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

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Message-ID: <202011030632.Z1kVGihJ-lkp@intel.com>
Date:   Tue, 3 Nov 2020 06:34:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jeff Dike <jdike@...mai.com>, netdev@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, 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: 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 <lkp@...el.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-all@lists.01.org

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