unsigned long __get_wchan()

in kernel/process.c [133:152]

• 18 lines of code
• 5 McCabe index (conditional complexity)

unsigned long __get_wchan(struct task_struct *p)
{
	unsigned long fp, pc;
	unsigned long stack_page;
	int count = 0;

	stack_page = (unsigned long)task_stack_page(p);
	fp = ((struct hexagon_switch_stack *)p->thread.switch_sp)->fp;
	do {
		if (fp < (stack_page + sizeof(struct thread_info)) ||
			fp >= (THREAD_SIZE - 8 + stack_page))
			return 0;
		pc = ((unsigned long *)fp)[1];
		if (!in_sched_functions(pc))
			return pc;
		fp = *(unsigned long *) fp;
	} while (count++ < 16);

	return 0;
}