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: i386-randconfig-s002-20201102 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-56-gc09e8239-dirty # 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 make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> "sparse warnings: (new ones prefixed by >>)" net/ipv4/arp.c:933:9: sparse: sparse: preprocessor token IN_MULTICAST redefined net/ipv4/arp.c: note: in included file (through include/linux/in.h): >> include/uapi/linux/in.h:273:9: sparse: this was the original definition >> net/ipv4/arp.c:937:16: sparse: sparse: cast from restricted __be32 vim +937 net/ipv4/arp.c 932 > 933 #define IN_MULTICAST(a) ((((long)(a)) & 0xf0000000) == 0xe0000000) 934 935 static int arp_is_multicast(const void *pkey) 936 { > 937 return IN_MULTICAST(htonl(*((u32 *)pkey))); 938 } 939 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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