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Thu, 13 Nov 2025 11:21:12 -0800 (PST) Message-ID: <351b27a15b9222a48f720de17093ab24d14ec391.camel@gmail.com> Subject: Re: [PATCH v4 1/2] libbpf: fix BTF dedup to support recursive typedef definitions From: Eduard Zingerman To: Paul Houssel , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Martin Horth , Ouail Derghal , Guilhem Jazeron , Ludovic Paillat , Robin Theveniaut , Tristan d'Audibert , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Paul Houssel Date: Thu, 13 Nov 2025 11:21:09 -0800 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-11-13 at 13:39 +0100, Paul Houssel wrote: > Handle recursive typedefs in BTF deduplication >=20 > 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. >=20 > 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. >=20 > Co-developed-by: Martin Horth > Signed-off-by: Martin Horth > Co-developed-by: Ouail Derghal > Signed-off-by: Ouail Derghal > Co-developed-by: Guilhem Jazeron > Signed-off-by: Guilhem Jazeron > Co-developed-by: Ludovic Paillat > Signed-off-by: Ludovic Paillat > Co-developed-by: Robin Theveniaut > Signed-off-by: Robin Theveniaut > Suggested-by: Tristan d'Audibert > Signed-off-by: Paul Houssel >=20 > --- Acked-by: Eduard Zingerman [...]