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[PATCH v6 5/5] selftests/mm: add UFFDIO_MOVE ioctl test To: David Hildenbrand , Suren Baghdasaryan , Mark Brown Cc: akpm@linux-foundation.org, viro@zeniv.linux.org.uk, brauner@kernel.org, shuah@kernel.org, aarcange@redhat.com, lokeshgidra@google.com, peterx@redhat.com, ryan.roberts@arm.com, hughd@google.com, mhocko@suse.com, axelrasmussen@google.com, rppt@kernel.org, willy@infradead.org, Liam.Howlett@oracle.com, jannh@google.com, zhangpeng362@huawei.com, bgeffon@google.com, kaleshsingh@google.com, ngeoffray@google.com, jdduke@google.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@android.com, Peter Zijlstra References: <20231206103702.3873743-1-surenb@google.com> <20231206103702.3873743-6-surenb@google.com> <50385948-5eb4-47ea-87f8-add4265933d6@redhat.com> <6a34b0c9-e084-4928-b239-7af01c8d4479@sirena.org.uk> <3240f4b5-081b-4075-851a-7d1cd86f4333@redhat.com> Content-Language: en-US From: John Hubbard 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 ZCQqhMCe R5t9v5QgbWD63o1I+JHDhtLhQjSlTgBGDFPVjLgpLYu8YI4FEmqgTSL6ARU/qV2UJEM4fB0AzeY1RQDWg5mv+LvZQpXne3d4q4pmkEGSY+5clwptl4ednzvfDA5Gqm+G8q0DSuXvBT/PccD/T78OiRZ5F0GOg7+U24snst9Fogc0h9oV3pKk6EGeJbv17mDvwQxZDtIzgXUKHVSUgpyUqhz6izYh8q5TvNwT8yyoJp5lhVeIS8tS/BK/K822tcEwiJdHVtOpidb7qwex3TJQ7IfuIRRxpzQ5OL4MNEecYP150Rtk= 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 12/11/23 08:32, David Hildenbrand wrote: ... > That's an open question: do we want to be able to build selftests > against any host headers, and not the in-tree headers that have to be > manually installed and dirty the git tree? > > One obvious drawbacks is that we'll have to deal with all that using a > bunch of #ifdef, and the tests that will be built+run will depend on the > host headers. > > Especially the letter is relevant I think: Our upstream testing won't be > able to build+run tests that rely on new upstream features. But that's > what some key benefit of these selftests, and being able to run them > automatically on a bunch of different combinations upstream. > > Further, the tests are closely related to the given kernel version, they > are not some completely separate tests. > > > Moving the the (MM?) selftests to a separate repository would make the > decision easier: just like in QEMU etc, we'd simply pull in a headers > update and only build against these archived headers. > > So I see the options: > > (1) Rely on installing the proper in-tree headers. Build will fail if >     that is not happening. > > (2) Make the tests build with any host headers. > > (3) Regularly archive the required headers in the selftest directory >     like external projects like QEMU do. Or (4) Hack in little ifdef snippets, into the selftests, like we used to do. Peter Zijlstra seems to be asking for this, if I understand his (much) earlier comments about this. thanks, -- John Hubbard NVIDIA