[koverstreet-bcachefs:trace_sched_wakeup_backtrace 140/332] fs/bcachefs/data/copygc.c:581:34: sparse: sparse: incorrect type in assignment (different address spaces)

[koverstreet-bcachefs:trace_sched_wakeup_backtrace 140/332] fs/bcachefs/data/copygc.c:581:34: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot]

tree:   https://github.com/koverstreet/bcachefs trace_sched_wakeup_backtrace
head:   9e7cbd4ad9c7a7ba461dbba9185628c006e200cd
commit: 88633d63152451a41ce7b7913e49ac6d6107c314 [140/332] bcachefs: Allocator now directly wakes up copygc when necessary
config: openrisc-randconfig-r112-20260915 (https://download.01.org/0day-ci/archive/20260916/202609161357.3wdof49W-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 15.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260916/202609161357.3wdof49W-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609161357.3wdof49W-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/bcachefs/data/copygc.c:581:34: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct task_struct [noderef] __rcu *thread @@     got struct task_struct *t @@
   fs/bcachefs/data/copygc.c:581:34: sparse:     expected struct task_struct [noderef] __rcu *thread
   fs/bcachefs/data/copygc.c:581:34: sparse:     got struct task_struct *t
>> fs/bcachefs/data/copygc.c:583:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct task_struct *tsk @@     got struct task_struct [noderef] __rcu *thread @@
   fs/bcachefs/data/copygc.c:583:42: sparse:     expected struct task_struct *tsk
   fs/bcachefs/data/copygc.c:583:42: sparse:     got struct task_struct [noderef] __rcu *thread

vim +581 fs/bcachefs/data/copygc.c

1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  557  
e6d1161530bcd63 fs/bcachefs/movinggc.c    Kent Overstreet 2020-07-11  558  int bch2_copygc_start(struct bch_fs *c)
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  559  {
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  560  	if (c->opts.nochanges)
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  561  		return 0;
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  562  
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  563  	if (bch2_fs_init_fault("copygc_start"))
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  564  		return -ENOMEM;
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  565  
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  566  	if (!c->copygc.wq &&
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  567  	    !(c->copygc.wq = alloc_workqueue("bcachefs_copygc",
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  568  				WQ_HIGHPRI|WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)))
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  569  		return bch_err_throw(c, ENOMEM_fs_other_alloc);
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  570  
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  571  	if (!c->copygc.thread) {
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  572  		struct task_struct *t =
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  573  			kthread_create(bch2_copygc_thread, c, "bch-copygc/%s", c->name);
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  574  		int ret = PTR_ERR_OR_ZERO(t);
e46c181af9e230c fs/bcachefs/movinggc.c    Kent Overstreet 2023-09-11  575  		bch_err_msg(c, ret, "creating copygc thread");
cf904c8d964fa47 fs/bcachefs/movinggc.c    Kent Overstreet 2023-12-16  576  		if (ret)
d4bf5eecd78a90d fs/bcachefs/movinggc.c    Kent Overstreet 2022-07-18  577  			return ret;
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  578  
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  579  		get_task_struct(t);
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  580  
cb70f3a81f829a0 fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29 @581  		c->copygc.thread = t;
88633d63152451a fs/bcachefs/data/copygc.c Kent Overstreet 2024-10-18  582  		rcu_assign_pointer(c->copygc.thread, t);
cb70f3a81f829a0 fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29 @583  		wake_up_process(c->copygc.thread);
7705b3d5de918bd fs/bcachefs/data/copygc.c Kent Overstreet 2025-11-29  584  	}
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  585  
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  586  	return 0;
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  587  }
1c6fdbd8f2465dd fs/bcachefs/movinggc.c    Kent Overstreet 2017-03-16  588  

:::::: The code at line 581 was first introduced by commit
:::::: cb70f3a81f829a0b9217057bb638905881dc02c1 bcachefs: struct bch_fs_ec, bch_fs_copygc

:::::: TO: Kent Overstreet <kent.overstreet@linux.dev>
:::::: CC: Kent Overstreet <kent.overstreet@linux.dev>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki