Re: [PATCH] sched: Enabled schedstat when schedstat tracepoints are enabled

[kbuild test robot]

Hi Steven,

[auto build test ERROR on tip/sched/core]
[also build test ERROR on v4.11-rc6 next-20170412]
[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/Steven-Rostedt/sched-Enabled-schedstat-when-schedstat-tracepoints-are-enabled/20170413-082900
config: i386-randconfig-x006-201715 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> kernel/sched/core.c:2289:5: error: redefinition of 'schedstat_tracepoint_reg'
    int schedstat_tracepoint_reg(void)
        ^~~~~~~~~~~~~~~~~~~~~~~~
   In file included from kernel/sched/core.c:8:0:
   include/linux/sched.h:1463:19: note: previous definition of 
'schedstat_tracepoint_reg' was here
    static inline int schedstat_tracepoint_reg(void) { return 0; }
                      ^~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/sched/core.c:2299:6: error: redefinition of 
>> 'schedstat_tracepoint_unreg'
    void schedstat_tracepoint_unreg(void)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from kernel/sched/core.c:8:0:
   include/linux/sched.h:1464:20: note: previous definition of 
'schedstat_tracepoint_unreg' was here
    static inline void schedstat_tracepoint_unreg(void) { }
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c: In function 'schedstat_tracepoint_reg':
   kernel/sched/core.c:2297:1: warning: control reaches end of non-void 
function [-Wreturn-type]
    }
    ^

vim +/schedstat_tracepoint_reg +2289 kernel/sched/core.c

  2283   * regfunc/unregfunc functions. They are protected by the tracepoint 
mutex.
  2284   *     See kernel/tracepoint.c:tracepoint_add_func().
  2285   *
  2286   * The modifications to schedstat_tracepoint_ref and 
schedstat_save_state
  2287   * are only done under that mutex, and do not need further protection.
  2288   */
> 2289  int schedstat_tracepoint_reg(void)
  2290  {
  2291          if (!schedstat_tracepoint_ref) {
  2292                  schedstat_save_state = schedstat_enabled();
  2293                  if (!schedstat_save_state)
  2294                          set_schedstats(true);
  2295          }
  2296          schedstat_tracepoint_ref++;
  2297  }
  2298  
> 2299  void schedstat_tracepoint_unreg(void)
  2300  {
  2301          schedstat_tracepoint_ref--;
  2302          if (schedstat_tracepoint_ref || schedstat_save_state)

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