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[107.190.31.93]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e84219e8c9sm72720135ad.23.2026.10.14.12.51.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Oct 2026 12:51:28 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 14 Oct 2026 19:51:26 +0000 Message-Id: Cc: , , Subject: Re: [PATCH bpf-next 0/2] selftests/bpf: Skip libarena when arena spin locks are unsupported From: "Emil Tsalapatis" To: "Qiliang Yuan" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "Jiri Olsa" , "Emil Tsalapatis" , "Ihor Solodrai" , "Shuah Khan" X-Mailer: aerc 0.21.0 References: <20261009-selftests-bpf-libarena-nr-cpus-v1-0-e726ccc66fc6@gmail.com> In-Reply-To: <20261009-selftests-bpf-libarena-nr-cpus-v1-0-e726ccc66fc6@gmail.com> On Fri Oct 9, 2026 at 1:49 AM UTC, Qiliang Yuan wrote: > serial_test_libarena runs the test programs of libarena, whose buddy > allocator serializes its operations with an arena spin lock. > > arena_spin_lock() fails with -EOPNOTSUPP on kernels built with more > than 1024 possible CPUs, as distributions commonly configure them. > buddy_init() reports that as -EINVAL, and every test then fails at > arena_buddy_reset. > > Patch 1 makes buddy_init() return the error of the lock, patch 2 skips > the tests when resetting the allocator fails with -EOPNOTSUPP. > If new kernels expect more than 1024 CPUs, we should update libarena and arena_spin_lock() to support them instead of returning EOPNOTSUPP. pw-bot: cr > Signed-off-by: Qiliang Yuan > --- > Qiliang Yuan (2): > selftests/bpf: Return the lock error from buddy_init() of libarena > selftests/bpf: Skip libarena on kernels with too many possible CPUs > > tools/testing/selftests/bpf/libarena/src/buddy.bpf.c | 5 +++-- > tools/testing/selftests/bpf/prog_tests/libarena.c | 9 +++++++++ > 2 files changed, 12 insertions(+), 2 deletions(-) > --- > base-commit: e1d84a37cba984388988d2f1ddc84561413f0db2 > change-id: 20261009-selftests-bpf-libarena-nr-cpus-50fc5dd00fe2 > > Best regards,