From: Eduard Zingerman <eddyz87@gmail.com>
To: Paul Houssel <paulhoussel2@gmail.com>,
bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Martin Horth <martin.horth@telecom-sudparis.eu>,
Ouail Derghal <ouail.derghal@imt-atlantique.fr>,
Guilhem Jazeron <guilhem.jazeron@inria.fr>,
Ludovic Paillat <ludovic.paillat@inria.fr>,
Robin Theveniaut <robin.theveniaut@irit.fr>,
Tristan d'Audibert <tristan.daudibert@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>,
Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
Shuah Khan <shuah@kernel.org>,
Paul Houssel <paul.houssel@orange.com>
Subject: Re: [PATCH v4 1/2] libbpf: fix BTF dedup to support recursive typedef definitions
Date: Thu, 13 Nov 2025 11:21:09 -0800 [thread overview]
Message-ID: <351b27a15b9222a48f720de17093ab24d14ec391.camel@gmail.com> (raw)
In-Reply-To: <bf00857b1e06f282aac12f6834de7396a7547ba6.1763037045.git.paul.houssel@orange.com>
On Thu, 2025-11-13 at 13:39 +0100, Paul Houssel wrote:
> Handle recursive typedefs in BTF deduplication
>
> Pahole fails to encode BTF for some Go projects (e.g. Kubernetes and
> Podman) due to recursive type definitions that create reference loops
> not representable in C. These recursive typedefs trigger a failure in
> the BTF deduplication algorithm.
>
> This patch extends btf_dedup_ref_type() to properly handle potential
> recursion for BTF_KIND_TYPEDEF, similar to how recursion is already
> handled for BTF_KIND_STRUCT. This allows pahole to successfully
> generate BTF for Go binaries using recursive types without impacting
> existing C-based workflows.
>
> Co-developed-by: Martin Horth <martin.horth@telecom-sudparis.eu>
> Signed-off-by: Martin Horth <martin.horth@telecom-sudparis.eu>
> Co-developed-by: Ouail Derghal <ouail.derghal@imt-atlantique.fr>
> Signed-off-by: Ouail Derghal <ouail.derghal@imt-atlantique.fr>
> Co-developed-by: Guilhem Jazeron <guilhem.jazeron@inria.fr>
> Signed-off-by: Guilhem Jazeron <guilhem.jazeron@inria.fr>
> Co-developed-by: Ludovic Paillat <ludovic.paillat@inria.fr>
> Signed-off-by: Ludovic Paillat <ludovic.paillat@inria.fr>
> Co-developed-by: Robin Theveniaut <robin.theveniaut@irit.fr>
> Signed-off-by: Robin Theveniaut <robin.theveniaut@irit.fr>
> Suggested-by: Tristan d'Audibert <tristan.daudibert@gmail.com>
> Signed-off-by: Paul Houssel <paul.houssel@orange.com>
>
> ---
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
[...]
next prev parent reply other threads:[~2025-11-13 19:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-13 12:39 [PATCH v4 0/2] libbpf: fix BTF dedup to support recursive typedef Paul Houssel
2025-11-13 12:39 ` [PATCH v4 1/2] libbpf: fix BTF dedup to support recursive typedef definitions Paul Houssel
2025-11-13 19:21 ` Eduard Zingerman [this message]
2025-11-13 12:39 ` [PATCH v4 2/2] selftests/bpf: add BTF dedup tests for " Paul Houssel
2025-11-13 19:21 ` Eduard Zingerman
2025-11-15 1:30 ` [PATCH v4 0/2] libbpf: fix BTF dedup to support recursive typedef patchwork-bot+netdevbpf
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