linux-kernel - Re: [PATCH v3 3/5] sched/fair: Switch to task based throttle model

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Message-ID: <202507162238.qiw7kyu0-lkp@intel.com>
Date: Wed, 16 Jul 2025 23:20:55 +0800
From: kernel test robot <lkp@...el.com>
To: Aaron Lu <ziqianlu@...edance.com>,
	Valentin Schneider <vschneid@...hat.com>,
	Ben Segall <bsegall@...gle.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Josh Don <joshdon@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Xi Wang <xii@...gle.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>, Mel Gorman <mgorman@...e.de>,
	Chuyi Zhou <zhouchuyi@...edance.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Florian Bezdeka <florian.bezdeka@...mens.com>,
	Songtang Liu <liusongtang@...edance.com>
Subject: Re: [PATCH v3 3/5] sched/fair: Switch to task based throttle model

Hi Aaron,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on next-20250716]
[cannot apply to linus/master v6.16-rc6]
[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/Aaron-Lu/sched-fair-Add-related-data-structure-for-task-based-throttle/20250715-152307
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20250715071658.267-4-ziqianlu%40bytedance.com
patch subject: [PATCH v3 3/5] sched/fair: Switch to task based throttle model
config: xtensa-randconfig-r121-20250716 (https://download.01.org/0day-ci/archive/20250716/202507162238.qiw7kyu0-lkp@intel.com/config)
compiler: xtensa-linux-gcc (GCC) 8.5.0
reproduce: (https://download.01.org/0day-ci/archive/20250716/202507162238.qiw7kyu0-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/202507162238.qiw7kyu0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/sched/core.c: note: in included file (through arch/xtensa/include/asm/bitops.h, include/linux/bitops.h, include/linux/thread_info.h, ...):
   arch/xtensa/include/asm/processor.h:105:2: sparse: sparse: Unsupported xtensa ABI
   arch/xtensa/include/asm/processor.h:135:2: sparse: sparse: Unsupported Xtensa ABI
   kernel/sched/core.c: note: in included file:
>> kernel/sched/sched.h:741:44: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/sched.h:742:55: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2429:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct *
   kernel/sched/core.c:2131:38: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/core.c:2131:38: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/core.c:2131:38: sparse:    struct task_struct const *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2452:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2452:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2452:9: sparse:    struct task_struct *
   kernel/sched/sched.h:2452:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2452:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2452:9: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2429:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct *
--
   kernel/sched/fair.c: note: in included file (through arch/xtensa/include/asm/bitops.h, include/linux/bitops.h, include/linux/kernel.h, ...):
   arch/xtensa/include/asm/processor.h:105:2: sparse: sparse: Unsupported xtensa ABI
   arch/xtensa/include/asm/processor.h:135:2: sparse: sparse: Unsupported Xtensa ABI
   kernel/sched/fair.c: note: in included file:
>> kernel/sched/sched.h:741:44: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/sched.h:742:55: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/fair.c:6073:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/fair.c:6073:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/fair.c:6073:22: sparse:    struct task_struct *
   kernel/sched/fair.c:10625:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/fair.c:10625:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/fair.c:10625:22: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2452:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2452:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2452:9: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
--
   kernel/sched/build_policy.c: note: in included file (through arch/xtensa/include/asm/bitops.h, include/linux/bitops.h, include/linux/kernel.h, ...):
   arch/xtensa/include/asm/processor.h:105:2: sparse: sparse: Unsupported xtensa ABI
   arch/xtensa/include/asm/processor.h:135:2: sparse: sparse: Unsupported Xtensa ABI
   kernel/sched/build_policy.c: note: in included file:
>> kernel/sched/sched.h:741:44: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/sched.h:742:55: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/build_policy.c: note: in included file:
   kernel/sched/rt.c:2289:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/rt.c:2289:25: sparse:    struct task_struct *
   kernel/sched/rt.c:2289:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/rt.c:1994:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/rt.c:1994:13: sparse:    struct task_struct *
   kernel/sched/rt.c:1994:13: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/build_policy.c: note: in included file:
   kernel/sched/deadline.c:2675:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/deadline.c:2675:13: sparse:    struct task_struct *
   kernel/sched/deadline.c:2675:13: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/deadline.c:2781:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/deadline.c:2781:25: sparse:    struct task_struct *
   kernel/sched/deadline.c:2781:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/deadline.c:3024:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/deadline.c:3024:23: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/deadline.c:3024:23: sparse:    struct task_struct *
   kernel/sched/build_policy.c: note: in included file:
   kernel/sched/syscalls.c:206:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/syscalls.c:206:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/syscalls.c:206:22: sparse:    struct task_struct *
   kernel/sched/build_policy.c: note: in included file:
   kernel/sched/sched.h:2241:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2241:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2241:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2241:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2241:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2429:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct *
   kernel/sched/sched.h:2252:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2252:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2429:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2429:9: sparse:    struct task_struct *
--
   kernel/sched/build_utility.c: note: in included file (through arch/xtensa/include/asm/bitops.h, include/linux/bitops.h, include/linux/kernel.h, ...):
   arch/xtensa/include/asm/processor.h:105:2: sparse: sparse: Unsupported xtensa ABI
   arch/xtensa/include/asm/processor.h:135:2: sparse: sparse: Unsupported Xtensa ABI
   kernel/sched/build_utility.c: note: in included file:
>> kernel/sched/sched.h:741:44: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/sched.h:742:55: sparse: sparse: dubious one-bit signed bitfield
   kernel/sched/sched.h:2241:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2241:25: sparse:    struct task_struct *

vim +741 kernel/sched/sched.h

   709	
   710	#ifdef CONFIG_FAIR_GROUP_SCHED
   711		struct rq		*rq;	/* CPU runqueue to which this cfs_rq is attached */
   712	
   713		/*
   714		 * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
   715		 * a hierarchy). Non-leaf lrqs hold other higher schedulable entities
   716		 * (like users, containers etc.)
   717		 *
   718		 * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU.
   719		 * This list is used during load balance.
   720		 */
   721		int			on_list;
   722		struct list_head	leaf_cfs_rq_list;
   723		struct task_group	*tg;	/* group that "owns" this runqueue */
   724	
   725		/* Locally cached copy of our task_group's idle value */
   726		int			idle;
   727	
   728	#ifdef CONFIG_CFS_BANDWIDTH
   729		int			runtime_enabled;
   730		s64			runtime_remaining;
   731	
   732		u64			throttled_pelt_idle;
   733	#ifndef CONFIG_64BIT
   734		u64                     throttled_pelt_idle_copy;
   735	#endif
   736		u64			throttled_clock;
   737		u64			throttled_clock_pelt;
   738		u64			throttled_clock_pelt_time;
   739		u64			throttled_clock_self;
   740		u64			throttled_clock_self_time;
 > 741		int			throttled:1;
   742		int			pelt_clock_throttled:1;
   743		int			throttle_count;
   744		struct list_head	throttled_list;
   745		struct list_head	throttled_csd_list;
   746		struct list_head        throttled_limbo_list;
   747	#endif /* CONFIG_CFS_BANDWIDTH */
   748	#endif /* CONFIG_FAIR_GROUP_SCHED */
   749	};
   750	

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https://github.com/intel/lkp-tests/wiki