[PATCH] copy_process: cosmetic ->ioprio tweak

[linux-2.6-omap-h63xx.git] / kernel / pid.c

diff --git a/kernel/pid.c b/kernel/pid.c
index 93e212f20671fd3b19838327366c45e3ad54ced8..8387e8c681938a968ae005f52c58fcdf11ab17c3 100644 (file)
--- 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;