netdev - [net-next:master 408/425] net/rds/connection.c:71:31: sparse: incorrect type in argument 1 (different base types)

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Date:   Thu, 2 Aug 2018 05:16:27 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Ka-Cheong Poon <ka-cheong.poon@...cle.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org
Subject: [net-next:master 408/425] net/rds/connection.c:71:31: sparse:
 incorrect type in argument 1 (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   b69ab96ab13ddaa28a506a2433ae5b12669615e8
commit: e65d4d96334e3ff4fe0064612a93a51c63de08de [408/425] rds: Remove IPv6 dependency
reproduce:
        # apt-get install sparse
        git checkout e65d4d96334e3ff4fe0064612a93a51c63de08de
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> net/rds/connection.c:71:31: sparse: incorrect type in argument 1 (different base types) @@    expected restricted __be32 const [usertype] laddr @@    got unsigned inrestricted __be32 const [usertype] laddr @@
   net/rds/connection.c:71:31:    expected restricted __be32 const [usertype] laddr
   net/rds/connection.c:71:31:    got unsigned int [unsigned] [assigned] [usertype] lhash
>> net/rds/connection.c:71:41: sparse: incorrect type in argument 3 (different base types) @@    expected restricted __be32 const [usertype] faddr @@    got unsigned inrestricted __be32 const [usertype] faddr @@
   net/rds/connection.c:71:41:    expected restricted __be32 const [usertype] faddr
   net/rds/connection.c:71:41:    got unsigned int [unsigned] [assigned] [usertype] fhash
   include/linux/slab.h:631:13: sparse: undefined identifier '__builtin_mul_overflow'
   include/linux/slab.h:631:13: sparse: call with no type!

vim +71 net/rds/connection.c

    53	
    54	static struct hlist_head *rds_conn_bucket(const struct in6_addr *laddr,
    55						  const struct in6_addr *faddr)
    56	{
    57		static u32 rds6_hash_secret __read_mostly;
    58		static u32 rds_hash_secret __read_mostly;
    59	
    60		u32 lhash, fhash, hash;
    61	
    62		net_get_random_once(&rds_hash_secret, sizeof(rds_hash_secret));
    63		net_get_random_once(&rds6_hash_secret, sizeof(rds6_hash_secret));
    64	
    65		lhash = (__force u32)laddr->s6_addr32[3];
    66	#if IS_ENABLED(CONFIG_IPV6)
    67		fhash = __ipv6_addr_jhash(faddr, rds6_hash_secret);
    68	#else
    69		fhash = (__force u32)faddr->s6_addr32[3];
    70	#endif
  > 71		hash = __inet_ehashfn(lhash, 0, fhash, 0, rds_hash_secret);
    72	
    73		return &rds_conn_hash[hash & RDS_CONNECTION_HASH_MASK];
    74	}
    75	

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