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([2620:10d:c090:500::6:aa7e]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-bc208695cf1sm1091377a12.7.2025.11.12.12.28.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Nov 2025 12:28:44 -0800 (PST) Message-ID: Subject: Re: [PATCH v2 2/2] selftests/bpf: add BTF dedup tests for 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: Wed, 12 Nov 2025 12:28:41 -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-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-11-12 at 15:11 +0100, Paul Houssel wrote: Lgtm, one nit below: > +{ > + .descr =3D "dedup: recursive typedef", > + /* > + * This test simulates a recursive typedef, which in GO is defined as s= uch: > + * > + * type Foo func() Foo > + * > + * In BTF terms, this is represented as a TYPEDEF referencing > + * a FUNC_PROTO that returns the same TYPEDEF. > + */ > + .input =3D { > + .raw_types =3D { > + /* > + * [1] typedef Foo -> func() Foo > + * [2] func_proto() -> Foo > + */ > + BTF_TYPEDEF_ENC(NAME_NTH(1), 2), /* [1] */ > + BTF_FUNC_PROTO_ENC(1, 0), /* [2] */ Nit: Maybe repeat the above two types, just to make sure that deduplication happ= ens? > + BTF_END_RAW, > + }, > + BTF_STR_SEC("\0Foo"), > + }, > + .expect =3D { > + .raw_types =3D { > + BTF_TYPEDEF_ENC(NAME_NTH(1), 2), /* [1] */ > + BTF_FUNC_PROTO_ENC(1, 0), /* [2] */ > + BTF_END_RAW, > + }, > + BTF_STR_SEC("\0Foo"), > + }, > +}, [...]