Re: [PATCH 1/5] tracing: Fix checking of freed trace_event_file for hist files

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

Hi Petr,

kernel test robot noticed the following build errors:

[auto build test ERROR on 05f7e89ab9731565d8a62e3b5d1ec206485eeb0b]

url:    https://github.com/intel-lab-lkp/linux/commits/Petr-Pavlu/tracing-Fix-checking-of-freed-trace_event_file-for-hist-files/20260210-194023
base:   05f7e89ab9731565d8a62e3b5d1ec206485eeb0b
patch link:    https://lore.kernel.org/r/20260210113427.1068932-2-petr.pavlu%40suse.com
patch subject: [PATCH 1/5] tracing: Fix checking of freed trace_event_file for hist files
config: sparc64-defconfig (https://download.01.org/0day-ci/archive/20260211/202602110247.8HeuKXss-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260211/202602110247.8HeuKXss-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602110247.8HeuKXss-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/trace/trace_events.c:1300:2: error: call to undeclared function 'hist_poll_wakeup'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1300 |         hist_poll_wakeup();
         |         ^
   1 error generated.


vim +/hist_poll_wakeup +1300 kernel/trace/trace_events.c

  1289	
  1290	static void remove_event_file_dir(struct trace_event_file *file)
  1291	{
  1292		eventfs_remove_dir(file->ei);
  1293		list_del(&file->list);
  1294		remove_subsystem(file->system);
  1295		free_event_filter(file->filter);
  1296		file->flags |= EVENT_FILE_FL_FREED;
  1297		event_file_put(file);
  1298	
  1299		/* Wake up hist poll waiters to notice the EVENT_FILE_FL_FREED flag. */
> 1300		hist_poll_wakeup();
  1301	}
  1302	

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