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b=UqhzYvMQwShy+yX4ebcbqbL3BTg7VeWu+fXcy9+1csqA9F/dXEuQrIdJpJZu+7/L0 5TgSSRj+V3KcV7JHs2tslveU3OM/HEYLlNmh+4YUzsoBAh4S6ubp5FHWLY5EUcu9EQ OkVIHTdTid6voTnxnBvJKAlGOAF3Ripzjnz7eDX//RBm/16v4Hna2W4f4iFMguIVUB +9hIYILu+nbENLitc+lrZibMpnr/KTamNWDgb9h8+w/LtfkCWWYWjCazcILWVhZQlq BXBIEmeXIrmRql3AlTl5ui/O85GYlhV2RXy+Jqajab5bro4mwmJz5963mPzfM8Nggo OZZrrPC3nNl1w== From: Will Deacon To: Catalin Marinas , Ard Biesheuvel , Ryan Roberts , Mark Rutland , Andrew Morton , Piotr Jaroszynski Cc: kernel-team@android.com, Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, John Hubbard , Zi Yan , Breno Leitao , stable@vger.kernel.org, Alistair Popple , James Houghton , Jason Gunthorpe Subject: Re: [PATCH v2] arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults Date: Fri, 6 Mar 2026 12:26:52 +0000 Message-ID: <177279636044.453548.11482786576662988237.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260305-contpte-fault-loop-v2-1-0216f0026d7f@nvidia.com> References: <20260305-contpte-fault-loop-v2-1-0216f0026d7f@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 429AD40003 X-Stat-Signature: hkexbaxgixxbnb8d9ycq9wbfqiug74nm X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1772800023-204238 X-HE-Meta: U2FsdGVkX1/QLizOTLQpW6h/XysEX1vpX0oXPAOGn2UG0qfPRbHZthZk28tOVNwuG/cN1cvQLO0Upp7G5QFtrl9WEs9QtLywVtqMRxdpQNwJAvmnAOKkXj2NWRSgYrsXOZO0Z4NHEz2yf9kzekMRujnwen2qYbcoPkFWekpU2F5CZuzofXLipNvGXh3EgLF1U/YqT+BilkB39xNA5LsBuQucwxjMaJXt/vtKGdk/UUBfZgDDM9TPaSrIJesG85P7GsNODp8sc+81u8vdq0eJEqK26Pilt1nXY2KfzXKk5ooDuXdA7rRr9LwVFikH0anrTLBOlUSCdc+DcO1YKwP/5tCBNFRx8r30x/YpcuXT+WymJgpmBDvnQQ+wpiOBaBL6t/jdo6E6wnuSPJbNqf5fn29z9ypkF39fPfjrFfS4mLasT2kTG0p1iAahSvQUXce4uEabHYUEueHYdDp+6Wws2BkHAt40EH3djYc3WSqA1++ERcSGbLfajtxb6j9oQuOCzEoaL+Q04WCmxUGOycBbvjKzQt6I7q4WvNN7wZkwOjGPg2/HoWwPehw3+JyqIfpZViLZTUF+H8YIGlLNnt0ped/GULqWIoJ0iiWW6wFMDmdcU98B2Gc6FRF+LVi4X2ePhs/AZCgtqDeZi/SOc5kjvkQOmfC18vMBMolMuBLlkPw/2TNpjMnN1VTcQMMtO3g0FhPUe6Xl1MdGCIEYSwR9hO6yp8OOD7sAzoUVb/4YIqt3AGJoPSFPcXKDvVmsNfdRiKj2u0WQauodcV9w2fx/8yufFLWjGs/C5sXihYQXYJ2oIQGMVRoeU38ayuw3cPdDVDt0SKcy+26ykkaWHPrK0PsKHgRx+5D/cwOnnv71/1RQ/quMdwwdWJ7WPwkMMGIt6+suJNHfFGykgAoJqCgH5WQUei7GKO+WlJ8W3LifEct3m5RdaHMWkLcKp2jOm9xdKiuTzzuysXgJft/5BJB pMiMK9w0 PqJQdA8Zl8ZoWabmiCo9Hdiuz/BR6izwLEXgsFzEvVqbQ49K7ce+YxL+zRPWWb2KjiJNIZboZEWs3mym68trCPZZAnEdKA5cIVbXTCgrpD/QMS27a9ZJvPAOSSd5XuCxw45EEQLRCpnZURdLMNNpGgAuqcuyOP/P8FmEEbom6ONJUXbsGEEG4Vyk+WcMly2PBr91tRAyPu6a6c2mAmmxo957KV7EWt2motpDzJqhVT23I20sNclmgOuqPQWXChrzz13NqH3kpQujvfK3OLqSUAGThoQVrL4OFZc9HbbPa++Etp4po4H/ma+mwkWNkjQLoyojTIO4ab5ivuaI1w9T5CZEM1XUBPHYOsjB4dChCr2uQ0fRoP9cfej9uBQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 05 Mar 2026 15:26:29 -0800, Piotr Jaroszynski wrote: > contpte_ptep_set_access_flags() compared the gathered ptep_get() value > against the requested entry to detect no-ops. ptep_get() ORs AF/dirty > from all sub-PTEs in the CONT block, so a dirty sibling can make the > target appear already-dirty. When the gathered value matches entry, the > function returns 0 even though the target sub-PTE still has PTE_RDONLY > set in hardware. > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults https://git.kernel.org/arm64/c/97c5550b7631 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev