgbeJBFfm7cq/l/bMLjy2lPgck4PBDsT0vLvnt3rU/UPYVecQEZAzG59R 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 10/20/26 4:36 PM, David Hildenbrand (Arm) wrote: >>>>                  if (pmd_none(*pmd)) { >>>> +                       if (details && details->single_folio) >>>> +                               sync_with_folio_pmd_zap(tlb->mm, pmd); >>>>                          addr = next; >>>>                          continue; >>>>                  } >>> >>> We do have another sync_with_folio_pmd_zap() user in page_vma_mapped_walk(), >>> does that one need care as well? >> >> Good point. But I don't want to add page_vma_mapped_walk() changes into this fix >> patch. I need to analyze all callers of page_vma_mapped_walk() and the potential >> races. I'll look into whether it should be changed in a follow-up patch. > > Yes, please have a look. I am 99.9% sure that we face the exact same issue there > as well. Sure. Add it to my TODO list. BTW, could you take a look at my reply to your concern about v3 when you feel free? Thanks. https://lore.kernel.org/all/179c26ed-1764-4e5b-a7ee-047ddabbfea1@linux.alibaba.com/