From nobody Thu Oct 9 02:51:11 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3CCF72836B4; Fri, 20 Jun 2025 11:12:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750417940; cv=none; b=sifq8+S3veThqSMiKfnxcjoyIdmWmcq36PwUdUJ7xbgTx4UWXgOO10/osPh855Ilmu2NzNRLwd3hMETP5aF6tJbQDD89V3RD1CWX8dva2ilABrlAMkLJIXqhtO9+GV/opUosgSD9TSCnOEc7jrG5KoA5f+CrvZmtn7XklPLnrPo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750417940; c=relaxed/simple; bh=WMxIjt67lfuwqeKRpfaOj1XAiUSOcn4mzIZSrhiNk7w=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=qHBM2lQft+ML6ZPZUp7iFtF/NQuuc+SFO6wsrKBVK10ol0fEjVmcMWQqSa+1WUXdC+ARMv+qw/YmAjHWdCYJK9neTvSs6YxdO74v91AMYW1RlmKhrzjssvefEwBgdS7ok9k3EbHsEi3vGzxjKPbLuIDB8yTBbo8wvI7SnZla6cM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LjjswfEM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LjjswfEM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ADA7C4CEE3; Fri, 20 Jun 2025 11:12:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750417939; bh=WMxIjt67lfuwqeKRpfaOj1XAiUSOcn4mzIZSrhiNk7w=; h=From:To:Cc:Subject:Date:From; b=LjjswfEM6Xe5engaFwt9Sfm1HxRG/5s0+N5g7hXm6nVvVoOEw4FmuW6Njhw118/yF Y87+h3kKWBKOPkJt1bzl0oq8fRi3nWbX61Am53Yf8J+WJuAj7GccXP/2JPrsTltwIW 9fGywE1XG+4nO5bKs4UTHaAyRGcuFCJKS9SYtrW2rUv84m7zDvA9aL/EH1kDraPycx fgrGDrLmA4ptelHhUPzOCBXbrnvF/1ReyiTo2iwHaXemhvs7KXUHMLsF88/nDUF5Qs z4G7CqSTMJcofA5r2MrMSmECRWJzOWdQXQRJ2Jo3B9hIk+nOqXaHhRCEH4rRz6w8II mPHouccUcPZgg== From: Arnd Bergmann To: Steven Rostedt , Masami Hiramatsu , Song Chen Cc: Arnd Bergmann , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH] kernel: trace: preemptirq_delay_test: use offstack cpu mask Date: Fri, 20 Jun 2025 13:12:12 +0200 Message-Id: <20250620111215.3365305-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Arnd Bergmann A CPU mask on the stack is broken for large values of CONFIG_NR_CPUS: kernel/trace/preemptirq_delay_test.c: In function =E2=80=98preemptirq_delay= _run=E2=80=99: kernel/trace/preemptirq_delay_test.c:143:1: error: the frame size of 8512 b= ytes is larger than 1536 bytes [-Werror=3Dframe-larger-than=3D] Fall back to dynamic allocation here. Fixes: 4b9091e1c194 ("kernel: trace: preemptirq_delay_test: add cpu affinit= y") Signed-off-by: Arnd Bergmann --- kernel/trace/preemptirq_delay_test.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/kernel/trace/preemptirq_delay_test.c b/kernel/trace/preemptirq= _delay_test.c index 9b7037194663..331b49240180 100644 --- a/kernel/trace/preemptirq_delay_test.c +++ b/kernel/trace/preemptirq_delay_test.c @@ -117,12 +117,15 @@ static int preemptirq_delay_run(void *data) { int i; int s =3D min(burst_size, NR_TEST_FUNCS); - struct cpumask cpu_mask; + cpumask_var_t cpu_mask; + + if (!alloc_cpumask_var(&cpu_mask, GFP_KERNEL)) + return -ENOMEM; =20 if (cpu_affinity > -1) { - cpumask_clear(&cpu_mask); - cpumask_set_cpu(cpu_affinity, &cpu_mask); - if (set_cpus_allowed_ptr(current, &cpu_mask)) + cpumask_clear(cpu_mask); + cpumask_set_cpu(cpu_affinity, cpu_mask); + if (set_cpus_allowed_ptr(current, cpu_mask)) pr_err("cpu_affinity:%d, failed\n", cpu_affinity); } =20 @@ -139,6 +142,8 @@ static int preemptirq_delay_run(void *data) =20 __set_current_state(TASK_RUNNING); =20 + free_cpumask_var(cpu_mask); + return 0; } =20 --=20 2.39.5