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b=Z//QVUE1GnHBGMaWgJTJyKF7qhlNX9G/P1wEgSjJPMjcxdPbi8Iv2wQVGKz5UUDdo 4zpFVmESnVz4I3S2DT764lLMxbRFjktGsFau54l92KImS2rU0NMZJv1hSdvybY0Xg5 DZUCgvw5u/4bEGE2kV5+9ea/ans6d0rYLQofsBg582EX2Okl+bfym5HF/DOgijOZTv Op8yakmihGw+NiVEkZPqyLHzxwYNl1nvPRghurehhDSdb4ngiZRWYbcOyYAqWRZCoM hwO2+QPg+mTQ4xZ7bJJsEtmTJScmBjnhbovLqbwVh8MaRIxAZTbprx7VPpwsdeCED9 pVLQy1kX0XuTw== Message-ID: Date: Tue, 25 Aug 2026 10:37:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/2] support kselftest on nommu platform To: Hajime Tazaki , linux-mm@kvack.org, liam@infradead.org, rbm@suse.com, akpm@linux-foundation.org, luto@amacapital.net, brendan.jackman@linux.dev, liuhangbin@gmail.com, corbet@lwn.net, kees@kernel.org, ljs@kernel.org, broonie@kernel.org, mhocko@suse.com, rppt@kernel.org, shuah@kernel.org, surenb@google.com, vbabka@kernel.org, wad@chromium.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-um@lists.infradead.org Cc: geert@linux-m68k.org, daniel@thingy.jp References: <20260825015945.141739-1-thehajime@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: xe37k9h9wguwrytudx9at9i46byxnsz9 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: B9260160006 X-HE-Tag: 1787647070-619818 X-HE-Meta: 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 zaP3Lta+ N0E3wW0UGwgWPyT0+Eh8wCWBnOc3o2qjM0P+oVeXzU1YY5mttzozoEe/qqzsptNctJP5cJxRRy8Z9jp2Gnr4LFooT1Hmce3Qzg/GIweHJcwhx1kA+paMoV71dJqzD9qz7Onzy2tltKgRu/Y92GMHCtIfkzRO3YSld8KpKQvA/ETxzCecmJg+8sEmlF58SfL91VNx0HTrlGke7znn24YKJjg+d4Z5t9BC2z4Jsq6hakPPRreQSTSovTAW81NA4smnuwe+VEXXh25T2Cb3k1lP8QrTdW1u1V8qQFrqoMpX53SBy0mlHdDm3MKFOkA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/25/26 03:59, Hajime Tazaki wrote: > We add an ability to execute kselftest on nommu platforms. > > Currently there are several issues if we wish to run kselftests on nommu > targets: > > - it cannot compile/build test binaries because the current files mainly > assume to build with glibc, > - some of the tests are not able to run on nommu targets as there are no > fork(2) syscall. > > The first issue can be avoided if we can build static PIE binaries (if > targets support it), but in our case (build on ubuntu/glibc and run on > alpine/musl-libc), it fails to invoke due to lack of the GNU ifunc > mechanism. Thus, we need to cross-compile with musl toolchain, which > needs to be solved the first issue. > > The second issue is the lack of fork(2) syscall on those platforms. > Especially the test harness helper (kselftest_harness.h) uses the > syscall, which cannot be simply with vfork(2). `timeout` command used > in `runner.sh` never works for nommu platform as it uses fork(2). > > nommu component in the mm subsystem has several known issues and having > test cases should help this situation, thus this patchset is very first > step toward enriching test environment which has not been well tested > for a while. The test cases is implemented based on the document > (Documentation/admin-guide/mm/nommu-mmap.rst). > > So, for the first step, nommu targets only support low-level API of > kselftests (kselftest.h), and implement tests in a new target, > TARGETS=mm/nommu. Other targets are currently not even able to build > due to toolchain issues but will be addressed once the initial > introduction which mainly focuses on nommu test will be settled. > > The patch was initially combined with other patches but is decoupled to > only focus on test framework and testcases. > > - rfc: > https://lore.kernel.org/linux-mm/20260813063401.1786548-1-thehajime@gmail.com/ > > Hajime Tazaki (2): > selftests: run tests on nommu architecture > selftests/mm: add nommu mmap and mremap behavior tests > > Documentation/dev-tools/kselftest.rst | 14 + > tools/testing/selftests/Makefile | 1 + > tools/testing/selftests/kselftest/runner.sh | 9 +- > tools/testing/selftests/kselftest_harness.h | 4 + > tools/testing/selftests/lib.mk | 8 + > tools/testing/selftests/mm/nommu/Makefile | 7 + > .../selftests/mm/nommu/nommu_mmap_test.c | 265 +++++++++++++ > .../selftests/mm/nommu/nommu_mremap_test.c | 353 ++++++++++++++++++ That's odd. tools/testing/selftests/mm itself should know which tests can be built and ran on nommu. nommu-only tests can be placed in mm/nommu, but I would expect tools/testing/selftests/mm's Makefile and run script to compile and run only selftests that are supported on the given platform. -- Cheers, David