* Re: [PATCHv6 2/2] sched/deadline: Walk up cpuset hierarchy to decide root domain when hot-unplug
[not found] <20251117092732.16419-3-piliu@redhat.com>
@ 2025-11-17 11:00 ` kernel test robot
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From: kernel test robot @ 2025-11-17 11:00 UTC (permalink / raw)
To: Pingfan Liu, linux-kernel
Cc: llvm, oe-kbuild-all, Pingfan Liu, Waiman Long, Chen Ridong,
Peter Zijlstra, Juri Lelli, Pierre Gondois, Ingo Molnar,
Vincent Guittot, Dietmar Eggemann, Steven Rostedt, Ben Segall,
Mel Gorman, Valentin Schneider, Tejun Heo, Johannes Weiner,
mkoutny
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 peterz-queue/sched/core linus/master v6.18-rc6 next-20251114]
[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/cgroup-cpuset-Introduce-cpuset_cpus_allowed_locked/20251117-173841
base: https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next
patch link: https://lore.kernel.org/r/20251117092732.16419-3-piliu%40redhat.com
patch subject: [PATCHv6 2/2] sched/deadline: Walk up cpuset hierarchy to decide root domain when hot-unplug
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20251117/202511171845.tuNk3Eb6-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251117/202511171845.tuNk3Eb6-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/202511171845.tuNk3Eb6-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from kernel/sched/build_policy.c:58:
>> kernel/sched/deadline.c:2937:2: error: call to undeclared function 'cpuset_cpus_allowed_locked'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
2937 | cpuset_cpus_allowed_locked(p, cpus);
| ^
1 error generated.
vim +/cpuset_cpus_allowed_locked +2937 kernel/sched/deadline.c
2910
2911 /*
2912 * This function always returns a non-empty bitmap in @cpus. This is because
2913 * if a root domain has reserved bandwidth for DL tasks, the DL bandwidth
2914 * check will prevent CPU hotplug from deactivating all CPUs in that domain.
2915 */
2916 static void dl_get_task_effective_cpus(struct task_struct *p, struct cpumask *cpus)
2917 {
2918 const struct cpumask *hk_msk;
2919
2920 hk_msk = housekeeping_cpumask(HK_TYPE_DOMAIN);
2921 if (housekeeping_enabled(HK_TYPE_DOMAIN)) {
2922 if (!cpumask_intersects(p->cpus_ptr, hk_msk)) {
2923 /*
2924 * CPUs isolated by isolcpu="domain" always belong to
2925 * def_root_domain.
2926 */
2927 cpumask_andnot(cpus, cpu_active_mask, hk_msk);
2928 return;
2929 }
2930 }
2931
2932 /*
2933 * If a root domain holds a DL task, it must have active CPUs. So
2934 * active CPUs can always be found by walking up the task's cpuset
2935 * hierarchy up to the partition root.
2936 */
> 2937 cpuset_cpus_allowed_locked(p, cpus);
2938 }
2939
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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