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Message-ID: <202512120039.K3b6g8aA-lkp@intel.com>
Date: Fri, 12 Dec 2025 00:10:04 +0800
From: kernel test robot <lkp@...el.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: kernel/sched/rt.c:1656:15: sparse: sparse: dereference of noderef
expression
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d358e5254674b70f34c847715ca509e46eb81e6f
commit: ea100b31eed459ea32d6df4489cf70219fd83a07 sched/smp: Use the SMP version of task_on_cpu()
date: 6 months ago
config: arm-randconfig-r111-20251211 (https://download.01.org/0day-ci/archive/20251212/202512120039.K3b6g8aA-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 6ec8c4351cfc1d0627d1633b02ea787bd29c77d8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251212/202512120039.K3b6g8aA-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/202512120039.K3b6g8aA-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
kernel/sched/deadline.c:2634:23: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2644:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2644:13: sparse: struct task_struct *
kernel/sched/deadline.c:2644:13: sparse: struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2750:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2750:25: sparse: struct task_struct *
kernel/sched/deadline.c:2750:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2278:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:2278:42: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:2278:42: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:2288:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:2288:38: sparse: expected struct task_struct *tsk
kernel/sched/deadline.c:2288:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:1197:39: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:1197:39: sparse: expected struct task_struct *p
kernel/sched/deadline.c:1197:39: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:1197:85: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:1197:85: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:1197:85: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:1295:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:1295:23: sparse: expected struct task_struct *p
kernel/sched/deadline.c:1295:23: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:1604:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:1604:31: sparse: expected struct task_struct *p
kernel/sched/deadline.c:1604:31: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:1604:70: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:1604:70: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:1604:70: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:1693:39: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:1693:39: sparse: expected struct task_struct *donor
kernel/sched/deadline.c:1693:39: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2495:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/deadline.c:2495:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/deadline.c:2495:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/deadline.c:2164:14: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu * @@
kernel/sched/deadline.c:2164:14: sparse: expected struct task_struct *curr
kernel/sched/deadline.c:2164:14: sparse: got struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2165:15: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu * @@
kernel/sched/deadline.c:2165:15: sparse: expected struct task_struct *donor
kernel/sched/deadline.c:2165:15: sparse: got struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2240:43: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:2240:43: sparse: expected struct task_struct *p
kernel/sched/deadline.c:2240:43: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2795:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:2795:38: sparse: expected struct task_struct *tsk
kernel/sched/deadline.c:2795:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:2797:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:2797:23: sparse: expected struct task_struct *p
kernel/sched/deadline.c:2797:23: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2799:44: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:2799:44: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:2799:44: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:2986:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2986:23: sparse: struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2986:23: sparse: struct task_struct *
kernel/sched/deadline.c:3032:32: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
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:2225:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2225:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2225:25: sparse: struct task_struct *
kernel/sched/sched.h:2225:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2225:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2225:25: sparse: struct task_struct *
kernel/sched/sched.h:2236:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2236:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2236:26: sparse: struct task_struct *
kernel/sched/sched.h:2225:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2225:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2225:25: sparse: struct task_struct *
kernel/sched/sched.h:2236:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2236:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2236:26: sparse: struct task_struct *
kernel/sched/sched.h:2225:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2225:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2225:25: sparse: struct task_struct *
kernel/sched/sched.h:2225:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2225:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2225:25: sparse: struct task_struct *
kernel/sched/sched.h:2236:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2236:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2236:26: sparse: struct task_struct *
kernel/sched/sched.h:2236:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2236:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2236:26: sparse: struct task_struct *
kernel/sched/sched.h:2419:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2419:9: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2419:9: sparse: struct task_struct *
kernel/sched/sched.h:2236:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2236:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2236:26: sparse: struct task_struct *
kernel/sched/sched.h:2419:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2419:9: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2419:9: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/syscalls.c:1289:6: sparse: sparse: context imbalance in 'sched_getaffinity' - different lock contexts for basic block
kernel/sched/build_policy.c: note: in included file:
>> kernel/sched/rt.c:1656:15: sparse: sparse: dereference of noderef expression
vim +1656 kernel/sched/rt.c
bb44e5d1c6b3b7 kernel/sched_rt.c Ingo Molnar 2007-07-09 1635
a0e813f26ebcb2 kernel/sched/rt.c Peter Zijlstra 2019-11-08 1636 static inline void set_next_task_rt(struct rq *rq, struct task_struct *p, bool first)
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1637 {
57a5c2dafca8e3 kernel/sched/rt.c Yafang Shao 2021-09-05 1638 struct sched_rt_entity *rt_se = &p->rt;
57a5c2dafca8e3 kernel/sched/rt.c Yafang Shao 2021-09-05 1639 struct rt_rq *rt_rq = &rq->rt;
57a5c2dafca8e3 kernel/sched/rt.c Yafang Shao 2021-09-05 1640
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1641 p->se.exec_start = rq_clock_task(rq);
57a5c2dafca8e3 kernel/sched/rt.c Yafang Shao 2021-09-05 1642 if (on_rt_rq(&p->rt))
57a5c2dafca8e3 kernel/sched/rt.c Yafang Shao 2021-09-05 1643 update_stats_wait_end_rt(rt_rq, rt_se);
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1644
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1645 /* The running task is never eligible for pushing */
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1646 dequeue_pushable_task(rq, p);
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1647
a0e813f26ebcb2 kernel/sched/rt.c Peter Zijlstra 2019-11-08 1648 if (!first)
a0e813f26ebcb2 kernel/sched/rt.c Peter Zijlstra 2019-11-08 1649 return;
a0e813f26ebcb2 kernel/sched/rt.c Peter Zijlstra 2019-11-08 1650
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1651 /*
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1652 * If prev task was rt, put_prev_task() has already updated the
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1653 * utilization. We only care of the case where we start to schedule a
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1654 * rt task
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1655 */
af0c8b2bf67b25 kernel/sched/rt.c Peter Zijlstra 2024-10-09 @1656 if (rq->donor->sched_class != &rt_sched_class)
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1657 update_rt_rq_load_avg(rq_clock_pelt(rq), rq, 0);
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1658
f95d4eaee6d020 kernel/sched/rt.c Peter Zijlstra 2019-05-29 1659 rt_queue_push_tasks(rq);
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1660 }
ff1cdc94de4d33 kernel/sched/rt.c Muchun Song 2018-10-26 1661
:::::: The code at line 1656 was first introduced by commit
:::::: af0c8b2bf67b25756f27644936e74fd9a6273bd2 sched: Split scheduler and execution contexts
:::::: TO: Peter Zijlstra <peterz@...radead.org>
:::::: CC: Peter Zijlstra <peterz@...radead.org>
--
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https://github.com/intel/lkp-tests/wiki
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