linux-kernel - Re: [PATCH bpf-next v7 2/9] libbpf: Add support for extended bpf syscall

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Message-ID: <a0ce1dab-7d7e-4b04-a033-4f0611090d34@linux.dev>
Date: Fri, 23 Jan 2026 12:06:45 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 John Fastabend <john.fastabend@...il.com>,
 Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>,
 Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>,
 KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
 Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
 Shuah Khan <shuah@...nel.org>, Christian Brauner <brauner@...nel.org>,
 Seth Forshee <sforshee@...nel.org>, Yuichiro Tsuji <yuichtsu@...zon.com>,
 Andrey Albershteyn <aalbersh@...hat.com>,
 Willem de Bruijn <willemb@...gle.com>, Jason Xing
 <kerneljasonxing@...il.com>, Tao Chen <chen.dylane@...ux.dev>,
 Mykyta Yatsenko <yatsenko@...a.com>,
 Kumar Kartikeya Dwivedi <memxor@...il.com>,
 Anton Protopopov <a.s.protopopov@...il.com>, Amery Hung
 <ameryhung@...il.com>, Rong Tao <rongtao@...tc.cn>,
 LKML <linux-kernel@...r.kernel.org>, Linux API <linux-api@...r.kernel.org>,
 "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>,
 kernel-patches-bot@...com
Subject: Re: [PATCH bpf-next v7 2/9] libbpf: Add support for extended bpf
 syscall



On 23/1/26 11:55, Alexei Starovoitov wrote:
> On Thu, Jan 22, 2026 at 7:25 PM Leon Hwang <leon.hwang@...ux.dev> wrote:
>>
>>
>> +static int probe_bpf_syscall_common_attrs(int token_fd)
>> +{
>> +       int ret;
>> +
>> +       ret = probe_sys_bpf_ext();
>> +       return ret > 0;
>> +}
> 
> When you look at the above, what thoughts come to mind?
> 
> ... and please don't use ai for answers.

My initial thought was whether probe_fd() is needed here to handle and
close a returned fd, since the return value of probe_sys_bpf_ext() isn’t
obvious from the call site.

Thanks,
Leon