linux-kernel - Re: [PATCH v4] sched/fair: Cache NUMA node statistics to avoid O(N) scanning

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Message-ID: <202601291924.phVnpnOi-lkp@intel.com>
Date: Thu, 29 Jan 2026 19:24:45 +0800
From: kernel test robot <lkp@...el.com>
To: Qiliang Yuan <realwujing@...il.com>, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Cc: oe-kbuild-all@...ts.linux.dev, Qiliang Yuan <realwujing@...il.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] sched/fair: Cache NUMA node statistics to avoid O(N)
 scanning

Hi Qiliang,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on tip/master peterz-queue/sched/core linus/master v6.19-rc7 next-20260128]
[cannot apply to tip/auto-latest]
[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/Qiliang-Yuan/sched-fair-Cache-NUMA-node-statistics-to-avoid-O-N-scanning/20260129-112302
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20260129031948.2384178-1-realwujing%40gmail.com
patch subject: [PATCH v4] sched/fair: Cache NUMA node statistics to avoid O(N) scanning
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20260129/202601291924.phVnpnOi-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260129/202601291924.phVnpnOi-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/202601291924.phVnpnOi-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_utility.c:86:
   kernel/sched/topology.c: In function 'init_rootdomain':
>> kernel/sched/topology.c:574:1: warning: label 'free_cpupri' defined but not used [-Wunused-label]
     574 | free_cpupri:
         | ^~~~~~~~~~~


vim +/free_cpupri +574 kernel/sched/topology.c

   571	
   572		return 0;
   573	
 > 574	free_cpupri:
   575		cpupri_cleanup(&rd->cpupri);
   576	free_cpudl:
   577		cpudl_cleanup(&rd->cpudl);
   578	free_rto_mask:
   579		free_cpumask_var(rd->rto_mask);
   580	free_dlo_mask:
   581		free_cpumask_var(rd->dlo_mask);
   582	free_online:
   583		free_cpumask_var(rd->online);
   584	free_span:
   585		free_cpumask_var(rd->span);
   586	out:
   587		return -ENOMEM;
   588	}
   589	

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