--- zzzz-none-000/linux-2.6.39.4/drivers/tty/serial/serial_core.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-arm-6490-729/linux-2.6.39.4/drivers/tty/serial/serial_core.c	2021-11-10 13:23:10.000000000 +0000
@@ -1633,6 +1633,7 @@
 	char stat_buf[32];
 	unsigned int status;
 	int mmio;
+    int j;
 
 	if (!uport)
 		return;
@@ -1700,6 +1701,14 @@
 		seq_puts(m, stat_buf);
 	}
 	seq_putc(m, '\n');
+    seq_printf(m, "Rx histogram (num of bytes read from fifo): \n");
+    if (uport->irq == 8)
+    {
+        for (j=0;j<16;j++)
+        {
+            seq_printf(m,"%d bytes: %d\n",j+1,uport->histogram_RX_stats[j]);
+        }
+    }
 #undef STATBIT
 #undef INFOBIT
 }
@@ -1929,7 +1938,7 @@
 	struct tty_port *port = &state->port;
 	struct device *tty_dev;
 	struct uart_match match = {uport, drv};
-	struct tty_struct *tty;
+	struct tty_struct *tty __maybe_unused;
 
 	mutex_lock(&port->mutex);