extern int proc_readdir(struct file *, void *, filldir_t);
extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
extern int proc_readdir(struct file *, void *, filldir_t);
extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
-extern const struct file_operations proc_kcore_operations;
-extern const struct file_operations proc_kmsg_operations;
-extern const struct file_operations ppc_htab_operations;
+extern struct file_operations proc_kcore_operations;
+extern struct file_operations proc_kmsg_operations;
+extern struct file_operations ppc_htab_operations;