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b=YZhTD0FiEpC1v9A9DTW8qLWaRrcKfDrjjLChQDcptBvKIsImsKEUKGBSKlJyfJmdd I0QGMmdz3fjmS0soz1fMvxVU6KbwOFZ4F7wTgI+YaHBprRma5cClxEHuTFSgBbUTz9 342VtMTraCKl161ll1VexZdq5O2bF5VSE8b6W/1HGzt/yVGb7n62kTCduc3Xw2Wlfe lccAhUuMK6Rx+zPALmV5y+eoVxNca3Cs9RRcNM6nPCnYZUV9SBPV1P/CI2aTonFhJS Cv/9WMyy96aEXrZZhQZpAh93EtStoY57LcPz+4Hfp+Vo8q4d40QwS/zyrdqAnsTxSG yV2cEM6w75MPg== Message-ID: <440fbabf-636d-4a8e-a720-3fe6f5f268da@kernel.org> Date: Thu, 30 Jul 2026 18:52:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm: make libnuma-dependent tests optional To: Jiangshan Yi Cc: 13667453960@163.com, akpm@linux-foundation.org, liam@infradead.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@suse.com, rppt@kernel.org, shuah@kernel.org, surenb@google.com, vbabka@kernel.org References: <20260730153344.3149433-1-yijiangshan@kylinos.cn> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: pu1187xpbmizccf1hjwh8nw7hd5nh44y X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2EC40A0012 X-HE-Tag: 1785430370-346342 X-HE-Meta: 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 q524aHig QBpDKDA24Ifm9s4w4apivPzZgUkoYVs/4YvfpNDLxVwsnX00W+rVAWD+Wb2aOgKhFp2nTLtk6RxhhlFth+FTvY4H+MrM6OPIo0/0us+aFdm5TT+T6+RwujeaKHr/TjrNf+W+y2XtjJVSNyR73yzZCpkAxELEyTKutNYD7EX+FqPaSHwLTMk8HNhUNJZEufiURrHPrej44fYfWOWY+gBC8gTjA5j8t2rZP4zuRCzqpYNoudSM18QueZvAqQfW1dWL4lfS17Q4889B5Pup7Jeb8Yi0YXTLo39eo8eN0 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/30/26 17:33, Jiangshan Yi wrote: > Hi David, > > Thanks for the review and the historical context — very helpful. > > You're right that the situations aren't parallel: liburing was made optional > because it wasn't universally easy to obtain at the time, whereas libnuma is > well established and trivial to install on most setups. My cover letter leaned > too heavily on that analogy without articulating the actual motivation — my > mistake. > > The scenario I'm trying to address is the *minimal container / cross-build* > one: some CI images and embedded build environments deliberately omit > libnuma-dev to keep the footprint small, or because the target has no NUMA > topology. There, `migration`, `ksm_tests`, and `rmap` fail at **compile** time > (`#include ` not found), and `make` exits non-zero — so the CI step is > judged failed even though the dozens of NUMA-independent tests would build > fine. The goal isn't to spare users the install, but to stop a missing optional > library from failing the whole `make`. > > That said, your comment makes me reconsider whether silent skipping is the > right policy for selftests. I'd be happy to switch to: keep the tests > enabled-by-default, but on missing libnuma print a clear notice ("install > libnuma-dev to enable NUMA-dependent tests") and continue building the rest, > rather than aborting. This stays closer to the "run as much as possible" > philosophy while still guiding the user to the missing dependency. > > If neither direction is of interest, I'll drop the patch — no point adding > maintenance surface for a problem that isn't real in practice. But if the > minimal-container scenario resonates, I'll respin a v2 with proper motivation > in the commit message. I'd say we just keep it as is: the more you remove, the less you test, the less helpful the test result is as a whole? -- Cheers, David