static void notrace walk_stackframe()

in kernel/stacktrace.c [61:89]

• 25 lines of code
• 8 McCabe index (conditional complexity)

static void notrace walk_stackframe(struct task_struct *task,
	struct pt_regs *regs, bool (*fn)(unsigned long, void *), void *arg)
{
	unsigned long sp, pc;
	unsigned long *ksp;

	if (regs) {
		sp = user_stack_pointer(regs);
		pc = instruction_pointer(regs);
	} else if (task == NULL || task == current) {
		const register unsigned long current_sp __asm__ ("sp");
		sp = current_sp;
		pc = (unsigned long)walk_stackframe;
	} else {
		/* task blocked in __switch_to */
		sp = thread_saved_sp(task);
		pc = thread_saved_lr(task);
	}

	if (unlikely(sp & 0x3))
		return;

	ksp = (unsigned long *)sp;
	while (!kstack_end(ksp)) {
		if (__kernel_text_address(pc) && unlikely(fn(pc, arg)))
			break;
		pc = (*ksp++) - 0x4;
	}
}