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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3609a892324sm694287f8f.6.2024.06.17.01.01.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Jun 2024 01:01:45 -0700 (PDT) Message-ID: <3f5ad53c-f473-469a-a834-afb9b069cb13@redhat.com> Date: Mon, 17 Jun 2024 10:01:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm:fix test_prctl_fork_exec return failure To: aigourensheng , akpm@linux-foundation.org Cc: shuah@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20240617052934.5834-1-shechenglong001@gmail.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20240617052934.5834-1-shechenglong001@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 1816614001E X-Stat-Signature: 5k7yw6ymfrbjxzx9sc87wsxfcyipeub5 X-HE-Tag: 1718611310-29183 X-HE-Meta: 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 Q5LQ9Ze2 Eyc2Sv0tja8j7IoIjWOw0I+/VSeRzKdpBHw1yO1vkZ84igTbRDpNQCh8uaIXfCyFHsoxKvNjSsoJ9QojCVPuGsywJBRlzJfOz8aDpmEGI9+OOvkbqKeQ17IrSL9yVHjD3A3eoLeOxRHFYcqWajlzHEnpK+t+QoG/8/MK83Cp5wTa5EN8jFDbjHQtrBH+w9zoHYhL5bEVgfhlbTpEBpMHkgbajaBZ3BoWe+MLo0Deb1nbCI3X9BJ0ZdokslWbrjZypuZnS+si0IgTJqmBB74LWZGW90SwGvmGAtAmDv2K1cAvbbWreW77Ia7bnmzo8eMWy7CjMVGlp8A2D9PE/hsMUKHwNQrDCfLffTCk1aZ33tIpPw4eFlhv8cbJfJwtBz/jyzE3C5osYWasy6rlrQSmQZM56moKbaGuwclm6pic8xJpSu0Y2EPBDXz8mkTi1vjptdPRsW+DE3wH6xyiyBDgsG5AVTOQFUFMmksSHndOAILncNUw= 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 17.06.24 07:29, aigourensheng wrote: > after calling fork() in the test_prctl_fork_exec() function, > the global variable ksm_full_scans_fd is initialized to 0 > in the child process upon entering the main function > of ./ksm_functional_tests. > In the function call chain test_child_ksm() -> > __mmap_and_merge_range -> ksm_merge-> ksm_get_full_scans, > start_scans = ksm_get_full_scans() will return an error. > Therefore, the value of ksm_full_scans_fd needs to be > initialized before calling test_child_ksm in the child process. > > Signed-off-by: aigourensheng > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb