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Message-ID: <202510171039.kkg2ItuG-lkp@intel.com>
Date: Fri, 17 Oct 2025 11:09:28 +0800
From: kernel test robot <lkp@...el.com>
To: Pingfan Liu <piliu@...hat.com>, linux-kernel@...r.kernel.org
Cc: 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 warnings:
[auto build test WARNING on tj-cgroup/for-next]
[also build test WARNING 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: openrisc-allnoconfig (https://download.01.org/0day-ci/archive/20251017/202510171039.kkg2ItuG-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251017/202510171039.kkg2ItuG-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/202510171039.kkg2ItuG-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/smp.h:13,
from include/linux/lockdep.h:14,
from include/linux/spinlock.h:63,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:7,
from include/linux/umh.h:4,
from include/linux/kmod.h:9,
from include/linux/module.h:18,
from init/main.c:18:
include/linux/cpuset.h: In function 'cpuset_task_rd_effective_cpus':
>> include/linux/cpumask.h:125:28: warning: return discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
125 | #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cpuset.h:282:16: note: in expansion of macro 'cpu_active_mask'
282 | return cpu_active_mask;
| ^~~~~~~~~~~~~~~
vim +/const +125 include/linux/cpumask.h
^1da177e4c3f415 Linus Torvalds 2005-04-16 77
^1da177e4c3f415 Linus Torvalds 2005-04-16 78 /*
^1da177e4c3f415 Linus Torvalds 2005-04-16 79 * The following particular system cpumasks and operations manage
b3199c025d1646e Rusty Russell 2008-12-30 80 * possible, present, active and online cpus.
^1da177e4c3f415 Linus Torvalds 2005-04-16 81 *
b3199c025d1646e Rusty Russell 2008-12-30 82 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
b3199c025d1646e Rusty Russell 2008-12-30 83 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
4e1a7df4548003f James Morse 2024-05-29 84 * cpu_enabled_mask - has bit 'cpu' set iff cpu can be brought online
b3199c025d1646e Rusty Russell 2008-12-30 85 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
b3199c025d1646e Rusty Russell 2008-12-30 86 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
^1da177e4c3f415 Linus Torvalds 2005-04-16 87 *
b3199c025d1646e Rusty Russell 2008-12-30 88 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
^1da177e4c3f415 Linus Torvalds 2005-04-16 89 *
57f728d59f005df Randy Dunlap 2023-07-31 90 * The cpu_possible_mask is fixed at boot time, as the set of CPU IDs
b3199c025d1646e Rusty Russell 2008-12-30 91 * that it is possible might ever be plugged in at anytime during the
b3199c025d1646e Rusty Russell 2008-12-30 92 * life of that system boot. The cpu_present_mask is dynamic(*),
b3199c025d1646e Rusty Russell 2008-12-30 93 * representing which CPUs are currently plugged in. And
b3199c025d1646e Rusty Russell 2008-12-30 94 * cpu_online_mask is the dynamic subset of cpu_present_mask,
b3199c025d1646e Rusty Russell 2008-12-30 95 * indicating those CPUs available for scheduling.
b3199c025d1646e Rusty Russell 2008-12-30 96 *
b3199c025d1646e Rusty Russell 2008-12-30 97 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
^1da177e4c3f415 Linus Torvalds 2005-04-16 98 * depending on what ACPI reports as currently plugged in, otherwise
b3199c025d1646e Rusty Russell 2008-12-30 99 * cpu_present_mask is just a copy of cpu_possible_mask.
^1da177e4c3f415 Linus Torvalds 2005-04-16 100 *
b3199c025d1646e Rusty Russell 2008-12-30 101 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
b3199c025d1646e Rusty Russell 2008-12-30 102 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
^1da177e4c3f415 Linus Torvalds 2005-04-16 103 *
^1da177e4c3f415 Linus Torvalds 2005-04-16 104 * Subtleties:
57f728d59f005df Randy Dunlap 2023-07-31 105 * 1) UP ARCHes (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
^1da177e4c3f415 Linus Torvalds 2005-04-16 106 * assumption that their single CPU is online. The UP
b3199c025d1646e Rusty Russell 2008-12-30 107 * cpu_{online,possible,present}_masks are placebos. Changing them
^1da177e4c3f415 Linus Torvalds 2005-04-16 108 * will have no useful affect on the following num_*_cpus()
^1da177e4c3f415 Linus Torvalds 2005-04-16 109 * and cpu_*() macros in the UP case. This ugliness is a UP
^1da177e4c3f415 Linus Torvalds 2005-04-16 110 * optimization - don't waste any instructions or memory references
^1da177e4c3f415 Linus Torvalds 2005-04-16 111 * asking if you're online or how many CPUs there are if there is
^1da177e4c3f415 Linus Torvalds 2005-04-16 112 * only one CPU.
^1da177e4c3f415 Linus Torvalds 2005-04-16 113 */
^1da177e4c3f415 Linus Torvalds 2005-04-16 114
4b804c85dc37db6 Rasmus Villemoes 2016-01-20 115 extern struct cpumask __cpu_possible_mask;
4b804c85dc37db6 Rasmus Villemoes 2016-01-20 116 extern struct cpumask __cpu_online_mask;
4e1a7df4548003f James Morse 2024-05-29 117 extern struct cpumask __cpu_enabled_mask;
4b804c85dc37db6 Rasmus Villemoes 2016-01-20 118 extern struct cpumask __cpu_present_mask;
4b804c85dc37db6 Rasmus Villemoes 2016-01-20 119 extern struct cpumask __cpu_active_mask;
e40f74c535b8a0e Peter Zijlstra 2021-01-19 120 extern struct cpumask __cpu_dying_mask;
5aec01b834fd6f8 Rasmus Villemoes 2016-01-20 121 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
5aec01b834fd6f8 Rasmus Villemoes 2016-01-20 122 #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
4e1a7df4548003f James Morse 2024-05-29 123 #define cpu_enabled_mask ((const struct cpumask *)&__cpu_enabled_mask)
5aec01b834fd6f8 Rasmus Villemoes 2016-01-20 124 #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
5aec01b834fd6f8 Rasmus Villemoes 2016-01-20 @125 #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
e40f74c535b8a0e Peter Zijlstra 2021-01-19 126 #define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask)
b3199c025d1646e Rusty Russell 2008-12-30 127
--
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