netdev - Re: [PATCH net-next] Exempt multicast addresses from five-second neighbor lifetime

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Date:   Tue, 3 Nov 2020 07:23:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jeff Dike <jdike@...mai.com>, netdev@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        David Ahern <dsahern@...il.com>, Jeff Dike <jdike@...mai.com>
Subject: Re: [PATCH net-next] Exempt multicast addresses from five-second
 neighbor lifetime

Hi Jeff,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jeff-Dike/Exempt-multicast-addresses-from-five-second-neighbor-lifetime/20201103-015012
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git c43fd36f7fec6c227c5e8a8ddd7d3fe97472182f
config: powerpc64-randconfig-r001-20201102 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cc91554ebb66e8c9a4b8c67ca2f1343eaac10cf6)
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 powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # https://github.com/0day-ci/linux/commit/e4ca67984d1bb7e5276cf18921c75dcd05ce0275
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jeff-Dike/Exempt-multicast-addresses-from-five-second-neighbor-lifetime/20201103-015012
        git checkout e4ca67984d1bb7e5276cf18921c75dcd05ce0275
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang 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 >>):

>> net/ipv4/arp.c:933:9: warning: 'IN_MULTICAST' macro redefined [-Wmacro-redefined]
   #define IN_MULTICAST(a) ((((long)(a)) & 0xf0000000) == 0xe0000000)
           ^
   include/uapi/linux/in.h:273:9: note: previous definition is here
   #define IN_MULTICAST(a)         IN_CLASSD(a)
           ^
   1 warning generated.

vim +/IN_MULTICAST +933 net/ipv4/arp.c

   932	
 > 933	#define IN_MULTICAST(a) ((((long)(a)) & 0xf0000000) == 0xe0000000)
   934	

---
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" (33350 bytes)