linux-kernel - Re: [PATCH 1/5] tracing: Fix checking of freed trace_event

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Message-ID: <202602110125.71oIfNm0-lkp@intel.com>
Date: Wed, 11 Feb 2026 01:40:48 +0800
From: kernel test robot <lkp@...el.com>
To: Petr Pavlu <petr.pavlu@...e.com>, Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tom Zanussi <zanussi@...nel.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Petr Pavlu <petr.pavlu@...e.com>
Subject: Re: [PATCH 1/5] tracing: Fix checking of freed trace_event_file for
 hist files

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: x86_64-buildonly-randconfig-004-20260210 (https://download.01.org/0day-ci/archive/20260211/202602110125.71oIfNm0-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260211/202602110125.71oIfNm0-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602110125.71oIfNm0-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/trace/trace_events.c: In function 'remove_event_file_dir':
>> kernel/trace/trace_events.c:1300:9: error: implicit declaration of function 'hist_poll_wakeup' [-Wimplicit-function-declaration]
    1300 |         hist_poll_wakeup();
         |         ^~~~~~~~~~~~~~~~


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	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki