[song:fanotify-bpf 1/3] fs/notify/fanotify/fanotify.c:1062:63: sparse: sparse: incorrect type in argument 1 (different address spaces)

[song:fanotify-bpf 1/3] fs/notify/fanotify/fanotify.c:1062:63: sparse: sparse: incorrect type in argument 1 (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/song/linux.git fanotify-bpf
head:   d2202d928a9b4a190058b1bc4731b72477a10c8e
commit: 85c87cab4c9c2ffa4a9d2b00525a75576f50c550 [1/3] fanotify: Introduce fanotify filter
config: nios2-randconfig-r133-20260506 (https://download.01.org/0day-ci/archive/20260506/202605061408.WGETFhTu-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260506/202605061408.WGETFhTu-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/202605061408.WGETFhTu-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/notify/fanotify/fanotify.c:1062:63: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct fanotify_filter_hook *filter_hook @@     got struct fanotify_filter_hook [noderef] __rcu *filter_hook @@
   fs/notify/fanotify/fanotify.c:1062:63: sparse:     expected struct fanotify_filter_hook *filter_hook
   fs/notify/fanotify/fanotify.c:1062:63: sparse:     got struct fanotify_filter_hook [noderef] __rcu *filter_hook

vim +1062 fs/notify/fanotify/fanotify.c

  1048	
  1049	static void fanotify_free_group_priv(struct fsnotify_group *group)
  1050	{
  1051		put_user_ns(group->user_ns);
  1052		kfree(group->fanotify_data.merge_hash);
  1053		if (group->fanotify_data.ucounts)
  1054			dec_ucount(group->fanotify_data.ucounts,
  1055				   UCOUNT_FANOTIFY_GROUPS);
  1056	
  1057		if (mempool_initialized(&group->fanotify_data.error_events_pool))
  1058			mempool_exit(&group->fanotify_data.error_events_pool);
  1059	
  1060	#ifdef CONFIG_FANOTIFY_FILTER
  1061		if (group->fanotify_data.filter_hook)
> 1062			fanotify_filter_hook_free(group->fanotify_data.filter_hook);
  1063	#endif
  1064	}
  1065	

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