Hi Yangbo,

I love your patch! Perhaps something to improve:

[auto build test WARNING on 19938bafa7ae8fc0a4a2c1c1430abb1a04668da1]

url:    https://github.com/0day-ci/linux/commits/Yangbo-Lu/ptp-support-virtual-clocks-and-timestamping/20210625-172554
base:   19938bafa7ae8fc0a4a2c1c1430abb1a04668da1
config: x86_64-randconfig-r013-20210625 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9ca0171a9ffdef5fdb1511d197a3fd72490362de)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/e6720a23e3833ed72016804e74875c63c8f2c414
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yangbo-Lu/ptp-support-virtual-clocks-and-timestamping/20210625-172554
        git checkout e6720a23e3833ed72016804e74875c63c8f2c414
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   net/mptcp/sockopt.c:218:45: error: indirection requires pointer operand ('int' invalid)
                   if (copy_from_sockptr(val, optval, sizeof(*val)))
                                                             ^~~~
>> net/mptcp/sockopt.c:218:25: warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'void *' [-Wint-conversion]
                   if (copy_from_sockptr(val, optval, sizeof(*val)))
                                         ^~~
   include/linux/sockptr.h:53:43: note: passing argument to parameter 'dst' here
   static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
                                             ^
   1 warning and 1 error generated.


vim +218 net/mptcp/sockopt.c

   202	
   203	static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk,
   204							    int optname,
   205							    sockptr_t optval,
   206							    unsigned int optlen)
   207	{
   208		struct mptcp_subflow_context *subflow;
   209		struct sock *sk = (struct sock *)msk;
   210		struct so_timestamping timestamping;
   211		int val, ret;
   212	
   213		if (optlen == sizeof(timestamping)) {
   214			if (copy_from_sockptr(&timestamping, optval,
   215					      sizeof(timestamping)))
   216				return -EFAULT;
   217		} else if (optlen == sizeof(int)) {
 > 218			if (copy_from_sockptr(val, optval, sizeof(*val)))
   219				return -EFAULT;
   220	
   221			memset(&timestamping, 0, sizeof(timestamping));
   222			timestamping.flags = val;
   223		} else {
   224			return -EINVAL;
   225		}
   226	
   227		ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
   228				      KERNEL_SOCKPTR(&timestamping),
   229				      sizeof(timestamping));
   230		if (ret)
   231			return ret;
   232	
   233		lock_sock(sk);
   234	
   235		mptcp_for_each_subflow(msk, subflow) {
   236			struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
   237			bool slow = lock_sock_fast(ssk);
   238	
   239			sock_set_timestamping(sk, optname, timestamping);
   240			unlock_sock_fast(ssk, slow);
   241		}
   242	
   243		release_sock(sk);
   244	
   245		return 0;
   246	}
   247	

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