[SERIAL] Add ALPHA_KLUDGE_MCR from include/linux/serialP.h

drivers/serial/8250.h

@@ -72,3 +72,14 @@ struct serial8250_config {
 #else
 #define SERIAL8250_SHARE_IRQS 0
 #endif
+
+#if defined(__alpha__) && !defined(CONFIG_PCI)
+/*
+ * Digital did something really horribly wrong with the OUT1 and OUT2
+ * lines on at least some ALPHA's.  The failure mode is that if either
+ * is cleared, the machine locks up with endless interrupts.
+ */
+#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
+#else
+#define ALPHA_KLUDGE_MCR 0
+#endif