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

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Date:   Fri, 25 Jun 2021 13:01:53 +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, 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: powerpc64-randconfig-p001-20210622 (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
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/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=gcc-9.3.0 make.cross ARCH=powerpc64 

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: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 +901 lib/string.c

   888	
   889	#ifndef __HAVE_ARCH_MEMCPY
   890	/**
   891	 * memcpy - Copy one area of memory to another
   892	 * @dest: Where to copy to
   893	 * @src: Where to copy from
   894	 * @count: The size of the area.
   895	 *
   896	 * You should not use this function to access IO space, use memcpy_toio()
   897	 * or memcpy_fromio() instead.
   898	 */
   899	
   900	#ifdef __BIG_ENDIAN
 > 901	#define MERGE_UL(h, l, d) ((h) << ((d) * 8) | (l) >> ((bytes_long - (d)) * 8))
   902	#else
   903	#define MERGE_UL(h, l, d) ((h) >> ((d) * 8) | (l) << ((bytes_long - (d)) * 8))
   904	#endif
   905	

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

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