From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60B83C4363A for ; Fri, 30 Oct 2020 13:28:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F210020702 for ; Fri, 30 Oct 2020 13:28:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726633AbgJ3N2u (ORCPT ); Fri, 30 Oct 2020 09:28:50 -0400 Received: from mga05.intel.com ([192.55.52.43]:56233 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726458AbgJ3N2t (ORCPT ); Fri, 30 Oct 2020 09:28:49 -0400 IronPort-SDR: ga4WjFHUjh7IwMRXUBjM1E14AZxx/xfqM4oSjXx8X779U4Vo6bHpkcDJMBHhAsNiMPzhOp/HSL O9UuYDmgY5sQ== X-IronPort-AV: E=McAfee;i="6000,8403,9789"; a="253313046" X-IronPort-AV: E=Sophos;i="5.77,433,1596524400"; d="scan'208";a="253313046" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Oct 2020 06:28:49 -0700 IronPort-SDR: d2vczdT8qt0jfMqhqbMv0zVLWQV95IAonDqS5Xd0n1QDDz0vD/czgebU3kb4llfSyyl104I3Ve 0rqvpTmhVm8g== X-IronPort-AV: E=Sophos;i="5.77,433,1596524400"; d="scan'208";a="537065891" Received: from lshi-mobl1.ccr.corp.intel.com (HELO [10.249.168.224]) ([10.249.168.224]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Oct 2020 06:28:46 -0700 Subject: Re: [kbuild-all] Re: drivers/video/backlight/ltv350qv.c:192:12: warning: stack frame size of 13472 bytes in function 'ltv350qv_power' To: Andrey Konovalov , Andrew Morton , kernel test robot Cc: kbuild-all@lists.01.org, clang-built-linux , LKML , Linux Memory Management List , Arnd Bergmann References: <202010260230.VivTG0Gb-lkp@intel.com> <20201025121708.04d4070a44e28146baf9a6a7@linux-foundation.org> From: "Chen, Rong A" Message-ID: <650988cc-2f70-d03a-b456-bf1915b64836@intel.com> Date: Fri, 30 Oct 2020 21:28:43 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/29/2020 11:28 PM, Andrey Konovalov wrote: > On Sun, Oct 25, 2020 at 8:17 PM Andrew Morton wrote: >> >> On Mon, 26 Oct 2020 02:15:37 +0800 kernel test robot wrote: >> >>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master >>> head: d76913908102044f14381df865bb74df17a538cb >>> commit: cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4 kasan: allow enabling stack tagging for tag-based mode >>> date: 3 months ago >>> config: arm64-randconfig-r005-20201026 (attached as .config) >>> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1c8371692dfe8245bc6690ff1262dcced4649d21) >>> reproduce (this is a W=1 build): >>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross >>> chmod +x ~/bin/make.cross >>> # install arm64 cross compiling tool for clang build >>> # apt-get install binutils-aarch64-linux-gnu >>> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4 >>> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git >>> git fetch --no-tags linus master >>> git checkout cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4 >>> # save the attached .config to linux build tree >>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 >>> >>> If you fix the issue, kindly add following tag as appropriate >>> Reported-by: kernel test robot >>> >>> All warnings (new ones prefixed by >>): >>> >>>>> drivers/video/backlight/ltv350qv.c:192:12: warning: stack frame size of 13472 bytes in function 'ltv350qv_power' [-Wframe-larger-than=] >> >> That's a lot of stack. >> >>> static int ltv350qv_power(struct ltv350qv *lcd, int power) >>> ^ >>> 1 warning generated. >>> >>> vim +/ltv350qv_power +192 drivers/video/backlight/ltv350qv.c >> >> Odd - the code looks pretty normal. It is possible that your compiler >> is (crazily) inlining ltv350qv_write_reg()? > > This is the same issue in LLVM that was reported by Arnd for generic > KASAN (also see KASAN_STACK_ENABLE option description). By default > KASAN shouldn't have stack instrumentation enabled unless > KASAN_STACK_ENABLE is specified. Perhaps it makes sense to disable it > for KASAN_SW_TAGS config on the kernel test robot. Hi Andrey, Thanks for your advice, we'll take a look. Best Regards, Rong Chen > > [1] https://bugs.llvm.org/show_bug.cgi?id=38809 > _______________________________________________ > kbuild-all mailing list -- kbuild-all@lists.01.org > To unsubscribe send an email to kbuild-all-leave@lists.01.org >