From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (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 17B3B1872 for ; Sun, 10 Jul 2022 16:59:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657472363; x=1689008363; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=8SO8lk2RCb4UnItvUYFu2aqqahdE5WPxwTSY9aJEncg=; b=kbI6tX14/EdNLhbXUyuxKiuKJNJfcEvf99T6VgiNLjWBiF8VJSQBcSUm 9eeJCb43K145+gHYq8KX5N0Bgt5R0CMcgHFnftWl+SkQGfhMVfdKQmMX9 3+RWo7DyUoWDw5kiIyrvLSTaj8DD29AsLJ3eTrsgI+8XcTOJS6ip9xGRq 9pgWGbcAr5gg/8px68qgt8uQSWjueII3WKvxydADHmQNgm5rdjMUbPIjX GbuYpwicVdYCMfPp1elaScADGTw8vm6OI9Zo8haVhVWJaFHZliE2NhWhR HbRwfZ0RXWghgve9Vgj5j2dYlDG1P4GXls60kz06axVsFT6U3LLP42+uY A==; X-IronPort-AV: E=McAfee;i="6400,9594,10404"; a="264302488" X-IronPort-AV: E=Sophos;i="5.92,261,1650956400"; d="scan'208";a="264302488" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jul 2022 09:59:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,261,1650956400"; d="scan'208";a="627237961" Received: from lkp-server01.sh.intel.com (HELO 68b931ab7ac1) ([10.239.97.150]) by orsmga001.jf.intel.com with ESMTP; 10 Jul 2022 09:59:20 -0700 Received: from kbuild by 68b931ab7ac1 with local (Exim 4.95) (envelope-from ) id 1oAaH9-000Q1c-DA; Sun, 10 Jul 2022 16:59:19 +0000 Date: Mon, 11 Jul 2022 00:58:31 +0800 From: kernel test robot To: Yu-Jen Chang , andy@kernel.org, akinobu.mita@gmail.com Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, jserv@ccns.ncku.edu.tw, linux-kernel@vger.kernel.org, Yu-Jen Chang Subject: Re: [PATCH 2/2] lib/string.c: Optimize memchr() Message-ID: <202207110028.KNZ3Yupd-lkp@intel.com> References: <20220710142822.52539-3-arthurchang09@gmail.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220710142822.52539-3-arthurchang09@gmail.com> Hi Yu-Jen, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.19-rc5 next-20220708] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Yu-Jen-Chang/Optimize-memchr/20220710-223118 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b1c428b6c3684ee8ddf4137d68b3e8d51d2a700f config: hexagon-randconfig-r041-20220710 (https://download.01.org/0day-ci/archive/20220711/202207110028.KNZ3Yupd-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6ce63e267aab79ca87bf63453d34dd3909ab978d) 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 # https://github.com/intel-lab-lkp/linux/commit/307ee542c2bd8378b2225910f3f9b982df7a7669 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Yu-Jen-Chang/Optimize-memchr/20220710-223118 git checkout 307ee542c2bd8378b2225910f3f9b982df7a7669 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot All errors (new ones prefixed by >>): >> lib/string.c:902:7: error: conflicting types for 'memchr' void *memchr(const void *p, int c, unsigned long length) ^ include/linux/string.h:162:15: note: previous declaration is here extern void * memchr(const void *,int,__kernel_size_t); ^ 1 error generated. vim +/memchr +902 lib/string.c 891 892 #ifndef __HAVE_ARCH_MEMCHR 893 /** 894 * memchr - Find a character in an area of memory. 895 * @p: The memory area 896 * @c: The byte to search for 897 * @length: The size of the area. 898 * 899 * returns the address of the first occurrence of @c, or %NULL 900 * if @c is not found 901 */ > 902 void *memchr(const void *p, int c, unsigned long length) 903 { 904 u64 mask, val; 905 const void *end = p + length; 906 907 c &= 0xff; 908 if (p <= end - 8) { 909 mask = c; 910 MEMCHR_MASK_GEN(mask); 911 912 for (; p <= end - 8; p += 8) { 913 val = *(u64 *)p ^ mask; 914 if ((val + 0xfefefefefefefeffu) & 915 (~val & 0x8080808080808080u)) 916 break; 917 } 918 } 919 920 for (; p < end; p++) 921 if (*(unsigned char *)p == c) 922 return (void *)p; 923 924 return NULL; 925 } 926 EXPORT_SYMBOL(memchr); 927 #endif 928 -- 0-DAY CI Kernel Test Service https://01.org/lkp