Re: [PATCH] tracing: Cleanup event_enable_trigger_parse() by using __free()

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

Hi Steven,

kernel test robot noticed the following build warnings:

[auto build test WARNING on trace/for-next]
[also build test WARNING on linus/master v7.2-rc6 next-20260804]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/tracing-Cleanup-event_enable_trigger_parse-by-using-__free/20260805-073956
base:   https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next
patch link:    https://lore.kernel.org/r/20260701174829.67ab8a33%40gandalf.local.home
patch subject: [PATCH] tracing: Cleanup event_enable_trigger_parse() by using __free()
config: s390-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260805/202608050839.Ip5dU0Jz-lkp@intel.com/config)
compiler: s390x-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260805/202608050839.Ip5dU0Jz-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/202608050839.Ip5dU0Jz-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from ./include/linux/file.h:13,
                    from ./include/linux/kernel_read_file.h:5,
                    from ./include/linux/security.h:26,
                    from kernel/trace/trace_events_trigger.c:8:
   kernel/trace/trace_events_trigger.c: In function 'event_enable_trigger_parse':
>> ./include/linux/cleanup.h:228:22: warning: ignoring return value of '__must_check_fn' declared with attribute 'warn_unused_result' [-Wunused-result]
     228 |         ((typeof(p)) __must_check_fn((__force const volatile void *)__get_and_null(p, NULL)))
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/trace_events_trigger.c:1842:9: note: in expansion of macro 'no_free_ptr'
    1842 |         no_free_ptr(enable_data);
         |         ^~~~~~~~~~~


vim +228 ./include/linux/cleanup.h

85be6d84244706 Peter Zijlstra 2023-08-15  226  
54da6a0924311c Peter Zijlstra 2023-05-26  227  #define no_free_ptr(p) \
366fef794bd2b7 Ilpo Järvinen  2025-03-10 @228  	((typeof(p)) __must_check_fn((__force const volatile void *)__get_and_null(p, NULL)))
54da6a0924311c Peter Zijlstra 2023-05-26  229  

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