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[2003:d8:2f18:7500:202e:b0f1:76d6:f9af]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4538234b382sm197370235e9.9.2025.07.01.06.18.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Jul 2025 06:18:33 -0700 (PDT) Message-ID: <1d67a048-00c0-4d2b-96ec-5e8d6d672dbd@redhat.com> Date: Tue, 1 Jul 2025 15:18:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] selftests/mm: Add process_madvise() tests To: wang lian , linux-mm@kvack.org, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com Cc: Liam.Howlett@oracle.com, brauner@kernel.org, gkwang@linx-info.com, jannh@google.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, p1ucky0923@gmail.com, ryncsn@gmail.com, shuah@kernel.org, sj@kernel.org, vbabka@suse.cz, zijing.zhang@proton.me References: <20250630140957.4000-1-lianux.mm@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: <20250630140957.4000-1-lianux.mm@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: CMsOcWLTyEQjcXxyShjC9oLKDhHw7tRwnRNFnoeQZ9o_1751375915 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: q7pkq6k7nhrf6b4yzkfje1fx8ni6y9yb X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 2E98F80006 X-Rspam-User: X-HE-Tag: 1751375919-260080 X-HE-Meta: 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 /5lOlaWu 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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 30.06.25 16:09, wang lian wrote: > This patch adds tests for the process_madvise(), focusing on > verifying behavior under various conditions including valid > usage and error cases. > > Signed-off-by: wang lian > Suggested-by: Lorenzo Stoakes > Suggested-by: David Hildenbrand > --- > > Changelog v2: > - Drop MADV_DONTNEED tests based on feedback > - Focus solely on process_madvise() syscall > - Improve error handling and structure > - Add future-proof flag test > - Style and comment cleanups > > tools/testing/selftests/mm/.gitignore | 1 + > tools/testing/selftests/mm/Makefile | 1 + > tools/testing/selftests/mm/process_madv.c | 414 ++++++++++++++++++++++ > tools/testing/selftests/mm/run_vmtests.sh | 5 + > 4 files changed, 421 insertions(+) > create mode 100644 tools/testing/selftests/mm/process_madv.c > > diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore > index 911f39d634be..a8c3be02188c 100644 > --- a/tools/testing/selftests/mm/.gitignore > +++ b/tools/testing/selftests/mm/.gitignore > @@ -42,6 +42,7 @@ memfd_secret > hugetlb_dio > pkey_sighandler_tests_32 > pkey_sighandler_tests_64 > +process_madv > soft-dirty > split_huge_page_test > ksm_tests > diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile > index 2352252f3914..725612e09582 100644 > --- a/tools/testing/selftests/mm/Makefile > +++ b/tools/testing/selftests/mm/Makefile > @@ -86,6 +86,7 @@ TEST_GEN_FILES += mseal_test > TEST_GEN_FILES += on-fault-limit > TEST_GEN_FILES += pagemap_ioctl > TEST_GEN_FILES += pfnmap > +TEST_GEN_FILES += process_madv > TEST_GEN_FILES += thuge-gen > TEST_GEN_FILES += transhuge-stress > TEST_GEN_FILES += uffd-stress > diff --git a/tools/testing/selftests/mm/process_madv.c b/tools/testing/selftests/mm/process_madv.c > new file mode 100644 > index 000000000000..73999c8e3570 > --- /dev/null > +++ b/tools/testing/selftests/mm/process_madv.c > @@ -0,0 +1,414 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > + > +#define _GNU_SOURCE > +#include "../kselftest_harness.h" > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include "vm_util.h" > + > +#include "../pidfd/pidfd.h" > + > +/* > + * Ignore the checkpatch warning, as per the C99 standard, section 7.14.1.1: > + * > + * "If the signal occurs other than as the result of calling the abort or raise > + * function, the behavior is undefined if the signal handler refers to any > + * object with static storage duration other than by assigning a value to an > + * object declared as volatile sig_atomic_t" > + */ > +static volatile sig_atomic_t signal_jump_set; > +static sigjmp_buf signal_jmp_buf; > + > +/* > + * Ignore the checkpatch warning, we must read from x but don't want to do > + * anything with it in order to trigger a read page fault. We therefore must use > + * volatile to stop the compiler from optimising this away. > + */ > +#define FORCE_READ(x) (*(volatile typeof(x) *)x) Instead of copying that, it should probably be moved to vm_util.h. Essentially, also the comments for signal_jump_set are copy-pasted from guard-regions.c. Is there a way to avoid that? For example, we could place stuff like signal_jump_set in vm_util.c instead. > + > +static void handle_fatal(int c) > +{ > + if (!signal_jump_set) > + return; > + > + siglongjmp(signal_jmp_buf, c); > +} Also copy-pasted. > + > +FIXTURE(process_madvise) > +{ > + int pidfd; > + int flag; > +}; > + > +static void setup_sighandler(void) > +{ > + struct sigaction act = { > + .sa_handler = &handle_fatal, > + .sa_flags = SA_NODEFER, > + }; > + > + sigemptyset(&act.sa_mask); > + if (sigaction(SIGSEGV, &act, NULL)) > + ksft_exit_fail_perror("sigaction"); > +} > + > +static void teardown_sighandler(void) > +{ > + struct sigaction act = { > + .sa_handler = SIG_DFL, > + .sa_flags = SA_NODEFER, > + }; > + > + sigemptyset(&act.sa_mask); > + sigaction(SIGSEGV, &act, NULL); > +} These two as well. Let's avoid that much copy-pasting. -- Cheers, David / dhildenb