Hi Yuchung,

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

url:    https://github.com/0day-ci/linux/commits/Neal-Cardwell/tcp-BBR-congestion-control-algorithm/20160917-025323
config: cris-etrax-100lx_v2_defconfig (attached as .config)
compiler: cris-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=cris 

All warnings (new ones prefixed by >>):

   In file included from net/ipv4/route.c:103:0:
>> include/net/tcp.h:769:11: warning: 'packed' attribute ignored for field of type 'struct skb_mstamp' [-Wattributes]
       struct skb_mstamp first_tx_mstamp __packed;
              ^~~~~~~~~~
   include/net/tcp.h:771:11: warning: 'packed' attribute ignored for field of type 'struct skb_mstamp' [-Wattributes]
       struct skb_mstamp delivered_mstamp __packed;
              ^~~~~~~~~~

vim +769 include/net/tcp.h

   753	#define TCPCB_TAGBITS		0x07	/* All tag bits			*/
   754	#define TCPCB_REPAIRED		0x10	/* SKB repaired (no skb_mstamp)	*/
   755	#define TCPCB_EVER_RETRANS	0x80	/* Ever retransmitted frame	*/
   756	#define TCPCB_RETRANS		(TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS| \
   757					TCPCB_REPAIRED)
   758	
   759		__u8		ip_dsfield;	/* IPv4 tos or IPv6 dsfield	*/
   760		__u8		txstamp_ack:1,	/* Record TX timestamp for ack? */
   761				eor:1,		/* Is skb MSG_EOR marked? */
   762				unused:6;
   763		__u32		ack_seq;	/* Sequence number ACK'd	*/
   764		union {
   765			struct {
   766				/* There is space for up to 24 bytes */
   767				__u32 in_flight;/* Bytes in flight when packet sent */
   768				/* start of send pipeline phase */
 > 769				struct skb_mstamp first_tx_mstamp __packed;
   770				/* when we reached the "delivered" count */
   771				struct skb_mstamp delivered_mstamp __packed;
   772				/* pkts S/ACKed so far upon tx of skb, incl retrans: */
   773				__u32 delivered;
   774			} tx;   /* only used for outgoing skbs */
   775			union {
   776				struct inet_skb_parm	h4;
   777	#if IS_ENABLED(CONFIG_IPV6)

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