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[2003:d8:2f22:600:53c7:df43:7dc3:ae39]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45a22321985sm119855405e9.17.2025.08.18.00.56.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Aug 2025 00:56:22 -0700 (PDT) Message-ID: <5f9eeb98-9881-4c46-93f9-e13419d92b61@redhat.com> Date: Mon, 18 Aug 2025 09:56:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 1/1] selftests/mm/uffd: Refactor non-composite global vars into struct To: Ujwal Kundur , akpm@linux-foundation.org, peterx@redhat.com, jackmanb@google.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250817065211.855-1-ujwal.kundur@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 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: <20250817065211.855-1-ujwal.kundur@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: T9ZD0vIP1TCkEEG8xEUvWDBzibx3FaPZk2cF-ZS7kHA_1755503784 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 7C73940005 X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: zj99j63eiyf9o9a79gqp6anchrpngu7m X-HE-Tag: 1755503787-277317 X-HE-Meta: U2FsdGVkX1/A/ODeCn1hti9ze6dMjGqEdwHeULR83x2dwivC7FB1MRfIJdxxGdJ0S4F4jn5q2X2NF6wdVIBpPQq2CuEjqWk+AFy0Ms0JmioqvQEX2xzyOg5yeQTFPbIGatWF7ntHYoHQHwCU4vHixNfcVKpNiaffzkG2udUI84Ra76FdzeWgxoztpIIbp8MzElVVBtnf567amEbmSRBV4Bzkl+tIlAB1Bz/U/ler56ZmM3B6SBWIsybIOwvFO5DOXjAPKCAuESFoqNT14RxHbMlSiDCRRadRb9c3ulKFeGUArYSifwJdRxvkwXA6kupQiXP+l5HJfrIjUJlQIfpdpM2v90lXppqCOuFtCd1FBs/Y6MsuFpA+8139UxX108HDJWmIi+e1H2HPnxxMM+wQAqHaTdFNbhT9+Yv8ETZKmz34bTtGk5adpLM6xMlnh0s5lTu7Uo71HugvfRoMTPV1lh2OgTUCKMbM3r0Ao8Zmqf16Qf6GfdIjPiYOotWCRzleVQeYTqbxMXJmngYCjTHB+XgVetas2ZFYWI5OdM2ufLa1y8BVCkaduNPGBhkMnZfY8u3HjTDk8JwAxjkdb0rLJU6qjAwHPGGvRiTCA8xVsPSTfBdUIvfax6SoOHu1OjqE23tsQbTxDmxbEt7338SKiYpofmSZKc+tUaMavmfxzlOezDQCPltHOWkVjoIpzg4uHb8TfsMF8zkIGUqjdlaMJfagYbHmIjYKKSx4wM78wSXqQhid6/1+PxTP3wjW4pgLOQ5U71M7Dstzh58DfoTATk0WpwJ/WhnRiV2KQFvCuT2x6uAk68XfBV0h+9A3KrRUWEnP85OEhaaftb8gWcaiJGtxwZ/i1t06msSC7G8KyOWSx/xQkUOAkuqAS2BohzVvRDSpkw0XLUXZJWmfSVN+Pd+sfhhdwCp3/R0nG9hyQZQHR3g4ZhkUei/4uo4yPvJDVNK2cvEt7aC2/6Msq0c npYx+ag8 6K4+bBpWtzE8AB+i21mcNffOrlWeZI/LEhSvfpFgm6i5gJkblrI7RCFm+hBNnkt0Ykp42gMBWe9Nrjhw90jXHFhlw8ZjTWhgef2w4RvLgyOwR8nFBVkljCA3aiw== 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 17.08.25 08:52, Ujwal Kundur wrote: > Refactor macros and non-composite global variable definitions into a > struct that is defined at the start of a test and is passed around > instead of relying on global vars. > > Signed-off-by: Ujwal Kundur > Acked-by: Peter Xu > --- > Previous versions and discussion at: > https://lore.kernel.org/all/20250702152057.4067-1-ujwal.kundur@gmail.com/ > > Changes since v6: > - rebased on 6.17-rc1 changes (cd79a1d9b08a) > - removes unused args and adds the __unused attribute; since change > is cosmetic-only, carry forward Acked-by tag > - verified output remains unchanged using virtme-ng > Changes since v5: > - ensure uffd_global_test_opts_t instances are initialized > - verified output remains unchanged using virtme-ng > Changes since v4: > - define gopts as global within uffd-stress.c to retain existing > sigalrm handler logic > Changes since v3: > - more formatting fixes > Changes since v2: > - redo patch on mm-new branch > Changes since v1: > - indentation fixes > - squash into single patch to assist bisections > > tools/testing/selftests/mm/uffd-common.c | 275 ++++----- > tools/testing/selftests/mm/uffd-common.h | 78 +-- > tools/testing/selftests/mm/uffd-stress.c | 228 ++++---- > tools/testing/selftests/mm/uffd-unit-tests.c | 561 ++++++++++--------- > tools/testing/selftests/mm/uffd-wp-mremap.c | 23 +- > 5 files changed, 623 insertions(+), 542 deletions(-) That's a lot of churn, but sounds reasonable. Only skimmed over it and found two nits. > > diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c > index e309ec886fa7..f4e9a5f43e24 100644 > --- a/tools/testing/selftests/mm/uffd-common.c > +++ b/tools/testing/selftests/mm/uffd-common.c > @@ -7,18 +7,30 @@ > > #include "uffd-common.h" > > -#define BASE_PMD_ADDR ((void *)(1UL << 30)) > - > -volatile bool test_uffdio_copy_eexist = true; > -unsigned long nr_parallel, nr_pages, nr_pages_per_cpu, page_size; > -char *area_src, *area_src_alias, *area_dst, *area_dst_alias, *area_remap; > -int uffd = -1, uffd_flags, finished, *pipefd, test_type; > -bool map_shared; > -bool test_uffdio_wp = true; > -unsigned long long *count_verify; > uffd_test_ops_t *uffd_test_ops; > uffd_test_case_ops_t *uffd_test_case_ops; > -atomic_bool ready_for_fork; > + > +#define BASE_PMD_ADDR ((void *)(1UL << 30)) > + > +/* pthread_mutex_t starts at page offset 0 */ > +pthread_mutex_t *area_mutex(char *area, unsigned long nr, uffd_global_test_opts_t *gopts) > +{ > + return (pthread_mutex_t *) (area + nr * gopts->page_size); > +} > + > +/* > + * count is placed in the page after pthread_mutex_t naturally aligned > + * to avoid non alignment faults on non-x86 archs. > + */ > +volatile unsigned long long *area_count( > + char *area, unsigned long nr, > + uffd_global_test_opts_t *gopts) You can fit some parameters into the first line to make this look less weird. [...] > } > > diff --git a/tools/testing/selftests/mm/uffd-wp-mremap.c b/tools/testing/selftests/mm/uffd-wp-mremap.c > index b2b6116e6580..ec860625b25b 100644 > --- a/tools/testing/selftests/mm/uffd-wp-mremap.c > +++ b/tools/testing/selftests/mm/uffd-wp-mremap.c > @@ -152,7 +152,11 @@ static bool range_is_swapped(void *addr, size_t size) > return true; > } > > -static void test_one_folio(size_t size, bool private, bool swapout, bool hugetlb) > +static void test_one_folio(uffd_global_test_opts_t *gopts, > + size_t size, > + bool private, > + bool swapout, > + bool hugetlb) Please avoid that. static void test_one_folio(uffd_global_test_opts_t *gopts, size_t size, bool private, bool swapout, bool hugetlb) -- Cheers David / dhildenb