From nobody Mon Oct 6 08:04:02 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 0D7081F3B8A for ; Wed, 23 Jul 2025 15:36:02 +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=1753284963; cv=none; b=TIayObE0Q836HnYrrEcUDNXxNYOZoOS8rn/1Dkhecb7PI2yMELKLJx1Ox6R3logPXmObl51/sGLibI8RzkX46+aawGyTNCJuIPKI5SHOCfSHPYkOnZyZEaB8vcjMZyupodCC2fUPj9DEtDNYYJsuBguxWq7fxpquClE9h8CF7oA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753284963; c=relaxed/simple; bh=ZvXKGt+TTpbDKDr6EJ7fxN2C5u+9aqZGHrvGXXcGovU=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=kLbysPK5sIRgFwTJphaLgFPYxc6JzzD0yx/zh2pTUTqrBnCWYFTH1dR4AuJB3PhNuPt3ZVvazf8TbReCpbJimRXxKyPP/Vzk4XnqoBWja5CSioD5CXMhXTxe7oft59XncWPx4vnHYrFHctOdlFyhj/JG+MWJ8ONsP+uEdTVcqWM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZlzQh9sz; 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="ZlzQh9sz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A7411C4CEF7; Wed, 23 Jul 2025 15:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753284962; bh=ZvXKGt+TTpbDKDr6EJ7fxN2C5u+9aqZGHrvGXXcGovU=; h=Date:From:To:Cc:Subject:References:From; b=ZlzQh9szu7jpVc+b9G9eMGPueaBi7QbXpil2Zo+swjRepswBtAL9KCvXjwXmdPmq/ 1lXhMXH8160hDebPOL1/ncv32lPt4EQidaSAE1osq0gr84rAiTW3Ig/YHAQiiBDEt/ 2FsGbpjgFoJ6Z/ThB/XLjuL1A4hzWA7Gy5BjQgz6+zPvJuhOAVOPguruacoJonu6Z/ e6byPyAw+Ueyb6wlX9sVpMdAyx8RNwRijaUpqzgoNFbT423Dr+nahManpKyA0fEjSY tLlqN+1G5ua31Yb5qyhBSzQuxAfPo/XXTeYbr9uo3V4k1BtKXWPIz1n3UhumbOzq5g sLil8w080iDIA== Received: from rostedt by gandalf with local (Exim 4.98.2) (envelope-from ) id 1ueamd-00000000LQE-47iM; Wed, 23 Jul 2025 10:49:27 -0400 Message-ID: <20250723144927.839559500@kernel.org> User-Agent: quilt/0.68 Date: Wed, 23 Jul 2025 10:49:10 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Song Chen , Arnd Bergmann Subject: [for-next][PATCH 3/8] kernel: trace: preemptirq_delay_test: use offstack cpu mask References: <20250723144907.219256132@kernel.org> 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. Cc: Masami Hiramatsu Cc: Song Chen Cc: Mathieu Desnoyers Link: https://lore.kernel.org/20250620111215.3365305-1-arnd@kernel.org Fixes: 4b9091e1c194 ("kernel: trace: preemptirq_delay_test: add cpu affinit= y") Signed-off-by: Arnd Bergmann Signed-off-by: Steven Rostedt (Google) --- 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 314ffc143039..acb0c971a408 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 2.47.2