From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f178.google.com (mail-yw1-f178.google.com [209.85.128.178]) (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 9AD8E221277 for ; Sun, 15 Mar 2026 05:42:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773553361; cv=none; b=kKCZQZqnzNf+cxWJtTfD6tP4Vbecks/AhyNg8GDbAUaC+Dtj5LAFW7WxReY/0ROL64FJDctSMfbFPt8VoUIE+X+NLgjs4gD4lDlxXDJx8U5+B8rNffbKI6Kix+SsrBo0kf3e5o0qqV8KSzaKeUe9Ln3qQkaj9u9TN1ewy1/D/7g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773553361; c=relaxed/simple; bh=kR+TE10tpnxKQiZjkq/fLqmkxPaUA58D/ODHc+W7kf4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=HnGEEjPp4GmHajd/fG2Lj6qF/6/Vt7n6TANd5hd0RU9xsRrOdI+9hiYBKFzKF4YMdPQRzrRrq8IflL/ssWQdYo8J0bNmYFr/BdFK+5DAPRkE6McAGVFkXBg5hX0te0oLtdW7XtpN4fnBnlgwNvd53iAOylwb9AMDeBm10+sXMrE= 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=QxzjXvfY; arc=none smtp.client-ip=209.85.128.178 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="QxzjXvfY" Received: by mail-yw1-f178.google.com with SMTP id 00721157ae682-79a46260385so712377b3.3 for ; Sat, 14 Mar 2026 22:42:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1773553360; x=1774158160; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=dKUquyCRSPWmlofe+X/2wplVAFLMW1S/AyCAW60GwsI=; b=QxzjXvfYU6OMptXMDMRGMyLBoyPTMqkwlcBgBZ/0Tbd4xPYbd54b0UmWkfvsFbZNW2 1MNVtJHD0MkCNfKz1ShSmvNOfZjRzYwZDKKUmLK3imACdL51laDHFRVbd8panc0sM3i1 NAdeulCOcJbzHkWUeul54aBh0PZR1Bav5KSv/aZMj7dUPH5nhRCw6QuITXtoyCaO9WQX DOJLY3w8b6TbuYWVGQ3t+74OJyb2rHMhupw1KWPDkMQZFKrkWXyAKHvETRktgoldo+LL JJkpseoAbC2MDPxatyzIRzV7/OMxu/tD+qzA7c8aj+gM0vFBHdMfhmWSfLkEnQjTZJmW XpvA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773553360; x=1774158160; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=dKUquyCRSPWmlofe+X/2wplVAFLMW1S/AyCAW60GwsI=; b=JCQ/9FThvI2Ybva2jsZgiGQA3FfwQrl59hiSIw5ElWSVOLeQsJ1gmoKip34KI0HTNq fuLXd0Wf/LZR49qzYXiE9jfaU5lmXDMfOvU9srTzGu38KyRH3lKGaOItVJZEQPmB/CXj M8ULLrsrNVv6cTWgXTIu9B5e8NYPw3A7+i/MUVDdH7WBO2Mm+6H28RWuZ1x9KZNw2TIc lpV1IHo7vhmo6JySx6YNhIIaYRLdN4hNXJhc6/0Pbzeet3BUeZnPCOxu5AjnviHuCRkg CPszCAVw3afYFpzB1uMPH/KL0q4RJVSWPqXl830JV2lZQmUB9qrFX7/U4ZwZLY7plI8u b3fQ== X-Forwarded-Encrypted: i=1; AJvYcCVGDbSNodvIHIj3+MDgiTIz8su99MGmTKaBXjeoljY8x6nkVzO+RldFx2KWmy9+6/r1KkPlxMnE4ZyEMhuLlG0=@vger.kernel.org X-Gm-Message-State: AOJu0Yy8kP1OGHR98QdyQXdMPSEk9e2qIjBs7wKuJpKnlswYEuJ5kwS3 8x31uocpKy27QUnfNrhIlbAt67bh4fSLnpz8rmb0EBg4TxX8NA8zkb7h X-Gm-Gg: ATEYQzytvQpclHvp8ZZbkchAdKiATT8OZRlM6AnivKrDE2PYNQMK6oeXKctPDRYMTMp Rz3jLP4u9wwNPNEuw6z1Juofh3yzNNQP5HMUADSuXf5WgroLrOvkuqZRr9jVNKW+J3lWRzTNWSa 0+hWbU/i2/sUxpXqXaeDiMWm5DEniN7XNgNQan5pAIosLL3loNZYGTHrgf/b7axXN+L0rN3jRji KUYfRtb47FPCoWCaX5z6mYvWs8YCgRignSY6pwJeuHZ5rTgLjloVbEb74Oy5qhFsGgqUyUaEddD jIPn74D9ePlZ+aSS3iTJ2UOQjVxb7oQEw+6/kj+weff2UkZHrhufXo3l7TbTCXXm7AOBDg7AYlN OG+X9FdEzWc1fTaCDJq27aZaIRhr6z6Wgv/WUkkRBn573/Ed49YcI99otpz5nek3F73R71N6+iN bHXVjao/CslrrWbiEuamseKKkaCKdsGOiSSl1RLWLctl91ovQu+iDmTKvZX8K8tm/EZoNPTzMHw KrKakVNo1e1s3Vxusipq9d4G9Y= X-Received: by 2002:a05:690c:306:b0:794:9d24:76b0 with SMTP id 00721157ae682-79a1c1ea9a9mr86872447b3.54.1773553359688; Sat, 14 Mar 2026 22:42:39 -0700 (PDT) Received: from localhost.localdomain (108-214-96-168.lightspeed.sntcca.sbcglobal.net. [108.214.96.168]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7991a7041f3sm67562517b3.14.2026.03.14.22.42.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Mar 2026 22:42:39 -0700 (PDT) From: Sun Jian To: andrii@kernel.org, eddyz87@gmail.com, shuah@kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Sun Jian Subject: [PATCH] selftests/bpf: trampoline_count: use dedicated target function Date: Sun, 15 Mar 2026 13:42:27 +0800 Message-ID: <20260315054227.118344-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit trampoline_count fills all trampoline attachment slots for a single target function and verifies that one extra attach fails with -E2BIG. It currently targets bpf_modify_return_test, which is also used by modify_return and get_func_ip_test. When those tests run in parallel, they can contend for the same per-function trampoline quota and cause unexpected attach failures. This issue is currently masked by harness serialization. Add a dedicated bpf_trampoline_count_test target and switch trampoline_count to use it. This keeps the test semantics unchanged while isolating it from other modify_return-based selftests, so it no longer needs to run in serial mode. Remove the TODO comment as well. Tested: ./test_progs -t trampoline_count -vv ./test_progs -t modify_return -vv ./test_progs -t get_func_ip_test -vv ./test_progs -j$(nproc) -t trampoline_count -vv ./test_progs -j$(nproc) -t trampoline_count,modify_return,get_func_ip_test -vv Signed-off-by: Sun Jian --- net/bpf/test_run.c | 7 +++++++ tools/testing/selftests/bpf/prog_tests/trampoline_count.c | 3 +-- tools/testing/selftests/bpf/progs/test_trampoline_count.c | 6 +++--- 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index 178c4738e63b..b41147a29f16 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -580,6 +580,12 @@ __bpf_kfunc int bpf_modify_return_test2(int a, int *b, short c, int d, return a + *b + c + d + (long)e + f + g; } +__bpf_kfunc int bpf_trampoline_count_test(int a, int *b) +{ + *b += 1; + return a + *b; +} + __bpf_kfunc int bpf_modify_return_test_tp(int nonce) { trace_bpf_trigger_tp(nonce); @@ -635,6 +641,7 @@ BTF_KFUNCS_START(bpf_test_modify_return_ids) BTF_ID_FLAGS(func, bpf_modify_return_test) BTF_ID_FLAGS(func, bpf_modify_return_test2) BTF_ID_FLAGS(func, bpf_modify_return_test_tp) +BTF_ID_FLAGS(func, bpf_trampoline_count_test) BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE) BTF_KFUNCS_END(bpf_test_modify_return_ids) diff --git a/tools/testing/selftests/bpf/prog_tests/trampoline_count.c b/tools/testing/selftests/bpf/prog_tests/trampoline_count.c index 6cd7349d4a2b..b19358aed126 100644 --- a/tools/testing/selftests/bpf/prog_tests/trampoline_count.c +++ b/tools/testing/selftests/bpf/prog_tests/trampoline_count.c @@ -30,8 +30,7 @@ static struct bpf_program *load_prog(char *file, char *name, struct inst *inst) return prog; } -/* TODO: use different target function to run in concurrent mode */ -void serial_test_trampoline_count(void) +void test_trampoline_count(void) { char *file = "test_trampoline_count.bpf.o"; char *const progs[] = { "fentry_test", "fmod_ret_test", "fexit_test" }; diff --git a/tools/testing/selftests/bpf/progs/test_trampoline_count.c b/tools/testing/selftests/bpf/progs/test_trampoline_count.c index 7765720da7d5..911d282fd423 100644 --- a/tools/testing/selftests/bpf/progs/test_trampoline_count.c +++ b/tools/testing/selftests/bpf/progs/test_trampoline_count.c @@ -3,19 +3,19 @@ #include #include -SEC("fentry/bpf_modify_return_test") +SEC("fentry/bpf_trampoline_count_test") int BPF_PROG(fentry_test, int a, int *b) { return 0; } -SEC("fmod_ret/bpf_modify_return_test") +SEC("fmod_ret/bpf_trampoline_count_test") int BPF_PROG(fmod_ret_test, int a, int *b, int ret) { return 0; } -SEC("fexit/bpf_modify_return_test") +SEC("fexit/bpf_trampoline_count_test") int BPF_PROG(fexit_test, int a, int *b, int ret) { return 0; base-commit: 267594792a71018788af69e836c52e34bb8054af -- 2.43.0