From: Quentin Monnet <qmo@kernel.org>
To: "Thiébaud Weksteen" <tweek@google.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Kumar Kartikeya Dwivedi" <memxor@gmail.com>,
"Shuah Khan" <shuah@kernel.org>, "KP Singh" <kpsingh@kernel.org>,
"Leon Hwang" <leon.hwang@linux.dev>,
"Emil Tsalapatis" <emil@etsalapatis.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
Jiri Olsa <jolsa@kernel.org>,
Ihor Solodrai <ihor.solodrai@linux.dev>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH bpf-next v2 2/3] bpftool: Compute light skeleton ctx.sz without relying on links
Date: Thu, 17 Sep 2026 13:03:48 +0100 [thread overview]
Message-ID: <27db90ca-dd4f-48a5-896c-cf0b1052101a@kernel.org> (raw)
In-Reply-To: <20260909042433.1775591-2-tweek@google.com>
On 09/09/2026 05:24, Thiébaud Weksteen wrote:
> When generating a light skeleton, gen_trace() unconditionally sets
> skel->ctx.sz using (char *)&skel->links - (char *)skel. However, if a
> BPF object has no programs and no struct_ops maps (prog_cnt +
> attach_map_cnt == 0), do_skeleton() omits the links struct, causing the
> generated skeleton header to fail compilation.
>
> Compute skel->ctx.sz from the end of progs (if prog_cnt > 0), maps (if
> map_cnt > 0), or ctx instead of relying on skel->links. Also remove the
> unused opts.data_sz argument passed to codegen().
>
> Fixes: d510296d331a ("bpftool: Use syscall/loader program in "prog load" and "gen skeleton" command.")
> Signed-off-by: Thiébaud Weksteen <tweek@google.com>
Acked-by: Quentin Monnet <qmo@kernel.org>
Thank you
next prev parent reply other threads:[~2026-09-17 12:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-09 4:24 [PATCH bpf-next v2 1/3] bpftool: Skip non-autoload programs when generating light skeletons Thiébaud Weksteen
2026-09-09 4:24 ` [PATCH bpf-next v2 2/3] bpftool: Compute light skeleton ctx.sz without relying on links Thiébaud Weksteen
2026-09-17 12:03 ` Quentin Monnet [this message]
2026-09-09 4:24 ` [PATCH bpf-next v2 3/3] selftests/bpf: Verify program FD after non-autoload programs in lskel Thiébaud Weksteen
2026-09-10 5:49 ` Leon Hwang
2026-09-17 1:06 ` Thiébaud Weksteen
2026-09-17 12:04 ` Quentin Monnet
2026-09-09 5:02 ` [PATCH bpf-next v2 1/3] bpftool: Skip non-autoload programs when generating light skeletons bot+bpf-ci
2026-09-17 12:03 ` Quentin Monnet
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