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([2620:10d:c090:500::6:c5ba]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1416ac3d1bfsm19054586c88.0.2026.08.20.17.10.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Aug 2026 17:10:07 -0700 (PDT) Message-ID: <67d62b1943b093ac1eb16c9cc1ff38e0d5eda72b.camel@gmail.com> Subject: Re: [RFC PATCH bpf-next v3 2/2] selftests/bpf: add tests for selective kmod BTF loading From: Eduard Zingerman To: Fuyu Zhao , bpf@vger.kernel.org, andrii.nakryiko@gmail.com, alan.maguire@oracle.com Cc: andrii@kernel.org, ast@kernel.org, daniel@iogearbox.net, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, shuah@kernel.org, yatsenko@meta.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Date: Thu, 20 Aug 2026 17:10:05 -0700 In-Reply-To: <20260819090426.267-3-zhaofuyu@vivo.com> References: <20260819090426.267-1-zhaofuyu@vivo.com> <20260819090426.267-3-zhaofuyu@vivo.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-1.fc44) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-08-19 at 17:04 +0800, Fuyu Zhao wrote: ... > +++ b/tools/testing/selftests/bpf/prog_tests/kmod_btfs.c > @@ -0,0 +1,196 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#include > +#include "kmod_btfs.skel.h" > + > +static bool btf_skipped; > +static bool dup_ignored; > + > +static const char btf_skip_fmt[] =3D > + "libbpf: skipping module BTF '%s', not in kmod_btf_names\n"; > +static const char dup_ignore_fmt[] =3D > + "libbpf: duplicate kmod BTF name '%s' ignored\n"; > + > +static int libbpf_print_cb(enum libbpf_print_level level, const char *fm= t, > + va_list args) > +{ > + if (!strcmp(fmt, btf_skip_fmt)) { > + if (!strcmp(va_arg(args, char *), "bpf_test_no_cfi")) > + btf_skipped =3D true; > + } else if (!strcmp(fmt, dup_ignore_fmt)) { > + if (!strcmp(va_arg(args, char *), "bpf_testmod")) > + dup_ignored =3D true; > + } > + > + return 0; > +} Idk what Andrii would say about this, but I'd rather add an internal function akin to: size_t bpf_object_btf_module_cnt(const struct bpf_object *obj); in libbpf.c and expose it via libbpf_internal.h (*not* via API), instead of intercepting log messages. ...