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 <l...@intel.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-...@lists.01.org
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