Index: kernel/generic/src/ddi/ddi.c
===================================================================
--- kernel/generic/src/ddi/ddi.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/ddi/ddi.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -348,5 +348,5 @@
 	ddi_ioarg_t arg;
 	errno_t rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
@@ -359,5 +359,5 @@
 	ddi_ioarg_t arg;
 	errno_t rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 
Index: kernel/generic/src/ipc/ops/datawrite.c
===================================================================
--- kernel/generic/src/ipc/ops/datawrite.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/ipc/ops/datawrite.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -58,5 +58,5 @@
 	call->buffer = (uint8_t *) malloc(size, 0);
 	errno_t rc = copy_from_uspace(call->buffer, (void *) src, size);
-	if (rc != 0) {
+	if (rc != EOK) {
 		/*
 		 * call->buffer will be cleaned up in ipc_call_free() at the
Index: kernel/generic/src/ipc/sysipc.c
===================================================================
--- kernel/generic/src/ipc/sysipc.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/ipc/sysipc.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -424,5 +424,5 @@
 	errno_t rc = copy_from_uspace(&call->data.args, &data->args,
 	    sizeof(call->data.args));
-	if (rc != 0) {
+	if (rc != EOK) {
 		kobject_put(call->kobject);
 		kobject_put(kobj);
@@ -607,5 +607,5 @@
 	errno_t rc = copy_from_uspace(&newdata.args, &data->args,
 	    sizeof(newdata.args));
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
@@ -697,5 +697,5 @@
 	errno_t rc = copy_from_uspace(&call->data.args, &data->args, 
 	    sizeof(call->data.args));
-	if (rc != 0) {
+	if (rc != EOK) {
 		/*
 		 * Republish the capability so that the call does not get lost.
Index: kernel/generic/src/proc/program.c
===================================================================
--- kernel/generic/src/proc/program.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/proc/program.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -233,5 +233,5 @@
 	char namebuf[TASK_NAME_BUFLEN];
 	errno_t rc = copy_from_uspace(namebuf, uspace_name, name_len);
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
@@ -241,5 +241,5 @@
 	program_t prg;
 	rc = program_create_loader(&prg, namebuf);
-	if (rc != 0)
+	if (rc != EOK)
 		return rc;
 	
Index: kernel/generic/src/proc/task.c
===================================================================
--- kernel/generic/src/proc/task.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/proc/task.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -394,5 +394,5 @@
 	
 	errno_t rc = copy_from_uspace(namebuf, uspace_name, name_len);
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
@@ -430,5 +430,5 @@
 	task_id_t taskid;
 	errno_t rc = copy_from_uspace(&taskid, uspace_taskid, sizeof(taskid));
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
Index: kernel/generic/src/proc/thread.c
===================================================================
--- kernel/generic/src/proc/thread.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/proc/thread.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -938,5 +938,5 @@
 	char namebuf[THREAD_NAME_BUFLEN];
 	errno_t rc = copy_from_uspace(namebuf, uspace_name, name_len);
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
@@ -951,5 +951,5 @@
 	
 	rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
-	if (rc != 0) {
+	if (rc != EOK) {
 		free(kernel_uarg);
 		return (sys_errno_t) rc;
@@ -962,5 +962,5 @@
 			rc = copy_to_uspace(uspace_thread_id, &thread->tid,
 			    sizeof(thread->tid));
-			if (rc != 0) {
+			if (rc != EOK) {
 				/*
 				 * We have encountered a failure, but the thread
Index: kernel/generic/src/security/perm.c
===================================================================
--- kernel/generic/src/security/perm.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/security/perm.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -162,5 +162,5 @@
 	sysarg64_t taskid;
 	errno_t rc = copy_from_uspace(&taskid, uspace_taskid, sizeof(sysarg64_t));
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
@@ -183,5 +183,5 @@
 	sysarg64_t taskid;
 	errno_t rc = copy_from_uspace(&taskid, uspace_taskid, sizeof(sysarg64_t));
-	if (rc != 0)
+	if (rc != EOK)
 		return (sys_errno_t) rc;
 	
Index: kernel/generic/src/udebug/udebug_ops.c
===================================================================
--- kernel/generic/src/udebug/udebug_ops.c	(revision b7fd2a02e4161f4edd38548e7f8456b8021549be)
+++ kernel/generic/src/udebug/udebug_ops.c	(revision a53ed3a8097360ccf174e8d94fb407db919eb66a)
@@ -556,5 +556,5 @@
 	mutex_unlock(&TASK->udebug.lock);
 	
-	if (rc != 0)
+	if (rc != EOK)
 		return rc;