+static int hello_show(struct seq_file *file, void *data)
+{
+ seq_puts(file, "Hello, world!\n");
+ return 0;
+}
+
+#if 0
+static void * hello_start(struct seq_file *file, loff_t *pos)
+{
+ return NULL;
+}
+
+static void hello_stop(struct seq_file *file, void *data)
+{
+}
+
+static void * hello_next(struct seq_file *file, void *data, loff_t *pos)
+{
+ return NULL;
+}
+
+static const struct seq_operations hello_seqops =
+{
+ .start = hello_start,
+ .stop = hello_stop,
+ .next = hello_next,
+ .show = hello_show,
+};
+#endif
+
+static int hello_procfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hello_show, NULL);
+}
+
+static const struct file_operations hello_procfs_fops =
+{
+ .open = hello_procfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+