[trace:for-next 38/40] kernel/trace/trace_osnoise.c:1584:2: error: void function 'osnoise_init_hotplug_support' should not return a value

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git for-next
head:   6a2cbc58d6c9d90cd74288cc497c2b45815bc064
commit: c8895e271f7994a3ecb13b8a280e39aa53879545 [38/40] trace/osnoise: Support hotplug operations
config: powerpc-randconfig-r031-20210626 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 557b101ce714e39438ba1d39c4c50b03e12fcb96)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/commit/?id=c8895e271f7994a3ecb13b8a280e39aa53879545
        git remote add trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
        git fetch --no-tags trace for-next
        git checkout c8895e271f7994a3ecb13b8a280e39aa53879545
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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

All errors (new ones prefixed by >>):

   In file included from kernel/trace/trace_osnoise.c:19:
   In file included from include/linux/kthread.h:6:
   In file included from include/linux/sched.h:14:
   In file included from include/linux/pid.h:5:
   In file included from include/linux/rculist.h:10:
   In file included from include/linux/list.h:9:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:32:
   In file included from arch/powerpc/include/asm/bitops.h:62:
   arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:308:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
   kernel/trace/trace_osnoise.c:657:6: warning: no previous prototype for function 'osnoise_trace_irq_entry' [-Wmissing-prototypes]
   void osnoise_trace_irq_entry(int id)
        ^
   kernel/trace/trace_osnoise.c:657:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void osnoise_trace_irq_entry(int id)
   ^
   static 
   kernel/trace/trace_osnoise.c:680:6: warning: no previous prototype for function 'osnoise_trace_irq_exit' [-Wmissing-prototypes]
   void osnoise_trace_irq_exit(int id, const char *desc)
        ^
   kernel/trace/trace_osnoise.c:680:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void osnoise_trace_irq_exit(int id, const char *desc)
   ^
   static 
   kernel/trace/trace_osnoise.c:739:5: warning: no previous prototype for function 'hook_irq_events' [-Wmissing-prototypes]
   int hook_irq_events(void)
       ^
   kernel/trace/trace_osnoise.c:739:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int hook_irq_events(void)
   ^
   static 
   kernel/trace/trace_osnoise.c:771:6: warning: no previous prototype for function 'unhook_irq_events' [-Wmissing-prototypes]
   void unhook_irq_events(void)
        ^
   kernel/trace/trace_osnoise.c:771:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void unhook_irq_events(void)
   ^
   static 
   kernel/trace/trace_osnoise.c:788:6: warning: no previous prototype for function 'trace_softirq_entry_callback' [-Wmissing-prototypes]
   void trace_softirq_entry_callback(void *data, unsigned int vec_nr)
        ^
   kernel/trace/trace_osnoise.c:788:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void trace_softirq_entry_callback(void *data, unsigned int vec_nr)
   ^
   static 
   kernel/trace/trace_osnoise.c:811:6: warning: no previous prototype for function 'trace_softirq_exit_callback' [-Wmissing-prototypes]
   void trace_softirq_exit_callback(void *data, unsigned int vec_nr)
        ^
   kernel/trace/trace_osnoise.c:811:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void trace_softirq_exit_callback(void *data, unsigned int vec_nr)
   ^
   static 
   kernel/trace/trace_osnoise.c:953:1: warning: no previous prototype for function 'trace_sched_switch_callback' [-Wmissing-prototypes]
   trace_sched_switch_callback(void *data, bool preempt, struct task_struct *p,
   ^
   kernel/trace/trace_osnoise.c:952:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void
   ^
   static 
   kernel/trace/trace_osnoise.c:971:5: warning: no previous prototype for function 'hook_thread_events' [-Wmissing-prototypes]
   int hook_thread_events(void)
       ^
   kernel/trace/trace_osnoise.c:971:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int hook_thread_events(void)
   ^
   static 
   kernel/trace/trace_osnoise.c:988:6: warning: no previous prototype for function 'unhook_thread_events' [-Wmissing-prototypes]
   void unhook_thread_events(void)
        ^
   kernel/trace/trace_osnoise.c:988:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void unhook_thread_events(void)
   ^
   static 
   kernel/trace/trace_osnoise.c:1000:6: warning: no previous prototype for function 'save_osn_sample_stats' [-Wmissing-prototypes]
   void save_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
        ^
   kernel/trace/trace_osnoise.c:1000:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void save_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
   ^
   static 
   kernel/trace/trace_osnoise.c:1015:6: warning: no previous prototype for function 'diff_osn_sample_stats' [-Wmissing-prototypes]
   void diff_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
        ^
   kernel/trace/trace_osnoise.c:1015:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void diff_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
   ^
   static 
   kernel/trace/trace_osnoise.c:1213:3: warning: comparison of distinct pointer types ('typeof ((interval)) *' (aka 'long long *') and 'uint64_t *' (aka 'unsigned long long *')) [-Wcompare-distinct-pointer-types]
                   do_div(interval, USEC_PER_MSEC);
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/div64.h:228:28: note: expanded from macro 'do_div'
           (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
                  ~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
>> kernel/trace/trace_osnoise.c:1584:2: error: void function 'osnoise_init_hotplug_support' should not return a value [-Wreturn-type]
           return 0;
           ^      ~
   13 warnings and 1 error generated.


vim +/osnoise_init_hotplug_support +1584 kernel/trace/trace_osnoise.c

  1569	
  1570	static void osnoise_init_hotplug_support(void)
  1571	{
  1572		int ret;
  1573	
  1574		ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "trace/osnoise:online",
  1575					osnoise_cpu_init, osnoise_cpu_die);
  1576		if (ret < 0)
  1577			pr_warn(BANNER "Error to init cpu hotplug support\n");
  1578	
  1579		return;
  1580	}
  1581	#else /* CONFIG_HOTPLUG_CPU */
  1582	static void osnoise_init_hotplug_support(void)
  1583	{
> 1584		return 0;
  1585	}
  1586	#endif /* CONFIG_HOTPLUG_CPU */
  1587	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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