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Thu, 08 Oct 2026 18:50:03 -0700 (PDT) From: Qiliang Yuan Date: Fri, 09 Oct 2026 09:49:52 +0800 Subject: [PATCH bpf-next 2/2] selftests/bpf: Skip libarena on kernels with too many possible CPUs 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 Message-Id: <20261009-selftests-bpf-libarena-nr-cpus-v1-2-e726ccc66fc6@gmail.com> 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> 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 every test program of libarena, most of them after resetting the buddy allocator with arena_buddy_reset. The buddy allocator takes an arena spin lock, which fails with -EOPNOTSUPP on kernels built with more than 1024 possible CPUs, as distributions commonly configure them. Every test then fails at arena_buddy_reset, while the arena_spin_lock test already skips in that case. Reset the allocator once before running the tests, and skip them when that returns -EOPNOTSUPP. Fixes: b1487dc1b181 ("selftests/bpf: Add selftests for libarena buddy allocator") Signed-off-by: Qiliang Yuan --- tools/testing/selftests/bpf/prog_tests/libarena.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/libarena.c b/tools/testing/selftests/bpf/prog_tests/libarena.c index daade4150af66..070a08856ee04 100644 --- a/tools/testing/selftests/bpf/prog_tests/libarena.c +++ b/tools/testing/selftests/bpf/prog_tests/libarena.c @@ -240,6 +240,15 @@ void serial_test_libarena(void) if (!ASSERT_OK(ret, "arena_alloc_reserve")) goto out; + /* Skip on kernels with more possible CPUs than arena spin locks support */ + ret = libarena_run_prog(bpf_program__fd(skel->progs.arena_buddy_reset)); + if (ret == -EOPNOTSUPP) { + test__skip(); + goto out; + } + if (!ASSERT_OK(ret, "arena_buddy_reset")) + goto out; + bpf_object__for_each_program(prog, skel->obj) { const char *name = bpf_program__name(prog); -- 2.43.0