Re: [PATCH net-next 1/2] net: move memcpy_to[from]_msg() from skbuff.h to socket.h

Hi yuan,

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

url:    https://github.com/0day-ci/linux/commits/yuan-linyu/net-add-skb_memcpy_to-from-_msg/20171016-154618
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All error/warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/if.h:24:0,
                    from include/linux/inetdevice.h:7,
                    from net//ipv4/netfilter/ipt_MASQUERADE.c:13:
   include/linux/socket.h: In function 'memcpy_from_msg':

quoted

include/linux/socket.h:59:63: error: 'EFAULT' undeclared (first use in this function)

     return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT;
                                                                  ^
   include/linux/socket.h:59:63: note: each undeclared identifier is reported only once for each function it appears in
   include/linux/socket.h: In function 'memcpy_to_msg':
   include/linux/socket.h:64:63: error: 'EFAULT' undeclared (first use in this function)
     return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT;
                                                                  ^
--
   In file included from include/uapi/linux/nfc.h:25:0,
                    from net/nfc/rawsock.c:25:
   include/linux/socket.h: In function 'memcpy_from_msg':

quoted

include/linux/socket.h:59:63: error: 'EFAULT' undeclared (first use in this function)

     return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT;
                                                                  ^
   include/linux/socket.h:59:63: note: each undeclared identifier is reported only once for each function it appears in
   include/linux/socket.h: In function 'memcpy_to_msg':
   include/linux/socket.h:64:63: error: 'EFAULT' undeclared (first use in this function)
     return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT;
                                                                  ^
   In file included from include/uapi/linux/nfc.h:25:0,
                    from net/nfc/rawsock.c:25:
   include/linux/socket.h: In function 'memcpy_from_msg':

quoted

include/linux/socket.h:60:1: warning: control reaches end of non-void function [-Wreturn-type]

    }
    ^

vim +/EFAULT +59 include/linux/socket.h

    56	
    57	static inline int memcpy_from_msg(void *data, struct msghdr *msg, int len)
    58	{
  > 59		return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT;
  > 60	}
    61	

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