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b=P4/rF3ZSylK+dBUn1xj86IryMJaFVSWYryQkubG/z59q5KlNELky4PZ+r/+crs+3/ x0fiFk8gCSwBCSmUIuer6Nh57SBsgRlLSj2h+W/S9YQnj4i4psF2+6eTxqqFcr2hei RE6Nerb9ueRW98FtkrpIDj2W8P1dnxuG9jYVj2H2KiyW5gJgpIHHmyi/OKVysbk9lT oOvf67FK2U+4t4iJo5U/xrql5kBpn6/Q9fqgJhZxh/fWH2GLiERdc07aBflBERS+MA kDosDukktUDSaWtlsu+Q7XaTOD1rdDyaRDEear7F3Eqg4K6g0kJllG6kvx2lCAi/gL 8PpvF9vRbTNag== Message-ID: Date: Fri, 8 May 2026 14:23:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] selftests/mm: add MADV_COLLAPSE sub-PMD range tests To: Chen Wandun , akpm@linux-foundation.org, ljs@kernel.org, shuah@kernel.org, zokeefe@google.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org References: <20260507070558.3064142-1-chenwandun@lixiang.com> <20260507070558.3064142-3-chenwandun@lixiang.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: <20260507070558.3064142-3-chenwandun@lixiang.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 87A621A0004 X-Stat-Signature: qn85ddggsmk9d8jkg43r3ufugmazw1me X-HE-Tag: 1778243027-721825 X-HE-Meta: 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 t7xPYLZh +cEt73N0jodMHMoXBOvJwsIpOocGLMGsgNd1w6mjGdqVFVbRVaE+TECN2UtkFGuXfHn0UD8dg/o6GFgB7PPQHpaoX2iSAny89hXnFJWlRZlOvJLxzVtphjRVTPbckPtOrm7dkQNgnR5z1jLGFm8osmz+FM8yPsHDg41gZxKMDUDp7aEh+NVf6d1dzPNSGeBlH0IFLwlYynQVdRu1Si56mlDeoZF+jByYsJdeVelmO34T1sSUGAG5rmdKeWE+gx0Wft64eDtcgzbUrWzOTC4ECEm5dxp6qMBmGSzCyJ47o6rIucwe0MNcVF3WCuOtv2+YiKoAcinzrLbnx+3w= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/7/26 09:05, Chen Wandun wrote: > Add madv_collapse_range to verify the fix for the spurious -EINVAL > returned by madvise_collapse() when the madvised range contains no > complete PMD-aligned window. Do we really need 141 LOC of test to verify a "userspace is being stupid" scenario? Nothing was really broken, it's just a suboptimal return value, or what am I missing? -- Cheers, David