make -C tools/testing/selftests TARGETS=net TEST_PROGS=test_blackhole_dev..sh TEST_GEN_PROGS="" run_tests make: Entering directory '/home/virtme/testing-1/tools/testing/selftests' make[1]: Entering directory '/home/virtme/testing-1/tools/testing/selftests/net' make[1]: Nothing to be done for 'all'. make[1]: Leaving directory '/home/virtme/testing-1/tools/testing/selftests/net' make[1]: Entering directory '/home/virtme/testing-1/tools/testing/selftests/net' TAP version 13 1..1 # timeout set to 6000 # selftests: net: test_blackhole_dev.sh [ 1257.384514] blackhole_netdev_xmit(): Dropping skb. [ 1257.384884] dev_queue_xmit() returned NET_XMIT_SUCCESS [ 1257.404959] test_blackholedev module terminating. # test_blackhole_dev: ok ok 1 selftests: net: test_blackhole_dev.sh make[1]: Leaving directory '/home/virtme/testing-1/tools/testing/selftests/net' make: Leaving directory '/home/virtme/testing-1/tools/testing/selftests' xx__-> echo $? 0 xx__->