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Thu, 08 Oct 2026 18:49:55 -0700 (PDT) From: Qiliang Yuan Subject: [PATCH bpf-next 0/2] selftests/bpf: Skip libarena when arena spin locks are unsupported Date: Fri, 09 Oct 2026 09:49:50 +0800 Message-Id: <20261009-selftests-bpf-libarena-nr-cpus-v1-0-e726ccc66fc6@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAD5IyGoC/x2N0QrCMAwAf2Xk2UBWmKC/Ij50bbIFRi1JlcHYv 1t9vIe7O8DZlB3uwwHGH3V9lQ7jZYC0xrIwau4MgcJ1JLqh8yaNvTnOVXDTORqXiMUw1bfjRJK mnImEA/RINRbd/4MH/IzCe4PneX4Bx3hJinoAAAA= To: 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 Cc: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Qiliang Yuan X-Mailer: b4 0.13.0 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. 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, -- Qiliang Yuan