linux-kernel - Re: [PATCH 1/3] lib/string: optimized memcpy

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Date:   Fri, 25 Jun 2021 22:41:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Matteo Croce <mcroce@...ux.microsoft.com>,
        linux-kernel@...r.kernel.org, Nick Kossifidis <mick@....forth.gr>,
        Guo Ren <guoren@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        David Laight <David.Laight@...lab.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Drew Fustini <drew@...gleboard.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-arch@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] lib/string: optimized memcpy

Hi Matteo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on hch-configfs/for-next linus/master v5.13-rc7 next-20210624]
[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]

url:    https://github.com/0day-ci/linux/commits/Matteo-Croce/lib-string-optimized-mem-functions/20210625-090352
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0c18f29aae7ce3dadd26d8ee3505d07cc982df75
config: x86_64-randconfig-a002-20210622 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9ca0171a9ffdef5fdb1511d197a3fd72490362de)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/e9af69e22b4b9fe629d72f5c8b022aca3244cc01
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matteo-Croce/lib-string-optimized-mem-functions/20210625-090352
        git checkout e9af69e22b4b9fe629d72f5c8b022aca3244cc01
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> lib/string.c:52:27: warning: unused variable 'word_mask' [-Wunused-const-variable]
   static const unsigned int word_mask = bytes_long - 1;
                             ^
   1 warning generated.
--
   lib/string.c:901: warning: Function parameter or member 'h' not described in 'MERGE_UL'
   lib/string.c:901: warning: Function parameter or member 'l' not described in 'MERGE_UL'
   lib/string.c:901: warning: Function parameter or member 'd' not described in 'MERGE_UL'
>> lib/string.c:901: warning: expecting prototype for memcpy(). Prototype was for MERGE_UL() instead


vim +/word_mask +52 lib/string.c

    50	
    51	static const unsigned int bytes_long = sizeof(long);
  > 52	static const unsigned int word_mask = bytes_long - 1;
    53	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (43108 bytes)