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

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Date: Thu, 21 Mar 2024 01:35:55 +0800
From: kernel test robot <lkp@...el.com>
To: Oscar Salvador <osalvador@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
	Vlastimil Babka <vbabka@...e.cz>, Marco Elver <elver@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Oscar Salvador <osalvador@...e.de>,
	syzbot+41bbfdb8d41003d12c0f@...kaller.appspotmail.com
Subject: Re: [PATCH v2 1/2] mm,page_owner: Fix refcount imbalance

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-buildonly-randconfig-004-20240320 (https://download.01.org/0day-ci/archive/20240321/202403210131.YLR6USxm-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240321/202403210131.YLR6USxm-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/202403210131.YLR6USxm-lkp@intel.com/

All warnings (new ones prefixed by >>):

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


vim +/warn_unused_result +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	

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