1 files changed, 9 insertions, 3 deletions

diff --git a/kernel/pid.c b/kernel/pid.c
index 93e212f20671..8387e8c68193 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -223,9 +223,6 @@ int fastcall attach_pid(struct task_struct *task, enum pid_type type, int nr)
         struct pid_link *link;
         struct pid *pid;
 
-        WARN_ON(!task->pid); /* to be removed soon */
-        WARN_ON(!nr); /* to be removed soon */
-
         link = &task->pids[type];
         link->pid = pid = find_pid(nr);
         hlist_add_head_rcu(&link->node, &pid->tasks[type]);
@@ -252,6 +249,15 @@ void fastcall detach_pid(struct task_struct *task, enum pid_type type)
         free_pid(pid);
 }
 
+/* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */
+void fastcall transfer_pid(struct task_struct *old, struct task_struct *new,
+                           enum pid_type type)
+{
+        new->pids[type].pid = old->pids[type].pid;
+        hlist_replace_rcu(&old->pids[type].node, &new->pids[type].node);
+        old->pids[type].pid = NULL;
+}
+
 struct task_struct * fastcall pid_task(struct pid *pid, enum pid_type type)
 {
         struct task_struct *result = NULL;