linux-kernel - Re: [PATCH bpf-next v3 2/4] bpf: Add log for attaching tracing programs to functions in deny list

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Message-ID: <86524322-ebf3-41db-a1ed-9d22c67deb6b@linux.dev>
Date: Wed, 23 Jul 2025 09:37:20 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: KaFai Wan <kafai.wan@...ux.dev>, ast@...nel.org, daniel@...earbox.net,
 john.fastabend@...il.com, andrii@...nel.org, martin.lau@...ux.dev,
 eddyz87@...il.com, song@...nel.org, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, mykolal@...com, shuah@...nel.org,
 laoar.shao@...il.com, linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 linux-kselftest@...r.kernel.org, leon.hwang@...ux.dev
Subject: Re: [PATCH bpf-next v3 2/4] bpf: Add log for attaching tracing
 programs to functions in deny list



On 7/22/25 8:34 AM, KaFai Wan wrote:
> Show the rejected function name when attaching tracing programs to
> functions in deny list.
>
> With this change, we know why tracing programs can't attach to functions
> like migrate_disable() from log.
>
> $ ./fentry
> libbpf: prog 'migrate_disable': BPF program load failed: -EINVAL
> libbpf: prog 'migrate_disable': -- BEGIN PROG LOAD LOG --
> Attaching tracing programs to function 'migrate_disable' is rejected.
>
> Suggested-by: Leon Hwang <leon.hwang@...ux.dev>
> Signed-off-by: KaFai Wan <kafai.wan@...ux.dev>

Acked-by: Yonghong Song <yonghong.song@...ux.dev>