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Mon, 17 Aug 2026 20:42:59 -0700 (PDT) From: Daehyeon Ko <4ncienth@gmail.com> To: Andrew Morton Cc: Mike Rapoport , linux-mm@kvack.org, David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/secretmem: prevent uncharged mremap expansion after fork Date: Tue, 18 Aug 2026 12:42:12 +0900 Message-ID: <20260818034212.1761451-1-4ncienth@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260817154356.552ccde5d279f6e0a9ef0ff2@linux-foundation.org> References: <20260813225328.2010303-1-4ncienth@gmail.com> <20260817154356.552ccde5d279f6e0a9ef0ff2@linux-foundation.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 646BD40005 X-Rspam-User: X-Stat-Signature: rsswfdi8doxxf5ntqgn7tgg3xapwmxcz X-Rspamd-Server: rspam06 X-HE-Tag: 1787024581-812739 X-HE-Meta: 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 dOnnEa0y VjXy7eUQMarVV+gOTctALfxDijsISrXhjojcQpOAr5ViqhBo6Wx3K0Gl4LG0mbJQeHpiqJPmJZBCYoyZ7ixMzHhZKBCcSjpGOa/6fFAOaPIWatr+IhZQM3tquoP0+HV0G6qkS32Gy4ydpDD7phzlHaVCxeMSVkLpYbRHCRRDKD1tR7CniZdPB4QIvLbRMAxWKmUgeYwVvui3c4XZiXrLfD/voMggXH1+vK78CreH7FpCSLfw4Xmc7lw2Ek3wrMG9scoX8E93qM/lzQ8kzo2I496ZgI5Mk4LBHR9Z8T26vCH5LQm9zO6yUpweh2aVF4UZY20iJN5LLOnfkPrwNnzgxFn6nADZtryiKWBOn0xxFtEm9VM/T1Dd4xx5D1rv6sDRLYS5e Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Thanks for the review. Yes, this patch was developed with AI assistance. I should have included the required Assisted-by trailer, and I apologize for the omission. The related issue is pertinent. Lorenzo's follow-up shows that the underlying problem is broader than the fork/mremap path: secretmem accounting follows the VMA lifetime, while the folios remain unevictable until inode eviction. My VM_DONTEXPAND approach only blocks one path and is not an appropriate fix. Please drop this patch. I will test Lorenzo's follow-up patch and report the results on that thread. Thanks, Daehyeon