int copy_thread()

in kernel/process.c [108:129]

• 19 lines of code
• 2 McCabe index (conditional complexity)

int copy_thread(unsigned long clone_flags, unsigned long usp,
		unsigned long topstk, struct task_struct *p, unsigned long tls)
{
	struct pt_regs *childregs;

	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;

	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
		memset(childregs, 0, sizeof(struct pt_regs));
		childregs->retpc = (unsigned long) ret_from_kernel_thread;
		childregs->er4 = topstk; /* arg */
		childregs->er5 = usp; /* fn */
	}  else {
		*childregs = *current_pt_regs();
		childregs->er0 = 0;
		childregs->retpc = (unsigned long) ret_from_fork;
		p->thread.usp = usp ?: rdusp();
	}
	p->thread.ksp = (unsigned long)childregs;

	return 0;
}