Hi Zhenliang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.1-rc6 next-20190418]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Zhenliang-Wei/signal-trace_signal_deliver-when-signal_group_exit/20190423-062107
config: i386-randconfig-x010-201916 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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


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

   In file included from arch/x86/include/uapi/asm/signal.h:94:0,
                    from arch/x86/include/asm/signal.h:36,
                    from include/uapi/linux/signal.h:5,
                    from include/linux/signal_types.h:10,
                    from include/linux/sched.h:28,
                    from include/linux/sched/mm.h:7,
                    from kernel/signal.c:16:
   kernel/signal.c: In function 'get_signal':
>> include/uapi/asm-generic/signal-defs.h:24:17: error: passing argument 3 of 'trace_signal_deliver' from incompatible pointer type [-Werror=incompatible-pointer-types]
    #define SIG_DFL ((__force __sighandler_t)0) /* default signal handling */
                    ^
>> kernel/signal.c:2444:50: note: in expansion of macro 'SIG_DFL'
      trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, SIG_DFL);
                                                     ^~~~~~~
   In file included from include/trace/syscall.h:5:0,
                    from include/linux/syscalls.h:86,
                    from kernel/signal.c:29:
   include/linux/tracepoint.h:235:21: note: expected 'struct k_sigaction *' but argument is of type 'void (*)(int)'
     static inline void trace_##name(proto)    \
                        ^
   include/linux/tracepoint.h:398:2: note: in expansion of macro '__DECLARE_TRACE'
     __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),  \
     ^~~~~~~~~~~~~~~
   include/linux/tracepoint.h:534:2: note: in expansion of macro 'DECLARE_TRACE'
     DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
     ^~~~~~~~~~~~~
>> include/trace/events/signal.h:96:1: note: in expansion of macro 'TRACE_EVENT'
    TRACE_EVENT(signal_deliver,
    ^~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/trace_signal_deliver +24 include/uapi/asm-generic/signal-defs.h

b1ecb4c3 include/asm-generic/signal.h Al Viro         2005-05-04  23  
b1ecb4c3 include/asm-generic/signal.h Al Viro         2005-05-04 @24  #define SIG_DFL	((__force __sighandler_t)0)	/* default signal handling */
b1ecb4c3 include/asm-generic/signal.h Al Viro         2005-05-04  25  #define SIG_IGN	((__force __sighandler_t)1)	/* ignore signal */
b1ecb4c3 include/asm-generic/signal.h Al Viro         2005-05-04  26  #define SIG_ERR	((__force __sighandler_t)-1)	/* error return from signal */
b1ecb4c3 include/asm-generic/signal.h Al Viro         2005-05-04  27  #endif
ad158879 include/asm-generic/signal.h David Woodhouse 2006-04-27  28  

:::::: The code at line 24 was first introduced by commit
:::::: b1ecb4c3a9e33cc8b93ac9cb046b535b72a15f68 [PATCH] asm/signal.h unification

:::::: TO: Al Viro <viro@www.linux.org.uk>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

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