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b=k+pnsy4fWPkXwfVMksDv+bMO+YyWftFmJ0jKoxspeeKx3X88cZjWmGCV5KY4k1Hf2 s/W/gJv9Am5Sp2k27ywUsBH/kLCQSar6mWpoWJocfSZRO/lPdlvCv8z5fVSi9R7Ww9 cWkmFEGgxC3IN3iT5gbpAxLnuK1wBjdX04WntgzGm2+5V4KK2OBklCc7yZJzxgIrIJ muSGIOXoEeZJNpJLVIelzuqciPM0Gh/9y+F5kDE4wD6NAc1k/K4h0JMnglGjUqA+xq qwxsorPjrCido/ndEjugddMooAR4PLQ0HqDQ1UJgG5GK4FYrKD/rNn6l3dz7Qqznb/ Vl1FDlafmDQzw== Message-ID: Date: Mon, 4 May 2026 14:58:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4] selftests/mm: ksm-functional-tests: fix partial write handling To: Vineet Agarwal , shuah@kernel.org, akpm@linux-foundation.org Cc: linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com References: <20260504081638.683223-1-agarwal.vineet2006@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: <20260504081638.683223-1-agarwal.vineet2006@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 0F8FD4000B X-Stat-Signature: 69cbu5wb6dm6sh37cxjo5oc8bnnb7j3z X-HE-Tag: 1777899539-442403 X-HE-Meta: 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 yL31GVTB nF7rxfJ//SPsaA9P/JIdcpXgF22Se3AthyFYmi3d/kyBLUywrqAs3IbOaOyZTIqXeKwukOtkqbV5BctF5PtJEU3XqXzuBYnHYtBFAfc0IXt3F8AWqxGHqF05Med//aVukgGWLrNKA1jbi2mzvPRXjrOJHtRn5bsWkRPYp0cazOf6oRz8G38xFBCwQ0cW6WYxdwipPXsMBl0Kg6smHjc8MnFxPx6QikFrRg4KcMzSCePpAxGauUU2WJNBsLmn9BTD3/Ts9L8rmCf3o9RGexrqNoMb3gVlM6FkjGBfYCPGybf1nM+jZI7uxMEjkq3aRWEPTnuBWEcwZiKeBN9ttDHnE67BHpKz3qVSUJrQfJTkkVdgncouvCZyp5x943Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/4/26 10:13, Vineet Agarwal wrote: > Update write() checks to properly detect and handle partial writes. > > Previously, the write() calls used <= 0 to detect failure. This > condition is never true for partial writes (ret > 0 but ret < len), > so partial writes were silently treated as success. > > Fix this by verifying that write() returns the full expected length > and treating any mismatch as failure. > > Signed-off-by: Vineet Agarwal > Thanks! Acked-by: David Hildenbrand (Arm) -- Cheers, David