[brauner-vfs:vfs.misc 10/12] fs/file.c:922:24: sparse: sparse: incorrect type in return expression (different address spaces)

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.misc
head:   2c814c8fad597e079cf3e526bf9b7a2572da0091
commit: f5dc7c8f516455fc4b88a36e4bfd9c45c5823404 [10/12] file: convert to SLAB_TYPESAFE_BY_RCU
config: i386-randconfig-061-20231008 (https://download.01.org/0day-ci/archive/20231010/202310100108.itAyBdia-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231010/202310100108.itAyBdia-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/202310100108.itAyBdia-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   fs/file.c:379:17: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file **old_fds @@     got struct file [noderef] __rcu **fd @@
   fs/file.c:379:17: sparse:     expected struct file **old_fds
   fs/file.c:379:17: sparse:     got struct file [noderef] __rcu **fd
   fs/file.c:380:17: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file **new_fds @@     got struct file [noderef] __rcu **fd @@
   fs/file.c:380:17: sparse:     expected struct file **new_fds
   fs/file.c:380:17: sparse:     got struct file [noderef] __rcu **fd
   fs/file.c:395:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/file.c:395:17: sparse:    struct file [noderef] __rcu *
   fs/file.c:395:17: sparse:    struct file *
   fs/file.c:430:54: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct file *file @@     got struct file [noderef] __rcu *[assigned] __ret @@
   fs/file.c:470:28: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct fdtable [noderef] __rcu *fdt @@     got struct fdtable * @@
   fs/file.c:646:14: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file *file @@     got struct file [noderef] __rcu * @@
   fs/file.c:841:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file *file @@     got struct file [noderef] __rcu * @@
   fs/file.c:862:14: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file [noderef] __rcu *file @@     got struct file * @@
   fs/file.c:866:13: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct atomic_t [usertype] *v @@     got struct atomic_t [noderef] __rcu * @@
   fs/file.c:869:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file [noderef] __rcu *file_reloaded @@     got struct file * @@
   fs/file.c:892:24: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected struct file * @@     got struct file [noderef] __rcu *file_reloaded @@
   fs/file.c:894:14: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct file * @@     got struct file [noderef] __rcu *file @@
   fs/file.c:915:22: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file [noderef] __rcu *file @@     got struct file * @@
>> fs/file.c:922:24: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected struct file * @@     got struct file [noderef] __rcu *file @@
   fs/file.c:1212:16: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct file *tofree @@     got struct file [noderef] __rcu * @@

vim +922 fs/file.c

   897	
   898	/**
   899	 * get_file_rcu - try go get a reference to a file under rcu
   900	 * @f: the file to get a reference on
   901	 *
   902	 * This function tries to get a reference on @f carefully verifying that
   903	 * @f hasn't been reused.
   904	 *
   905	 * This function should rarely have to be used and only by users who
   906	 * understand the implications of SLAB_TYPESAFE_BY_RCU. Try to avoid it.
   907	 *
   908	 * Return: Returns @f with the reference count increased or NULL.
   909	 */
   910	struct file *get_file_rcu(struct file __rcu **f)
   911	{
   912		for (;;) {
   913			struct file __rcu *file;
   914	
   915			file = __get_file_rcu(f);
   916			if (unlikely(!file))
   917				return NULL;
   918	
   919			if (unlikely(IS_ERR(file)))
   920				continue;
   921	
 > 922			return file;
   923		}
   924	}
   925	EXPORT_SYMBOL_GPL(get_file_rcu);
   926	

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