you are changing `thread_stack_init` for native and arm, but there are more:
```
cpu/msp430-common/cpu.c:char *thread_stack_init(void (*task_func)(void), void *stack_start, int stack_size)
cpu/lpc1768/atom.c:char * thread_stack_init(void * task_func, void * stack_start, int stack_size ) {
```
what about the others?