Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index e5686be..9287eb6 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * linux/fs/nfs/namespace.c
  *
@@ -221,10 +222,10 @@
 
 /**
  * nfs_do_submount - set up mountpoint when crossing a filesystem boundary
- * @dentry - parent directory
- * @fh - filehandle for new root dentry
- * @fattr - attributes for new root inode
- * @authflavor - security flavor to use when performing the mount
+ * @dentry: parent directory
+ * @fh: filehandle for new root dentry
+ * @fattr: attributes for new root inode
+ * @authflavor: security flavor to use when performing the mount
  *
  */
 struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,