39     struct process_control_block *tsk = NULL;  in do_fork()  local
42     tsk = (struct process_control_block *)kzalloc(STACK_SIZE, 0);  in do_fork()
45     if (tsk == NULL)  in do_fork()
52     memset(tsk, 0, sizeof(struct process_control_block));  in do_fork()
55     memcpy(tsk, current_pcb, sizeof(struct process_control_block));  in do_fork()
56     tsk->worker_private = NULL;  in do_fork()
60     list_init(&tsk->list);  in do_fork()
65         tsk->flags |= PF_KFORK;  in do_fork()
67     if (tsk->flags & PF_KTHREAD)  in do_fork()
70         retval = kthread_set_worker_private(tsk);  in do_fork()
73         tsk->virtual_runtime = 0;  in do_fork()
75     tsk->priority = 2;  in do_fork()
76     tsk->preempt_count = 0;  in do_fork()
80     tsk->pid = process_global_pid++;  in do_fork()
84     tsk->prev_pcb = &initial_proc_union.pcb;  in do_fork()
86     tsk->next_pcb = initial_proc_union.pcb.next_pcb;  in do_fork()
88     initial_proc_union.pcb.next_pcb = tsk;  in do_fork()
90     tsk->parent_pcb = current_pcb;  in do_fork()
95     tsk->cpu_id = proc_current_cpu_id;  in do_fork()
96     tsk->state = PROC_UNINTERRUPTIBLE;  in do_fork()
98     tsk->parent_pcb = current_pcb;  in do_fork()
99     wait_queue_init(&tsk->wait_child_proc_exit, NULL);  in do_fork()
101     list_init(&tsk->list);  in do_fork()
106     retval = process_copy_flags(clone_flags, tsk);  in do_fork()
111     retval = process_copy_mm(clone_flags, tsk);  in do_fork()
116     retval = process_copy_files(clone_flags, tsk);  in do_fork()
121     retval = process_copy_sighand(clone_flags, tsk);  in do_fork()
125     retval = process_copy_signal(clone_flags, tsk);  in do_fork()
130     retval = process_copy_thread(clone_flags, tsk, stack_start, stack_size, regs);  in do_fork()
135     retval = tsk->pid;  in do_fork()
137     tsk->flags &= ~PF_KFORK;  in do_fork()
140     rs_procfs_register_pid(tsk->pid);  in do_fork()
143     process_wakeup(tsk);  in do_fork()
149     process_exit_thread(tsk);  in do_fork()
152     process_exit_files(tsk);  in do_fork()
153     rs_procfs_unregister_pid(tsk->pid);  in do_fork()
155     process_exit_sighand(tsk);  in do_fork()
157     process_exit_signal(tsk);  in do_fork()
160     process_exit_mm(tsk);  in do_fork()
162     kfree(tsk);  in do_fork()