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[2003:d8:2f3f:4b00:ee13:8c22:5cc5:d169]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429c13eae16sm4529835f8f.32.2025.10.31.10.15.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Oct 2025 10:15:45 -0700 (PDT) Message-ID: <7dd84c85-3cb4-48d1-94c2-83e17bf74d34@redhat.com> Date: Fri, 31 Oct 2025 18:15:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/huge_memory: Initialise the tags of the huge zero folio To: Catalin Marinas , linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org, Andrew Morton , Will Deacon References: <20251031170133.280742-1-catalin.marinas@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20251031170133.280742-1-catalin.marinas@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SfJud1muWusFiEUdQF2CPTKjOyaXnVzWJ-Hg38Oo6DQ_1761930946 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 56C8320011 X-Stat-Signature: qdotg7pn4s4cbs8ejm6kdg13fuz3in6r X-Rspam-User: X-HE-Tag: 1761930958-812692 X-HE-Meta: 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 nLr/mOOD 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 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: On 31.10.25 17:57, Catalin Marinas wrote: > On arm64 with MTE enabled, a page mapped as Normal Tagged (PROT_MTE) in > user space will need to have its allocation tags initialised. This is > normally done in the arm64 set_pte_at() after checking the memory > attributes. Such page is also marked with the PG_mte_tagged flag to > avoid subsequent clearing. Since this relies on having a struct page, > pte_special() mappings are ignored. > > Commit d82d09e48219 ("mm/huge_memory: mark PMD mappings of the huge zero > folio special") maps the huge zero folio special and the arm64 > set_pmd_at() will no longer zero the tags. There is no guarantee that > the tags are zero, especially if parts of this huge page have been > previously tagged. > > Allocate the huge zero folio with the __GFP_ZEROTAGS flag. In addition, > do not warn in the arm64 __access_remote_tags() when reading tags from > the huge zero page. > > Fixes: d82d09e48219 ("mm/huge_memory: mark PMD mappings of the huge zero folio special") > Signed-off-by: Catalin Marinas > Cc: David Hildenbrand > Cc: Andrew Morton > Cc: Will Deacon Acked-by: David Hildenbrand Thanks, Catalin! -- Cheers David / dhildenb