Re: [PATCH v2 1/2] mm,page_owner: Fix refcount imbalance

[kernel test robot]

Hi Oscar,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master next-20240320]
[cannot apply to v6.8]
[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/Oscar-Salvador/mm-page_owner-Fix-refcount-imbalance/20240320-023302
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240319183212.17156-2-osalvador%40suse.de
patch subject: [PATCH v2 1/2] mm,page_owner: Fix refcount imbalance
config: x86_64-randconfig-r081-20240320 (https://download.01.org/0day-ci/archive/20240321/202403210718.9IiE8NIU-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240321/202403210718.9IiE8NIU-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403210718.9IiE8NIU-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   mm/page_owner.c: In function 'dec_stack_record_count':
>> mm/page_owner.c:213:3: warning: ignoring return value of 'refcount_sub_and_test', declared with attribute warn_unused_result [-Wunused-result]
     213 |   refcount_sub_and_test(nr_base_pages, &stack_record->count);
         |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/refcount_sub_and_test +213 mm/page_owner.c

   206	
   207	static void dec_stack_record_count(depot_stack_handle_t handle,
   208					   int nr_base_pages)
   209	{
   210		struct stack_record *stack_record = __stack_depot_get_stack_record(handle);
   211	
   212		if (stack_record)
 > 213			refcount_sub_and_test(nr_base_pages, &stack_record->count);
   214	}
   215	

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