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(p200300cbc748ba001c0048ea7b5ac12b.dip0.t-ipconnect.de. [2003:cb:c748:ba00:1c00:48ea:7b5a:c12b]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4215c2cd247sm175758845e9.40.2024.06.11.02.31.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Jun 2024 02:31:32 -0700 (PDT) Message-ID: <6580fccb-cbd8-480b-9405-b6191ae87754@redhat.com> Date: Tue, 11 Jun 2024 11:31:30 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/5] cleanups, fixes, and progress towards avoiding "make headers" To: John Hubbard , Jeff Xu Cc: Andrew Morton , Shuah Khan , Andrei Vagin , Axel Rasmussen , Christian Brauner , Kees Cook , Kent Overstreet , "Liam R . Howlett" , Muhammad Usama Anjum , Peter Xu , Rich Felker , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, LKML References: <20240608021023.176027-1-jhubbard@nvidia.com> <95005e7c-3705-48c5-8ee2-3d9b0688fcbc@nvidia.com> From: David Hildenbrand Content-Language: en-US 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: <95005e7c-3705-48c5-8ee2-3d9b0688fcbc@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 11.06.24 08:25, John Hubbard wrote: > On 6/10/24 9:45 PM, Jeff Xu wrote: >> On Mon, Jun 10, 2024 at 9:34 PM John Hubbard wrote: >>> On 6/10/24 9:21 PM, Jeff Xu wrote: >>>> Hi >>>> >>>> >>>> On Fri, Jun 7, 2024 at 7:10 PM John Hubbard wrote: >>>>> >>>>> Eventually, once the build succeeds on a sufficiently old distro, the >>>>> idea is to delete $(KHDR_INCLUDES) from the selftests/mm build, and then >>>>> after that, from selftests/lib.mk and all of the other selftest builds. >>>>> >>>>> For now, this series merely achieves a clean build of selftests/mm on a >>>>> not-so-old distro: Ubuntu 23.04: >>>>> >>>>> 1. Add __NR_mseal. >>>>> >>>>> 2. Add fs.h, taken as usual from a snapshot of ./usr/include/linux/fs.h >>>>> after running "make headers". This is how we have agreed to do this sort >>>>> of thing, see [1]. >>>>> >>>> What is the "official" way to build selftests/mm ? >>> >>> From Documentation/dev-tools/kselftest.rst, it is: >>> >>> $ make headers >>> $ make -C tools/testing/selftests >>> >>>> I tried a few ways, but it never worked, i.e. due to head missing. >>> >>> You are correct. Today's rules require "make headers" first. But >>> I'm working on getting rid of that requirement, because it causes >>> problems for some people and situations. >>> >>> (Even worse is the follow-up rule, in today's documentation, >>> that tells us to *run* the selftests from within Make! This >>> is just madness. >> >> That is hilarious! :) > > :) > >> >>> Because the tests need to run as root in >>> many cases. And Make will try to rebuild if necessary...thus >>> filling your tree full of root-owned files...but that's for >>> another time.) >>> >>>> >>>> 1> >>>> cd tools/testing/selftests/mm >>>> make >>>> >>>> migration.c:10:10: fatal error: numa.h: No such file or directory >>>> 10 | #include >>>> | ^~~~~~~~ >>>> compilation terminated. >>>> >>>> 2> >>>> make headers >>>> make -C tools/testing/selftests >>>> >>>> make[1]: Entering directory >>>> '/usr/local/google/home/jeffxu/mm/tools/testing/selftests/mm' >>>> CC migration >>>> migration.c:10:10: fatal error: numa.h: No such file or directory >>>> 10 | #include >>>> >>> >>> Well, actually, for these, one should install libnuma-dev and >>> numactl (those are Ubuntu package names. Arch Linux would be: >>> numactl). >>> >>> I think. The idea is: use system headers if they are there, and >>> local kernel tree header files if the items are so new that they >>> haven't made it to $OLDEST_DISTO_REASONABLE. >>> >>> Something like that. >>> >> But I don't want to install random packages if possible. > > Well...keep in mind that it's not really random. If a test program > requires numa.h, it's typically because it also links against libnuma, > which *must* be supplied by the distro if you want to build. Because > it doesn't come with the kernel, of course. > > So what you're really saying is that you'd like to build and run > whatever you can at the moment--the build should soldier on past > failures as much as possible. > >> >> Can makefile rule continue to the next target in case of failure though ? > > That could be done, in general. The question is if that's really what > we want, or should want. Maybe... In cow.c, we warn if liburing is not around and build the test without these test cases. check_config.sh senses support. We could do the same for numactl (numa.h), but maybe there would not be any test case to run in there without libnuma (did not check). Some tests also require lcap. -- Cheers, David / dhildenb