57 ….state = PROC_UNINTERRUPTIBLE, .flags = PF_KTHREAD, .preempt_count = 0, .signal = 0, .cpu_id = 0, …
359     if (current_pcb->flags & PF_VFORK)  in do_execve()
384     if (!(current_pcb->flags & PF_KTHREAD))  in do_execve()
402     current_pcb->flags &= ~PF_VFORK;  in do_execve()
509     current_pcb->flags &= (~PF_KTHREAD);  in initial_kernel_thread()
510     kdebug("in initial_kernel_thread: flags=%ld", current_pcb->flags);  in initial_kernel_thread()
514     current_pcb->flags = 0;  in initial_kernel_thread()
573 pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)  in kernel_thread()  argument
602     return do_fork(&regs, flags | CLONE_VM, 0, 0);  in kernel_thread()
703     current_pcb->flags |= PF_NEED_SCHED;  in process_wakeup_immediately()
715     if (!(pcb->flags & PF_VFORK))  in process_exit_files()
737     if (pcb->flags & CLONE_VM)  in process_exit_mm()
811     if ((pcb->flags & PF_KTHREAD)) // 释放内核线程的worker private结构体  in process_release_pcb()