Index: kernel/test/synch/rwlock1.c
===================================================================
--- kernel/test/synch/rwlock1.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/rwlock1.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -41,5 +41,5 @@
 static rwlock_t rwlock;
 
-char *test_rwlock1(void)
+const char *test_rwlock1(void)
 {
 	rwlock_initialize(&rwlock);
Index: kernel/test/synch/rwlock2.c
===================================================================
--- kernel/test/synch/rwlock2.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/rwlock2.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -53,5 +53,5 @@
 }
 
-char *test_rwlock2(void)
+const char *test_rwlock2(void)
 {
 	thread_t *thrd;
Index: kernel/test/synch/rwlock3.c
===================================================================
--- kernel/test/synch/rwlock3.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/rwlock3.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -60,5 +60,5 @@
 }
 
-char *test_rwlock3(void)
+const char *test_rwlock3(void)
 {
 	int i;
Index: kernel/test/synch/rwlock4.c
===================================================================
--- kernel/test/synch/rwlock4.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/rwlock4.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -132,5 +132,5 @@
 }
 
-char *test_rwlock4(void)
+const char *test_rwlock4(void)
 {
 	context_t ctx;
Index: kernel/test/synch/rwlock5.c
===================================================================
--- kernel/test/synch/rwlock5.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/rwlock5.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -67,5 +67,5 @@
 }
 
-char *test_rwlock5(void)
+const char *test_rwlock5(void)
 {
 	int i, j, k;
Index: kernel/test/synch/semaphore1.c
===================================================================
--- kernel/test/synch/semaphore1.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/semaphore1.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -70,5 +70,5 @@
 }
 
-char *test_semaphore1(void)
+const char *test_semaphore1(void)
 {
 	int i, j, k;
Index: kernel/test/synch/semaphore2.c
===================================================================
--- kernel/test/synch/semaphore2.c	(revision 228666c006a3414de772f08f77335c546dd21aab)
+++ kernel/test/synch/semaphore2.c	(revision 46843683b55a678b246f7735afcdf24b794d2d8f)
@@ -82,5 +82,5 @@
 }
 
-char *test_semaphore2(void)
+const char *test_semaphore2(void)
 {
 	uint32_t i, k;