Hi Yafang,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Yafang-Shao/net-tcp-track-all-TCP-IP-state-transition-in-tcp_set_state/20171112-203643
config: blackfin-allmodconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
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=blackfin 

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

   In file included from include/net/tcp.h:49:0,
                    from net/netfilter/ipvs/ip_vs_proto_tcp.c:27:
>> include/trace/events/tcp.h:12:31: error: expected identifier or '(' before '{' token
    #define tcp_state_name(state) { state, #state }
                                  ^
>> net/netfilter/ipvs/ip_vs_proto_tcp.c:424:21: note: in expansion of macro 'tcp_state_name'
    static const char * tcp_state_name(int state)
                        ^~~~~~~~~~~~~~
>> net/netfilter/ipvs/ip_vs_proto_tcp.c:425:1: error: expected identifier or '(' before '{' token
    {
    ^
   In file included from include/net/tcp.h:49:0,
                    from net/netfilter/ipvs/ip_vs_proto_tcp.c:27:
   net/netfilter/ipvs/ip_vs_proto_tcp.c: In function 'set_tcp_state':
>> include/trace/events/tcp.h:12:31: error: expected expression before '{' token
    #define tcp_state_name(state) { state, #state }
                                  ^
>> include/net/ip_vs.h:228:37: note: in expansion of macro 'tcp_state_name'
       printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
                                        ^~~~~~~~~~~
>> net/netfilter/ipvs/ip_vs_proto_tcp.c:541:3: note: in expansion of macro 'IP_VS_DBG_BUF'
      IP_VS_DBG_BUF(8, "%s %s [%c%c%c%c] %s:%d->"
      ^~~~~~~~~~~~~
   net/netfilter/ipvs/ip_vs_proto_tcp.c: At top level:
>> net/netfilter/ipvs/ip_vs_proto_tcp.c:737:17: error: 'tcp_state_name' undeclared here (not in a function)
     .state_name =  tcp_state_name,
                    ^~~~~~~~~~~~~~
--
   In file included from include/net/tcp.h:49:0,
                    from net/netfilter//ipvs/ip_vs_proto_tcp.c:27:
>> include/trace/events/tcp.h:12:31: error: expected identifier or '(' before '{' token
    #define tcp_state_name(state) { state, #state }
                                  ^
   net/netfilter//ipvs/ip_vs_proto_tcp.c:424:21: note: in expansion of macro 'tcp_state_name'
    static const char * tcp_state_name(int state)
                        ^~~~~~~~~~~~~~
   net/netfilter//ipvs/ip_vs_proto_tcp.c:425:1: error: expected identifier or '(' before '{' token
    {
    ^
   In file included from include/net/tcp.h:49:0,
                    from net/netfilter//ipvs/ip_vs_proto_tcp.c:27:
   net/netfilter//ipvs/ip_vs_proto_tcp.c: In function 'set_tcp_state':
>> include/trace/events/tcp.h:12:31: error: expected expression before '{' token
    #define tcp_state_name(state) { state, #state }
                                  ^
>> include/net/ip_vs.h:228:37: note: in expansion of macro 'tcp_state_name'
       printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
                                        ^~~~~~~~~~~
   net/netfilter//ipvs/ip_vs_proto_tcp.c:541:3: note: in expansion of macro 'IP_VS_DBG_BUF'
      IP_VS_DBG_BUF(8, "%s %s [%c%c%c%c] %s:%d->"
      ^~~~~~~~~~~~~
   net/netfilter//ipvs/ip_vs_proto_tcp.c: At top level:
   net/netfilter//ipvs/ip_vs_proto_tcp.c:737:17: error: 'tcp_state_name' undeclared here (not in a function)
     .state_name =  tcp_state_name,
                    ^~~~~~~~~~~~~~

vim +12 include/trace/events/tcp.h

e086101b Cong Wang 2017-10-13  11  
e8fce239 Song Liu  2017-10-23 @12  #define tcp_state_name(state)	{ state, #state }
e8fce239 Song Liu  2017-10-23  13  #define show_tcp_state_name(val)			\
e8fce239 Song Liu  2017-10-23  14  	__print_symbolic(val,				\
e8fce239 Song Liu  2017-10-23  15  		tcp_state_name(TCP_ESTABLISHED),	\
e8fce239 Song Liu  2017-10-23  16  		tcp_state_name(TCP_SYN_SENT),		\
e8fce239 Song Liu  2017-10-23  17  		tcp_state_name(TCP_SYN_RECV),		\
e8fce239 Song Liu  2017-10-23  18  		tcp_state_name(TCP_FIN_WAIT1),		\
e8fce239 Song Liu  2017-10-23  19  		tcp_state_name(TCP_FIN_WAIT2),		\
e8fce239 Song Liu  2017-10-23  20  		tcp_state_name(TCP_TIME_WAIT),		\
e8fce239 Song Liu  2017-10-23  21  		tcp_state_name(TCP_CLOSE),		\
e8fce239 Song Liu  2017-10-23  22  		tcp_state_name(TCP_CLOSE_WAIT),		\
e8fce239 Song Liu  2017-10-23  23  		tcp_state_name(TCP_LAST_ACK),		\
e8fce239 Song Liu  2017-10-23  24  		tcp_state_name(TCP_LISTEN),		\
e8fce239 Song Liu  2017-10-23  25  		tcp_state_name(TCP_CLOSING),		\
e8fce239 Song Liu  2017-10-23  26  		tcp_state_name(TCP_NEW_SYN_RECV))
e8fce239 Song Liu  2017-10-23  27  

:::::: The code at line 12 was first introduced by commit
:::::: e8fce23946b7e7eadf25ad78d8207c22903dfe27 tcp: add tracepoint trace_tcp_set_state()

:::::: TO: Song Liu <songliubraving@fb.com>
:::::: CC: David S. Miller <davem@davemloft.net>

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