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Wed, 12 Nov 2025 06:12:56 -0800 (PST) From: Paul Houssel X-Google-Original-From: Paul Houssel To: Paul Houssel , Eduard Zingerman , 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 Subject: [PATCH v2 2/2] selftests/bpf: add BTF dedup tests for recursive typedef definitions Date: Wed, 12 Nov 2025 15:11:34 +0100 Message-ID: X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add several ./test_progs tests: 1. btf/dedup:recursive typedef ensures that deduplication no longer fails on recursive typedefs. 2. btf/dedup:typedef ensures that typedefs are deduplicated correctly just as they were before this patch. Signed-off-by: Paul Houssel --- tools/testing/selftests/bpf/prog_tests/btf.c | 61 ++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/s= elftests/bpf/prog_tests/btf.c index 8a9ba4292109..a19db159475a 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf.c +++ b/tools/testing/selftests/bpf/prog_tests/btf.c @@ -7495,6 +7495,67 @@ static struct btf_dedup_test dedup_tests[] =3D { BTF_STR_SEC("\0t\0m1\0m2\0tag1\0tag2\0tag3"), }, }, +{ + .descr =3D "dedup: recursive typedef", + /* + * This test simulates a recursive typedef, which in GO is defined as suc= h: + * + * 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] */ + 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"), + }, +}, +{ + .descr =3D "dedup: typedef", + /* + * // CU 1: + * typedef int foo; + * + * // CU 2: + * typedef int foo; + */ + .input =3D { + .raw_types =3D { + /* CU 1 */ + BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + BTF_TYPEDEF_ENC(NAME_NTH(1), 1), /* [2] */ + /* CU 2 */ + BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [3] */ + BTF_TYPEDEF_ENC(NAME_NTH(1), 3), /* [4] */ + BTF_END_RAW, + }, + BTF_STR_SEC("\0foo"), + }, + .expect =3D { + .raw_types =3D { + BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + BTF_TYPEDEF_ENC(NAME_NTH(1), 1), /* [2] */ + BTF_END_RAW, + }, + BTF_STR_SEC("\0foo"), + }, +}, { .descr =3D "dedup: typedef tags", .input =3D { --=20 2.51.0