linux-kernel - Re: [PATCHv2] sched/deadline: Walk up cpuset hierarchy to decide root domain when hot-unplug

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Message-ID: <202510170932.nTEduJGM-lkp@intel.com>
Date: Fri, 17 Oct 2025 10:17:36 +0800
From: kernel test robot <lkp@...el.com>
To: Pingfan Liu <piliu@...hat.com>, linux-kernel@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Pingfan Liu <piliu@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Pierre Gondois <pierre.gondois@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	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>
Subject: Re: [PATCHv2] sched/deadline: Walk up cpuset hierarchy to decide
 root domain when hot-unplug

Hi Pingfan,

kernel test robot noticed the following build errors:

[auto build test ERROR on tj-cgroup/for-next]
[also build test ERROR on tip/sched/core tip/master linus/master v6.18-rc1 next-20251016]
[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/Pingfan-Liu/sched-deadline-Walk-up-cpuset-hierarchy-to-decide-root-domain-when-hot-unplug/20251016-200452
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next
patch link:    https://lore.kernel.org/r/20251016120041.17990-1-piliu%40redhat.com
patch subject: [PATCHv2] sched/deadline: Walk up cpuset hierarchy to decide root domain when hot-unplug
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20251017/202510170932.nTEduJGM-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 754ebc6ebb9fb9fbee7aef33478c74ea74949853)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251017/202510170932.nTEduJGM-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/202510170932.nTEduJGM-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from init/main.c:53:
>> include/linux/cpuset.h:282:9: error: returning 'const struct cpumask *' from a function with result type 'struct cpumask *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
     282 |         return cpu_active_mask;
         |                ^~~~~~~~~~~~~~~
   include/linux/cpumask.h:125:27: note: expanded from macro 'cpu_active_mask'
     125 | #define cpu_active_mask   ((const struct cpumask *)&__cpu_active_mask)
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 error generated.


vim +282 include/linux/cpuset.h

   279	
   280	static inline struct cpumask *cpuset_task_rd_effective_cpus(struct task_struct *p)
   281	{
 > 282		return cpu_active_mask;
   283	}
   284	

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