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Date:   Tue, 18 Aug 2020 17:41:57 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Carlos Neira <cneirabustos@...il.com>
Cc:     Networking <netdev@...r.kernel.org>, Yonghong Song <yhs@...com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        bpf <bpf@...r.kernel.org>, Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH v5] bpf/selftests: fold test_current_pid_tgid_new_ns into test_progs.

On Tue, Aug 18, 2020 at 1:44 PM Carlos Neira <cneirabustos@...il.com> wrote:
>
> Currently tests for bpf_get_ns_current_pid_tgid() are outside test_progs.
> This change folds a test case into test_progs.
>
> Changes from V4:
>  - Added accidentally removed blank space in Makefile.
>  - Added () around bit-shift operations.
>  - Fixed not valid C89 standard-compliant code.
>
> Signed-off-by: Carlos Neira <cneirabustos@...il.com>
> Acked-by: Andrii Nakryiko <andriin@...com>
> ---
>  tools/testing/selftests/bpf/.gitignore        |   2 +-
>  tools/testing/selftests/bpf/Makefile          |   2 +-
>  .../bpf/prog_tests/ns_current_pid_tgid.c      |  85 ----------
>  .../bpf/prog_tests/ns_current_pidtgid.c       |  55 ++++++
>  .../bpf/progs/test_ns_current_pid_tgid.c      |  37 ----
>  .../bpf/progs/test_ns_current_pidtgid.c       |  25 +++
>  .../bpf/test_current_pid_tgid_new_ns.c        | 159 ------------------
>  .../bpf/test_ns_current_pidtgid_newns.c       |  91 ++++++++++
>  8 files changed, 173 insertions(+), 283 deletions(-)
>  delete mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pidtgid.c
>  delete mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pidtgid.c
>  delete mode 100644 tools/testing/selftests/bpf/test_current_pid_tgid_new_ns.c
>  create mode 100644 tools/testing/selftests/bpf/test_ns_current_pidtgid_newns.c
>
> diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
> index 1bb204cee853..022055f23592 100644
> --- a/tools/testing/selftests/bpf/.gitignore
> +++ b/tools/testing/selftests/bpf/.gitignore
> @@ -30,8 +30,8 @@ test_tcpnotify_user
>  test_libbpf
>  test_tcp_check_syncookie_user
>  test_sysctl
> -test_current_pid_tgid_new_ns
>  xdping
> +test_ns_current_pidtgid_newns
>  test_cpp
>  *.skel.h
>  /no_alu32
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index e7a8cf83ba48..e308cc7c8598 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -37,7 +37,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
>         test_cgroup_storage \
>         test_netcnt test_tcpnotify_user test_sock_fields test_sysctl \
>         test_progs-no_alu32 \
> -       test_current_pid_tgid_new_ns
> +       test_ns_current_pidtgid_newns

Have you tried doing a parallel build with make -j$(nproc) or
something like that? It fails for me:

test_ns_current_pidtgid_newns.c:6:10: fatal error:
test_ns_current_pidtgid.skel.h: No such file or directory

 #include "test_ns_current_pidtgid.skel.h"

          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The problem seems to be that you haven't recorded dependency on the
skeleton file for this new test_ns_current_pidtgid_newns.

But rather than fixing it, let's just fold
test_ns_current_pidtgid_newns into test_progs as well? Then all such
issues will be handled automatically and this test will be executed
regularly.

>
>  # Also test bpf-gcc, if present
>  ifneq ($(BPF_GCC),)

[...]

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