netdev - [net:master 27/28] net/sctp/offload.c:39:33: sparse: warning: incorrect type in argument 2 (different base types)

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Date:   Thu, 14 Feb 2019 14:31:09 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org
Subject: [net:master 27/28] net/sctp/offload.c:39:33: sparse: warning:
 incorrect type in argument 2 (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git master
head:   af98c5a78517c04adb5fd68bb64b1ad6fe3d473f
commit: fc228abc2347e106a44c0e9b29ab70b712c4ca51 [27/28] sctp: call gso_reset_checksum when computing checksum in sctp_gso_segment
reproduce:
        # apt-get install sparse
        git checkout fc228abc2347e106a44c0e9b29ab70b712c4ca51
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

All warnings (new ones prefixed by >>):

>> net/sctp/offload.c:39:33: sparse: warning: incorrect type in argument 2 (different base types)
   net/sctp/offload.c:39:33: sparse:    expected restricted __wsum [usertype] res
   net/sctp/offload.c:39:33: sparse:    got int

sparse warnings: (new ones prefixed by >>)

   net/sctp/offload.c:39:33: sparse: warning: incorrect type in argument 2 (different base types)
>> net/sctp/offload.c:39:33: sparse:    expected restricted __wsum [usertype] res
>> net/sctp/offload.c:39:33: sparse:    got int

vim +39 net/sctp/offload.c

    34	
    35	static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
    36	{
    37		skb->ip_summed = CHECKSUM_NONE;
    38		skb->csum_not_inet = 0;
  > 39		gso_reset_checksum(skb, ~0);
    40		return sctp_compute_cksum(skb, skb_transport_offset(skb));
    41	}
    42	

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