From 5bb36cd12006500fe6b96c17c2fbe870ae89eb96 Mon Sep 17 00:00:00 2001 From: Kuba Pawlak Date: Fri, 4 Sep 2026 16:03:34 +0200 Subject: [PATCH] selftests: net: Skip so_incoming_cpu on single-CPU systems The test requires at least two CPUs to exercise the distribution of connections between per-CPU listeners. It currently enforces this prerequisite with an assertion, causing all test cases to fail on single-vCPU systems even though no kernel functionality was tested. Report the unsupported environment as a skip instead. Check the prerequisite before setting up the network namespace so skipped tests do not make unnecessary system changes. Link: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/2023546 Signed-off-by: Kuba Pawlak Link: https://patch.msgid.link/20260904140334.562593-1-kuba.pawlak@canonical.com Signed-off-by: Jakub Kicinski --- tools/testing/selftests/net/so_incoming_cpu.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/net/so_incoming_cpu.c b/tools/testing/selftests/net/so_incoming_cpu.c index 4740701f1a9a..1b73442386ae 100644 --- a/tools/testing/selftests/net/so_incoming_cpu.c +++ b/tools/testing/selftests/net/so_incoming_cpu.c @@ -81,10 +81,11 @@ static int nr_client_per_server, nr_server, nr_client; FIXTURE_SETUP(so_incoming_cpu) { - setup_netns(_metadata); - nr_server = get_nprocs(); - ASSERT_LE(2, nr_server); + if (nr_server < 2) + SKIP(return, "requires at least two CPUs"); + + setup_netns(_metadata); if (NR_CLIENT_PER_SERVER_DEFAULT * nr_server < NR_PORT) nr_client_per_server = NR_CLIENT_PER_SERVER_DEFAULT;