X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fpid.c;h=20d59fa2d493c7a20b83ff151745e38a847e0366;hb=f36b7a2c170ff1dbbb38d235817e04020b196950;hp=e9a31d362b2805f30cc4cb5ef67a6fe0ec14ee3d;hpb=65450cebc6a2efde80ed45514f727e6e4dc1eafd;p=linux-2.6

diff --git a/kernel/pid.c b/kernel/pid.c
index e9a31d362b..20d59fa2d4 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -317,7 +317,7 @@ EXPORT_SYMBOL_GPL(find_pid);
 /*
  * attach_pid() must be called with the tasklist_lock write-held.
  */
-int attach_pid(struct task_struct *task, enum pid_type type,
+void attach_pid(struct task_struct *task, enum pid_type type,
 		struct pid *pid)
 {
 	struct pid_link *link;
@@ -325,11 +325,10 @@ int attach_pid(struct task_struct *task, enum pid_type type,
 	link = &task->pids[type];
 	link->pid = pid;
 	hlist_add_head_rcu(&link->node, &pid->tasks[type]);
-
-	return 0;
 }
 
-void detach_pid(struct task_struct *task, enum pid_type type)
+static void __change_pid(struct task_struct *task, enum pid_type type,
+			struct pid *new)
 {
 	struct pid_link *link;
 	struct pid *pid;
@@ -339,7 +338,7 @@ void detach_pid(struct task_struct *task, enum pid_type type)
 	pid = link->pid;
 
 	hlist_del_rcu(&link->node);
-	link->pid = NULL;
+	link->pid = new;
 
 	for (tmp = PIDTYPE_MAX; --tmp >= 0; )
 		if (!hlist_empty(&pid->tasks[tmp]))
@@ -348,6 +347,18 @@ void detach_pid(struct task_struct *task, enum pid_type type)
 	free_pid(pid);
 }
 
+void detach_pid(struct task_struct *task, enum pid_type type)
+{
+	__change_pid(task, type, NULL);
+}
+
+void change_pid(struct task_struct *task, enum pid_type type,
+		struct pid *pid)
+{
+	__change_pid(task, type, pid);
+	attach_pid(task, type, pid);
+}
+
 /* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */
 void transfer_pid(struct task_struct *old, struct task_struct *new,
 			   enum pid_type type)