From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AC08B2FF66B for ; Sat, 11 Jul 2026 20:36:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783802204; cv=none; b=p7QHqcJrFKvsZ9Wi6plt4hGQs+fTA2xsOf8RxpWXwhw7NXd87LHwapy4WKddILUGG30GVqEzZ6TBdeOSEr4ImvveyOWd0YD6HvvCdfW/eaHAFdMCWWFvs2moKzJ7vQi18EGPBzAJ4i7zBXEI0jZLcCEI5frB7h2kJaFxa3voDZs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783802204; c=relaxed/simple; bh=2dgTfI/XJodV0qrch/DBF4/9UUIJ0kWIW04OEz8+46Y=; h=From:Date:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=DFHdpVL8450XXiCjpi7vZyPF9QrkS36Zs94fP1IlEyOH5AsxsrZXWW0MY2T7WwVMuwKuh50QKNYsNL20XjhTCtjTgwdwI9sNJw+Az0Jrp/QqOwi5GhAj5OVTdVLWW8zmtdALuZwiz9+wlM60LpFzXunQzFPg0ubkhoTuUsfHf9Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=BAfYSKKH; arc=none smtp.client-ip=209.85.128.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="BAfYSKKH" Received: by mail-wm1-f49.google.com with SMTP id 5b1f17b1804b1-493f431e317so18524845e9.0 for ; Sat, 11 Jul 2026 13:36:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1783802201; x=1784407001; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:date:from:from:to:cc:subject :date:message-id:reply-to:content-type; bh=YLlcSGdxTmLHCyux2hhQn4ZHpYp2OmIxTmU5fTrJllk=; b=BAfYSKKH2cIQvIqSs2mypDCmr5OKLkQn7O5rsfqJl5VmBLFGbOgcimrHuj/ZotbQCD SZD/Sovf5O1IcwaLanAmnH7HCEHNBL5GxXEgIDJS38wMp9f71nGpswNhwee+J60h1yc8 k/R96ZPv7PTPJoDXYerrQUyALWeTaLXHXgz9r7QHphjW0cPQtTM+CRFkzE5BqOAXzSMl YkTjmzFwoJlgjk25oto2DJkUnci3bpH379830kzICnx7cS7A/ha1ZWC1jHO/0Yv+huQQ jPHr89/3qhvEbLxdlbhIP3UXVTN9bOtnJ2YwfuIYSdQhLmHEJ+blh7z68e01UKzJ3XUV nRFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783802201; x=1784407001; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=YLlcSGdxTmLHCyux2hhQn4ZHpYp2OmIxTmU5fTrJllk=; b=bsPG8oZ1YIHoTXNtFWwgBXxZnz9DZEXepFCNFhbnB3xTpoLJZ2NBX+DASQdUsex80/ R8NONE6ysGPEXSJhraJ0GmANBCRN8LaIyWqHh1KwrRAxF4EdQgaK+qRyDgfS4wsI/o/p 3AOE0ngVIoa0FS6wT439+a9Bzr5Wqd85wu+JC/2sxrhzYsneLZ24LzH5KTwsWEYp79MP 4tjuyqnqobk5GYIhNgEaLsQx3Epnpp59OKI5qCcoUrVVjzs6RTCqSoARybKlPVkYLuIA Wm7kqlfLq/UXHGOIes+7Lr4gg2KgZ6zghc3Wf31LdPBbpsSQgQ9K7BUTTW+VasIOLWDE JqAg== X-Forwarded-Encrypted: i=1; AHgh+RrVn1oTBTwW1zsDa5Y5wdh13qmenuFN2GvgbkO6bErf0dltR3dW+N93VOnZzTfqa4mVYtxW8h+eIz1sqd4REiw=@vger.kernel.org X-Gm-Message-State: AOJu0YyXXj244qgu40a8P//UELqUhdnszWxQuP1v0OZy67uZpU7wzNal 0n9K+iHV4AR5v/H1aSpbLX74M0ME89TwOesUxBSy4fpRz8HQsBBniqzk X-Gm-Gg: AfdE7clHR/8d6+pUhI7gvEeEEb1tOSC4y7R0HRQeHhdf7fnI6uyL45+8exSVfo5WrvE bw1auWBSs5xICHcCe14i0Cbtmx/bbs3oPrPUZ4XYG9DdO1XMok1OyCekp/oSxSuTx7Phe4ieN0t nLK3u+aU6al6ZBEmMyrzy87bFElRkctsA3X0dnbs8mtfX+I3pMzWpe4AgEEqDjmlmi0ZZRAVfQw 8ZVFFV/FONjYKx5wabqScnxgMZizQ/6WWIHt4m1BkYrddMxJxvlRmzDreMSg8s0tD+tWPIy/EZP kfuh2DN5rjj7Wu/RxPPW+lKgw+JcFIr8NFQqDvGUtxI+d1zGok1OKPa31RUk35QEXg1/a3zwtly TK5OobLlohx8Pz6LYapPsi+D/zit0ji1J3bzujtmeKdHm5flg+0kr4dtsTuIlPO6mP/1G+k72Af YMrgvq4qRlVPA= X-Received: by 2002:a05:600c:46c7:b0:493:bc92:ba9a with SMTP id 5b1f17b1804b1-493f87e4983mr39479415e9.13.1783802200892; Sat, 11 Jul 2026 13:36:40 -0700 (PDT) Received: from krava ([176.74.159.170]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493eb6ccaf1sm418501875e9.2.2026.07.11.13.36.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jul 2026 13:36:40 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Sat, 11 Jul 2026 22:36:38 +0200 To: Leon Hwang Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Emil Tsalapatis , Shuah Khan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-patches-bot@fb.com Subject: Re: [PATCH bpf-next v2 2/2] selftests/bpf: Test fentry link after tracing_multi link Message-ID: References: <20260711124822.29406-1-leon.hwang@linux.dev> <20260711124822.29406-3-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260711124822.29406-3-leon.hwang@linux.dev> On Sat, Jul 11, 2026 at 08:48:22PM +0800, Leon Hwang wrote: > Verify that there's no any issue to attach tracing_multi link, then attach > fentry link. > > Assisted-by: Codex:gpt-5.6-sol > Signed-off-by: Leon Hwang Acked-by: Jiri Olsa thanks, jirka > --- > .../selftests/bpf/prog_tests/tracing_multi.c | 69 +++++++++++++++++++ > .../progs/tracing_multi_intersect_attach.c | 8 +++ > 2 files changed, 77 insertions(+) > > diff --git a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c > index f02ffc7f41d7..0aa9532a05cf 100644 > --- a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c > +++ b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c > @@ -460,6 +460,73 @@ static void test_intersect(void) > tracing_multi_intersect__destroy(skel); > } > > +static void test_fentry_after_multi(void) > +{ > + static const char * const funcs[] = { > + "bpf_fentry_test1", > + }; > + struct bpf_link *fentry_link = NULL, *multi_link = NULL; > + struct tracing_multi_intersect *skel = NULL; > + LIBBPF_OPTS(bpf_tracing_multi_opts, opts); > + LIBBPF_OPTS(bpf_test_run_opts, topts); > + __u32 *ids = NULL; > + int err; > + > + skel = tracing_multi_intersect__open_and_load(); > + if (!ASSERT_OK_PTR(skel, "tracing_multi_intersect__open_and_load")) > + return; > + > + skel->bss->pid = getpid(); > + > + ids = get_ids(funcs, ARRAY_SIZE(funcs), NULL); > + if (!ASSERT_OK_PTR(ids, "get_ids")) > + goto cleanup; > + > + opts.ids = ids; > + opts.cnt = ARRAY_SIZE(funcs); > + multi_link = bpf_program__attach_tracing_multi(skel->progs.fentry_1, NULL, &opts); > + if (!ASSERT_OK_PTR(multi_link, "attach_multi")) > + goto cleanup; > + > + fentry_link = bpf_program__attach(skel->progs.fentry); > + if (!ASSERT_OK_PTR(fentry_link, "attach_fentry")) > + goto cleanup; > + > + err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.fentry_1), &topts); > + if (!ASSERT_OK(err, "test_run")) > + goto cleanup; > + ASSERT_EQ(skel->bss->test_result_fentry_1, 1, "multi_fentry"); > + ASSERT_EQ(skel->bss->test_result_fentry, 1, "fentry"); > + > + err = bpf_link__destroy(fentry_link); > + fentry_link = NULL; > + if (!ASSERT_OK(err, "destroy_fentry")) > + goto cleanup; > + > + err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.fentry_1), &topts); > + if (!ASSERT_OK(err, "test_run_multi")) > + goto cleanup; > + ASSERT_EQ(skel->bss->test_result_fentry_1, 2, "multi_fentry_only"); > + ASSERT_EQ(skel->bss->test_result_fentry, 1, "fentry_detached"); > + > + err = bpf_link__destroy(multi_link); > + multi_link = NULL; > + if (!ASSERT_OK(err, "destroy_multi")) > + goto cleanup; > + > + err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.fentry_1), &topts); > + if (!ASSERT_OK(err, "test_run_detached")) > + goto cleanup; > + ASSERT_EQ(skel->bss->test_result_fentry_1, 2, "multi_fentry_detached"); > + ASSERT_EQ(skel->bss->test_result_fentry, 1, "fentry_still_detached"); > + > +cleanup: > + bpf_link__destroy(fentry_link); > + bpf_link__destroy(multi_link); > + free(ids); > + tracing_multi_intersect__destroy(skel); > +} > + > static void test_session(void) > { > LIBBPF_OPTS(bpf_test_run_opts, topts); > @@ -957,4 +1024,6 @@ void test_tracing_multi_test(void) > if (test__start_subtest("attach_api_fails")) > test_attach_api_fails(); > RUN_TESTS(tracing_multi_verifier); > + if (test__start_subtest("fentry_after_multi")) > + test_fentry_after_multi(); > } > diff --git a/tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c b/tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c > index cd5be0bb6ffd..5b0af8f4c62f 100644 > --- a/tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c > +++ b/tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c > @@ -11,6 +11,14 @@ __u64 test_result_fentry_1 = 0; > __u64 test_result_fentry_2 = 0; > __u64 test_result_fexit_1 = 0; > __u64 test_result_fexit_2 = 0; > +__u64 test_result_fentry = 0; > + > +SEC("fentry/bpf_fentry_test1") > +int BPF_PROG(fentry) > +{ > + tracing_multi_arg_check(ctx, &test_result_fentry, false); > + return 0; > +} > > SEC("fentry.multi") > int BPF_PROG(fentry_1) > -- > 2.55.0 >