selftests/bpf: Skip loading bpf_testmod when using -l to list tests.

When using "-l", test_progs often is executed as non-root user,
load_bpf_testmod() will fail and output errors. This patch skips loading bpf
testmod when "-l" is specified, making output cleaner.

Signed-off-by: Yucong Sun <fallentree@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210817044732.3263066-2-fallentree@fb.com

diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index 6f10310..532af33 100644 (file)
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -755,7 +755,7 @@ int main(int argc, char **argv)
        save_netns();
        stdio_hijack();
        env.has_testmod = true;
-       if (load_bpf_testmod()) {
+       if (!env.list_test_names && load_bpf_testmod()) {
                fprintf(env.stderr, "WARNING! Selftests relying on bpf_testmod.ko will be skipped.\n");
                env.has_testmod = false;
        }
@@ -803,7 +803,7 @@ int main(int argc, char **argv)
                if (test->need_cgroup_cleanup)
                        cleanup_cgroup_environment();
        }
-       if (env.has_testmod)
+       if (!env.list_test_names && env.has_testmod)
                unload_bpf_testmod();
        stdio_restore();