diff --git a/include/linux/pid.h b/include/linux/pid.h
index ed7b1f731923..97b745ddece5 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -88,11 +88,9 @@ extern struct task_struct *get_pid_task(struct pid *pid, enum pid_type);
 extern struct pid *get_task_pid(struct task_struct *task, enum pid_type type);
 
 /*
- * attach_pid() and detach_pid() must be called with the tasklist_lock
- * write-held.
+ * these helpers must be called with the tasklist_lock write-held.
  */
-extern void attach_pid(struct task_struct *task, enum pid_type type,
-			struct pid *pid);
+extern void attach_pid(struct task_struct *task, enum pid_type);
 extern void detach_pid(struct task_struct *task, enum pid_type);
 extern void change_pid(struct task_struct *task, enum pid_type,
 			struct pid *pid);
diff --git a/kernel/fork.c b/kernel/fork.c
index 35f7bb404ceb..0729325d28d7 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1188,6 +1188,12 @@ static void posix_cpu_timers_init(struct task_struct *tsk)
 	INIT_LIST_HEAD(&tsk->cpu_timers[2]);
 }
 
+static inline void
+init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
+{
+	 task->pids[type].pid = pid;
+}
+
 /*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.
@@ -1536,7 +1542,11 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	if (likely(p->pid)) {
 		ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
 
+		init_task_pid(p, PIDTYPE_PID, pid);
 		if (thread_group_leader(p)) {
+			init_task_pid(p, PIDTYPE_PGID, task_pgrp(current));
+			init_task_pid(p, PIDTYPE_SID, task_session(current));
+
 			if (is_child_reaper(pid)) {
 				ns_of_pid(pid)->child_reaper = p;
 				p->signal->flags |= SIGNAL_UNKILLABLE;
@@ -1544,10 +1554,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
 			p->signal->leader_pid = pid;
 			p->signal->tty = tty_kref_get(current->signal->tty);
-			attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
-			attach_pid(p, PIDTYPE_SID, task_session(current));
 			list_add_tail(&p->sibling, &p->real_parent->children);
 			list_add_tail_rcu(&p->tasks, &init_task.tasks);
+			attach_pid(p, PIDTYPE_PGID);
+			attach_pid(p, PIDTYPE_SID);
 			__this_cpu_inc(process_counts);
 		} else {
 			current->signal->nr_threads++;
@@ -1558,7 +1568,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 			list_add_tail_rcu(&p->thread_node,
 					  &p->signal->thread_head);
 		}
-		attach_pid(p, PIDTYPE_PID, pid);
+		attach_pid(p, PIDTYPE_PID);
 		nr_threads++;
 	}
 
diff --git a/kernel/pid.c b/kernel/pid.c
index 013b77ccef8c..c5c118d37334 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -382,14 +382,10 @@ EXPORT_SYMBOL_GPL(find_vpid);
 /*
  * attach_pid() must be called with the tasklist_lock write-held.
  */
-void attach_pid(struct task_struct *task, enum pid_type type,
-		struct pid *pid)
+void attach_pid(struct task_struct *task, enum pid_type type)
 {
-	struct pid_link *link;
-
-	link = &task->pids[type];
-	link->pid = pid;
-	hlist_add_head_rcu(&link->node, &pid->tasks[type]);
+	struct pid_link *link = &task->pids[type];
+	hlist_add_head_rcu(&link->node, &link->pid->tasks[type]);
 }
 
 static void __change_pid(struct task_struct *task, enum pid_type type,
@@ -421,7 +417,7 @@ void change_pid(struct task_struct *task, enum pid_type type,
 		struct pid *pid)
 {
 	__change_pid(task, type, pid);
-	attach_pid(task, type, pid);
+	attach_pid(task, type);
 }
 
 /* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */