Index: uspace/app/trace/syscalls.c
===================================================================
--- uspace/app/trace/syscalls.c	(revision fe8dfa6849229e829003d0fb83de58148a0aa45d)
+++ uspace/app/trace/syscalls.c	(revision 77429d3ddfaa914b6e45b20d0e839aa7b9d4d505)
@@ -73,5 +73,4 @@
     [SYS_PHYSMEM_MAP] = { "physmem_map",		4,	V_ERRNO },
     [SYS_IOSPACE_ENABLE] = { "iospace_enable",		1,	V_ERRNO },
-    [SYS_INTERRUPT_ENABLE] = { "interrupt_enable",	2,	V_ERRNO },
 
     [SYS_SYSINFO_GET_TAG] = { "sysinfo_get_tag",		2,	V_INTEGER },
Index: uspace/drv/ns8250/ns8250.c
===================================================================
--- uspace/drv/ns8250/ns8250.c	(revision fe8dfa6849229e829003d0fb83de58148a0aa45d)
+++ uspace/drv/ns8250/ns8250.c	(revision 77429d3ddfaa914b6e45b20d0e839aa7b9d4d505)
@@ -431,10 +431,4 @@
 {
 	ns8250_dev_data_t *data = (ns8250_dev_data_t *) dev->driver_data;
-	int res;
-	
-	/* Enable interrupt globally. */
-	res = interrupt_enable(data->irq);
-	if (res != EOK)
-		return res;
 	
 	/* Enable interrupt on the serial port. */
Index: uspace/lib/c/generic/ddi.c
===================================================================
--- uspace/lib/c/generic/ddi.c	(revision fe8dfa6849229e829003d0fb83de58148a0aa45d)
+++ uspace/lib/c/generic/ddi.c	(revision 77429d3ddfaa914b6e45b20d0e839aa7b9d4d505)
@@ -96,26 +96,4 @@
 }
 
-/** Enable an interrupt.
- * 
- * @param irq the interrupt.
- * 
- * @return Zero on success, negative error code otherwise. 
- */
-int interrupt_enable(int irq) 
-{
-	return __SYSCALL2(SYS_INTERRUPT_ENABLE, (sysarg_t) irq, 1);
-}
-
-/** Disable an interrupt.
- * 
- * @param irq the interrupt.
- * 
- * @return Zero on success, negative error code otherwise. 
- */
-int interrupt_disable(int irq) 
-{
-	return __SYSCALL2(SYS_INTERRUPT_ENABLE, (sysarg_t) irq, 0);
-}
-
 /** Enable PIO for specified I/O range.
  *
Index: uspace/lib/c/include/ddi.h
===================================================================
--- uspace/lib/c/include/ddi.h	(revision fe8dfa6849229e829003d0fb83de58148a0aa45d)
+++ uspace/lib/c/include/ddi.h	(revision 77429d3ddfaa914b6e45b20d0e839aa7b9d4d505)
@@ -42,6 +42,4 @@
 extern int iospace_enable(task_id_t, void *, unsigned long);
 extern int pio_enable(void *, size_t, void **);
-extern int interrupt_enable(int);
-extern int interrupt_disable(int);
 
 #endif