kernel/sched/ext.c:3898:50: sparse: sparse: incorrect type in initializer (different address spaces)

[kernel test robot]

Hi Tejun,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3aae9383f42f687221c011d7ee87529398e826b3
commit: 987e00035c0e68bc0d44dec811cc9c26310b5bff sched_ext: Rename pnt_seq to kick_sync
date:   5 months ago
config: sparc-randconfig-r134-20260404 (https://download.01.org/0day-ci/archive/20260405/202604051621.G8CWy2bc-lkp@xxxxxxxxx/config)
compiler: sparc-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260405/202604051621.G8CWy2bc-lkp@xxxxxxxxx/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
| Fixes: 987e00035c0e ("sched_ext: Rename pnt_seq to kick_sync")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604051621.G8CWy2bc-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
   kernel/sched/ext.c:872:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *curr @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/ext.c:1022:56: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:1022:56: sparse:    struct task_struct *
   kernel/sched/ext.c:1022:56: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/ext.c:1047:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:1047:66: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/ext.c:1047:66: sparse:    struct task_struct *
   kernel/sched/ext.c:1237:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:1237:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:1237:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:1355:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:1355:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:1355:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:1402:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:1402:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:1402:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:1451:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:1451:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:1451:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:1495:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:1495:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:1495:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:1496:35: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *p @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/ext.c:1496:35: sparse:     expected struct task_struct *p
   kernel/sched/ext.c:1496:35: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/ext.c:1506:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:1506:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:1506:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:1507:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *from @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/ext.c:1507:38: sparse:     expected struct task_struct *from
   kernel/sched/ext.c:1507:38: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/ext.c:2061:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:2061:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2061:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:2204:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:2204:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2204:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:2260:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:2260:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2260:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:2301:33: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_sched *sch @@     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root @@
   kernel/sched/ext.c:2301:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2301:33: sparse:     got struct scx_sched [noderef] __rcu *static [toplevel] scx_root
   kernel/sched/ext.c:2355:38: 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:2355:38: sparse:     expected struct task_struct *prev
   kernel/sched/ext.c:2355:38: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/ext.c:2468:33: 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:2468:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2468:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2529:33: 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:2529:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2529:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2548:33: 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:2548:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2548:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2670:33: 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:2670:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2670:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2749:33: 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:2749:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2749:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2802:33: 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:2802:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2802:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2830:33: 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:2830:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2830:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2843:33: 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:2843:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2843:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2973:33: 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:2973:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2973:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:2989:33: 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:2989:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:2989:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3057:33: 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:3057:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3057:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3086:33: 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:3086:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3086:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3099:33: 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:3099:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3099:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3148:33: 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:3148:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3148:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3167:33: 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:3167:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3167:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3185:33: 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:3185:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3185:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3201:33: 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:3201:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3201:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
   kernel/sched/ext.c:3218:33: 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:3218:33: sparse:     expected struct scx_sched *sch
   kernel/sched/ext.c:3218:33: sparse:     got struct scx_sched [noderef] __rcu *static [addressable] [toplevel] scx_root
>> kernel/sched/ext.c:3898:50: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_kick_syncs **ksyncs @@     got struct scx_kick_syncs [noderef] __rcu ** @@
   kernel/sched/ext.c:3898:50: sparse:     expected struct scx_kick_syncs **ksyncs
   kernel/sched/ext.c:3898:50: sparse:     got struct scx_kick_syncs [noderef] __rcu **
   kernel/sched/ext.c:3901:27: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:3901:27: sparse:    struct scx_kick_syncs [noderef] __rcu *
   kernel/sched/ext.c:3901:27: sparse:    struct scx_kick_syncs *
   kernel/sched/ext.c:3901:27: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:3901:27: sparse:    struct scx_kick_syncs [noderef] __rcu *
   kernel/sched/ext.c:3901:27: sparse:    struct scx_kick_syncs *
   kernel/sched/ext.c:4182:33: 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:4225:33: 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:4336:52: 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:4413:50: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct scx_kick_syncs **ksyncs @@     got struct scx_kick_syncs [noderef] __rcu ** @@
   kernel/sched/ext.c:4416:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:4416:17: sparse:    struct scx_kick_syncs [noderef] __rcu *
   kernel/sched/ext.c:4416:17: sparse:    struct scx_kick_syncs *
   kernel/sched/ext.c:4425:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:4425:17: sparse:    struct scx_kick_syncs [noderef] __rcu *
   kernel/sched/ext.c:4425:17: sparse:    struct scx_kick_syncs *
   kernel/sched/ext.c:5119:32: 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:5246:33: 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:5573:33: 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:6537:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:6537:15: sparse:    struct scx_sched [noderef] __rcu *
   kernel/sched/ext.c:6537:15: sparse:    struct scx_sched *
   kernel/sched/ext.c:6632:33: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/ext.c:6632:33: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/ext.c:6632:33: sparse:    struct task_struct const *
   kernel/sched/build_policy.c: note: in included file:
   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:756:49: 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:185:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/syscalls.c:185:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/syscalls.c:185:22: sparse:    struct task_struct *
   kernel/sched/build_policy.c: note: in included file:
   kernel/sched/sched.h:2281:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2281:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2281:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2281:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2281:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2281:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2292:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2292:26: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2292:26: sparse:    struct task_struct *
   kernel/sched/sched.h:2281:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2281:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2281:25: sparse:    struct task_struct *

vim +3898 kernel/sched/ext.c

  3892	
  3893	static void free_kick_syncs(void)
  3894	{
  3895		int cpu;
  3896	
  3897		for_each_possible_cpu(cpu) {
> 3898			struct scx_kick_syncs **ksyncs = per_cpu_ptr(&scx_kick_syncs, cpu);
  3899			struct scx_kick_syncs *to_free;
  3900	
  3901			to_free = rcu_replace_pointer(*ksyncs, NULL, true);
  3902			if (to_free)
  3903				call_rcu(&to_free->rcu, free_kick_syncs_rcu);
  3904		}
  3905	}
  3906	

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