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Date:   Tue, 1 Sep 2020 17:41:37 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next v2 2/2] selftests/bpf: test task_file iterator
 without visiting pthreads

On Thu, Aug 27, 2020 at 10:38 PM Yonghong Song <yhs@...com> wrote:
>
> Modified existing bpf_iter_test_file.c program to check whether
> all accessed files from the main thread or not.
>
> Modified existing bpf_iter_test_file program to check
> whether all accessed files from the main thread or not.
>   $ ./test_progs -n 4
>   ...
>   #4/7 task_file:OK
>   ...
>   #4 bpf_iter:OK
>   Summary: 1/24 PASSED, 0 SKIPPED, 0 FAILED
>
> Signed-off-by: Yonghong Song <yhs@...com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  .../selftests/bpf/prog_tests/bpf_iter.c       | 21 +++++++++++++++++++
>  .../selftests/bpf/progs/bpf_iter_task_file.c  | 10 ++++++++-
>  2 files changed, 30 insertions(+), 1 deletion(-)
>

[...]

> +       if (CHECK(pthread_join(thread_id, &ret) || ret != NULL,
> +                 "pthread_join", "pthread_join failed\n"))
> +               goto done;
> +
> +       CHECK(skel->bss->count != 0, "",

nit: please use non-empty string for second argument

> +             "invalid non pthread file visit %d\n", skel->bss->count);
> +
> +done:
>         bpf_iter_task_file__destroy(skel);
>  }
>

[...]

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