Hi Xin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Xin-Long/sctp-Implement-RFC6951-UDP-Encapsulation-of-SCTP/20201008-175211
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 9faebeb2d80065926dfbc09cb73b1bb7779a89cd
config: i386-randconfig-s002-20201008 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-218-gc0e96d6d-dirty
        # https://github.com/0day-ci/linux/commit/7dab31e8c96fab2089a651d5a6d06bcf92b011ad
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Xin-Long/sctp-Implement-RFC6951-UDP-Encapsulation-of-SCTP/20201008-175211
        git checkout 7dab31e8c96fab2089a651d5a6d06bcf92b011ad
        # 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@intel.com>

echo
echo "sparse warnings: (new ones prefixed by >>)"
echo
>> net/sctp/sysctl.c:532:39: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] udp_port @@     got int udp_port @@
>> net/sctp/sysctl.c:532:39: sparse:     expected restricted __be16 [usertype] udp_port
>> net/sctp/sysctl.c:532:39: sparse:     got int udp_port

vim +532 net/sctp/sysctl.c

   500	
   501	static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
   502					 void *buffer, size_t *lenp, loff_t *ppos)
   503	{
   504		struct net *net = current->nsproxy->net_ns;
   505		unsigned int min = *(unsigned int *)ctl->extra1;
   506		unsigned int max = *(unsigned int *)ctl->extra2;
   507		struct ctl_table tbl;
   508		int ret, new_value;
   509	
   510		memset(&tbl, 0, sizeof(struct ctl_table));
   511		tbl.maxlen = sizeof(unsigned int);
   512	
   513		if (write)
   514			tbl.data = &new_value;
   515		else
   516			tbl.data = &net->sctp.udp_port;
   517	
   518		ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
   519		if (write && ret == 0) {
   520			struct sock *sk = net->sctp.ctl_sock;
   521	
   522			if (new_value > max || new_value < min)
   523				return -EINVAL;
   524	
   525			net->sctp.udp_port = new_value;
   526			sctp_udp_sock_stop(net);
   527			ret = sctp_udp_sock_start(net);
   528			if (ret)
   529				net->sctp.udp_port = 0;
   530	
   531			lock_sock(sk);
 > 532			sctp_sk(sk)->udp_port = net->sctp.udp_port;
   533			release_sock(sk);
   534		}
   535	
   536		return ret;
   537	}
   538	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org