BPF List
 help / color / mirror / Atom feed
From: Stanislav Fomichev <sdf@google.com>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
	 andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
	 yonghong.song@linux.dev, kpsingh@kernel.org, haoluo@google.com,
	 jolsa@kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH bpf-next 2/2] selftests/bpf: Add selftest for sleepable bpf_task_under_cgroup()
Date: Thu, 5 Oct 2023 10:13:40 -0700	[thread overview]
Message-ID: <ZR7uxCMaWlfEBkBJ@google.com> (raw)
In-Reply-To: <20231005083953.1281-2-laoar.shao@gmail.com>

On 10/05, Yafang Shao wrote:
> The result as follows,
> 
>   $ tools/testing/selftests/bpf/test_progs --name=task_under_cgroup
>   #237     task_under_cgroup:OK
>   Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
> 
> And no error messages in dmesg.
> 
> Without the prev patch, there will be RCU warnings in dmesg.
> 
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> ---
>  .../selftests/bpf/prog_tests/task_under_cgroup.c   |  8 +++++--
>  .../selftests/bpf/progs/test_task_under_cgroup.c   | 28 +++++++++++++++++++++-
>  2 files changed, 33 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c b/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c
> index 4224727..d1a5a5c 100644
> --- a/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c
> +++ b/tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c
> @@ -30,8 +30,12 @@ void test_task_under_cgroup(void)
>  	if (!ASSERT_OK(ret, "test_task_under_cgroup__load"))
>  		goto cleanup;
>  
> -	ret = test_task_under_cgroup__attach(skel);
> -	if (!ASSERT_OK(ret, "test_task_under_cgroup__attach"))
> +	skel->links.lsm_run = bpf_program__attach_lsm(skel->progs.lsm_run);
> +	if (!ASSERT_OK_PTR(skel->links.lsm_run, "attach_lsm"))
> +		goto cleanup;
> +

So we rely on the second attach here to trigger the program above?
Maybe add a comment? Otherwise we might risk loosing this dependency
after some refactoring...

Other than that, both patches look good to me, feel free to use for both
if/when you resend:

Acked-by: Stanislav Fomichev <sdf@google.com>

  reply	other threads:[~2023-10-05 17:13 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-05  8:39 [PATCH bpf-next 1/2] bpf: Fix missed rcu read lock in bpf_task_under_cgroup() Yafang Shao
2023-10-05  8:39 ` [PATCH bpf-next 2/2] selftests/bpf: Add selftest for sleepable bpf_task_under_cgroup() Yafang Shao
2023-10-05 17:13   ` Stanislav Fomichev [this message]
2023-10-06  2:17     ` Yafang Shao

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ZR7uxCMaWlfEBkBJ@google.com \
    --to=sdf@google.com \
    --cc=andrii@kernel.org \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=haoluo@google.com \
    --cc=john.fastabend@gmail.com \
    --cc=jolsa@kernel.org \
    --cc=kpsingh@kernel.org \
    --cc=laoar.shao@gmail.com \
    --cc=martin.lau@linux.dev \
    --cc=song@kernel.org \
    --cc=yonghong.song@linux.dev \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox