[opencloudos:linux-5.4/next 24605/27507] fs/ceph/mds_client.c:792:80: sparse: sparse: incorrect type in argument 1 (different address spaces)

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

tree:   https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git linux-5.4/next
head:   fdd5d0bfc620bd5147ff5b260822c7645aeddad6
commit: 266b6cc05219d4424d5ae0d42beca427c560210c [24605/27507] ceph: add mds request pid info into debugfs
config: x86_64-randconfig-122-20240312 (https://download.01.org/0day-ci/archive/20240313/202403131733.kh82730S-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/20240313/202403131733.kh82730S-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/202403131733.kh82730S-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/ceph/mds_client.c:792:80: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct task_struct *tsk @@     got struct task_struct [noderef] __rcu *parent @@
   fs/ceph/mds_client.c:792:80: sparse:     expected struct task_struct *tsk
   fs/ceph/mds_client.c:792:80: sparse:     got struct task_struct [noderef] __rcu *parent

vim +792 fs/ceph/mds_client.c

   760	
   761	/*
   762	 * Register an in-flight request, and assign a tid.  Link to directory
   763	 * are modifying (if any).
   764	 *
   765	 * Called under mdsc->mutex.
   766	 */
   767	static void __register_request(struct ceph_mds_client *mdsc,
   768				       struct ceph_mds_request *req,
   769				       struct inode *dir)
   770	{
   771		int ret = 0;
   772	
   773		req->r_tid = ++mdsc->last_tid;
   774		if (req->r_num_caps) {
   775			ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
   776						req->r_num_caps);
   777			if (ret < 0) {
   778				pr_err("__register_request %p "
   779				       "failed to reserve caps: %d\n", req, ret);
   780				/* set req->r_err to fail early from __do_request */
   781				req->r_err = ret;
   782				return;
   783			}
   784		}
   785		dout("__register_request %p tid %lld\n", req, req->r_tid);
   786		ceph_mdsc_get_request(req);
   787		insert_request(&mdsc->request_tree, req);
   788	
   789		req->r_uid = current_fsuid();
   790		req->r_gid = current_fsgid();
   791		if (pid_alive(current)) {
 > 792			req->r_pid = task_pid_nr_ns(current, task_active_pid_ns(current->parent));
   793		} else {
   794			req->r_pid = -1;
   795		}
   796	
   797		if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
   798			mdsc->oldest_tid = req->r_tid;
   799	
   800		if (dir) {
   801			ihold(dir);
   802			req->r_unsafe_dir = dir;
   803		}
   804	}
   805	

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