net/sunrpc/auth.c:725:34: sparse: sparse: incorrect type in initializer (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   861deac3b092f37b2c5e6871732f3e11486f7082
commit: 5e16923b432bfe79fdfb7cd95ed8e63f6438b663 NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred().
date:   5 years ago
config: x86_64-randconfig-x001-20230717 (https://download.01.org/0day-ci/archive/20231225/202312251922.sGIFj35A-lkp@xxxxxxxxx/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/20231225/202312251922.sGIFj35A-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
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312251922.sGIFj35A-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> net/sunrpc/auth.c:725:34: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct cred const *cred @@     got struct cred const [noderef] __rcu *extern [addressable] [toplevel] cred @@
   net/sunrpc/auth.c:725:34: sparse:     expected struct cred const *cred
   net/sunrpc/auth.c:725:34: sparse:     got struct cred const [noderef] __rcu *extern [addressable] [toplevel] cred
   net/sunrpc/auth.c: note: in included file:
   include/linux/slab.h:332:43: sparse: sparse: dubious: x & !y
   include/linux/slab.h:332:43: sparse: sparse: dubious: x & !y

vim +725 net/sunrpc/auth.c

   718	
   719	static struct rpc_cred *
   720	rpcauth_bind_machine_cred(struct rpc_task *task, int lookupflags)
   721	{
   722		struct rpc_auth *auth = task->tk_client->cl_auth;
   723		struct auth_cred acred = {
   724			.principal = task->tk_client->cl_principal,
 > 725			.cred = init_task.cred,
   726		};
   727	
   728		if (!acred.principal)
   729			return NULL;
   730		dprintk("RPC: %5u looking up %s machine cred\n",
   731			task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
   732		return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
   733	}
   734	

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