[amir73il:pdirops 12/19] fs/overlayfs/dir.c:582:13: sparse: sparse: incompatible types in comparison expression (different address spaces):

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

tree:   https://github.com/amir73il/linux pdirops
head:   3c4028c13414cb58cd674b839b8faec6afbcad51
commit: b1f61c4156d084ae5f2532f87fd31e1bb74579cf [12/19] ovl: add prepare_creds_ovl cleanup guard
config: powerpc-randconfig-r123-20251115 (https://download.01.org/0day-ci/archive/20251115/202511152248.uA0YA4CD-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251115/202511152248.uA0YA4CD-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/202511152248.uA0YA4CD-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/overlayfs/dir.c:582:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/overlayfs/dir.c:582:13: sparse:    struct cred const [noderef] __rcu *
   fs/overlayfs/dir.c:582:13: sparse:    struct cred const *

vim +582 fs/overlayfs/dir.c

   577	
   578	static const struct cred *ovl_prepare_creds(struct dentry *dentry, struct inode *inode, umode_t mode)
   579	{
   580		int err;
   581	
 > 582		if (WARN_ON_ONCE(current->cred != ovl_creds(dentry->d_sb)))
   583			return ERR_PTR(-EINVAL);
   584	
   585		CLASS(prepare_creds, override_cred)();
   586		if (!override_cred)
   587			return ERR_PTR(-ENOMEM);
   588	
   589		override_cred->fsuid = inode->i_uid;
   590		override_cred->fsgid = inode->i_gid;
   591	
   592		err = security_dentry_create_files_as(dentry, mode, &dentry->d_name,
   593						      current->cred, override_cred);
   594		if (err)
   595			return ERR_PTR(err);
   596	
   597		return override_creds(no_free_ptr(override_cred));
   598	}
   599	

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