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Message-ID: <202506272222.ohKcICfH-lkp@intel.com>
Date: Fri, 27 Jun 2025 22:38:45 +0800
From: kernel test robot <lkp@...el.com>
To: Tejun Heo <tj@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Andrea Righi <arighi@...dia.com>
Subject: kernel/sched/ext_idle.c:736:33: sparse: sparse: incorrect type in
initializer (different address spaces)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 67a993863163cb88b1b68974c31b0d84ece4293e
commit: d310fb40096896abe1928b88224129bf7122532f sched_ext: Clean up scx_root usages
date: 6 weeks ago
config: powerpc64-randconfig-r113-20250627 (https://download.01.org/0day-ci/archive/20250627/202506272222.ohKcICfH-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 13.3.0
reproduce: (https://download.01.org/0day-ci/archive/20250627/202506272222.ohKcICfH-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/202506272222.ohKcICfH-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
kernel/sched/ext.c:3339:38: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *prev @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/ext.c:3339:38: sparse: expected struct task_struct *prev
kernel/sched/ext.c:3339:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/ext.c:3394:49: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3394:49: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3394:49: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3451:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3451:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3451:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3510:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3510:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3510:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3529:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3529:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3529:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3641:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3641:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3641:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3720:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3720:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3720:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3772:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3772:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3772:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3799:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3799:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3799:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3812:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3812:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3812:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3941:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3941:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3941:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:3956:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root @@
kernel/sched/ext.c:3956:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:3956:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
kernel/sched/ext.c:5057:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root @@
kernel/sched/ext.c:5057:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:5057:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root
kernel/sched/ext.c:5099:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root @@
kernel/sched/ext.c:5099:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:5099:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root
kernel/sched/ext.c:5209:52: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/ext.c:5209:52: sparse: expected struct task_struct *p
kernel/sched/ext.c:5209:52: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/ext.c:5971:32: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct const *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/ext.c:5971:32: sparse: expected struct task_struct const *p
kernel/sched/ext.c:5971:32: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/ext.c:6080:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root @@
kernel/sched/ext.c:6080:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:6080:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root
kernel/sched/ext.c:6352:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root @@
kernel/sched/ext.c:6352:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:6352:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root
kernel/sched/ext.c:6485:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root @@
kernel/sched/ext.c:6485:33: sparse: expected struct scx_sched *sch
kernel/sched/ext.c:6485:33: sparse: got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root
kernel/sched/ext.c:7332:33: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext.c:7332:33: sparse: struct task_struct [noderef] __rcu *
kernel/sched/ext.c:7332:33: sparse: struct task_struct const *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/ext_idle.c:245:24: sparse: sparse: Using plain integer as NULL pointer
>> kernel/sched/ext_idle.c:736:33: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct scx_sched *sch @@ got struct scx_sched [noderef] __rcu *static [addressable] [assigned] [toplevel] scx_root @@
kernel/sched/ext_idle.c:766:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct const *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: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: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: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: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:2441:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2441:9: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2441:9: 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:2441:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2441:9: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2441:9: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/syscalls.c:1295:6: 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:1697:15: sparse: sparse: dereference of noderef expression
vim +736 kernel/sched/ext_idle.c
717
718 /*
719 * Update the idle state of a CPU to @idle.
720 *
721 * If @do_notify is true, ops.update_idle() is invoked to notify the scx
722 * scheduler of an actual idle state transition (idle to busy or vice
723 * versa). If @do_notify is false, only the idle state in the idle masks is
724 * refreshed without invoking ops.update_idle().
725 *
726 * This distinction is necessary, because an idle CPU can be "reserved" and
727 * awakened via scx_bpf_pick_idle_cpu() + scx_bpf_kick_cpu(), marking it as
728 * busy even if no tasks are dispatched. In this case, the CPU may return
729 * to idle without a true state transition. Refreshing the idle masks
730 * without invoking ops.update_idle() ensures accurate idle state tracking
731 * while avoiding unnecessary updates and maintaining balanced state
732 * transitions.
733 */
734 void __scx_update_idle(struct rq *rq, bool idle, bool do_notify)
735 {
> 736 struct scx_sched *sch = scx_root;
737 int cpu = cpu_of(rq);
738
739 lockdep_assert_rq_held(rq);
740
741 /*
742 * Trigger ops.update_idle() only when transitioning from a task to
743 * the idle thread and vice versa.
744 *
745 * Idle transitions are indicated by do_notify being set to true,
746 * managed by put_prev_task_idle()/set_next_task_idle().
747 */
748 if (SCX_HAS_OP(sch, update_idle) && do_notify && !scx_rq_bypassing(rq))
749 SCX_CALL_OP(SCX_KF_REST, update_idle, rq, cpu_of(rq), idle);
750
751 /*
752 * Update the idle masks:
753 * - for real idle transitions (do_notify == true)
754 * - for idle-to-idle transitions (indicated by the previous task
755 * being the idle thread, managed by pick_task_idle())
756 *
757 * Skip updating idle masks if the previous task is not the idle
758 * thread, since set_next_task_idle() has already handled it when
759 * transitioning from a task to the idle thread (calling this
760 * function with do_notify == true).
761 *
762 * In this way we can avoid updating the idle masks twice,
763 * unnecessarily.
764 */
765 if (static_branch_likely(&scx_builtin_idle_enabled))
766 if (do_notify || is_idle_task(rq->curr))
767 update_builtin_idle(cpu, idle);
768 }
769
--
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