class: add lockdep infrastructure

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

diff --git a/kernel/pid.c b/kernel/pid.c
index a9ae9f7fb229fd5b34d6d963d080f5c047714708..30bd5d4b2ac7b7f2f822ba2b69d2726395974df6 100644 (file)
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/init.h>
+#include <linux/rculist.h>
 #include <linux/bootmem.h>
 #include <linux/hash.h>
 #include <linux/pid_namespace.h>
@@ -317,7 +318,7 @@ 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 +326,10 @@ 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 +339,7 @@ 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]))
@@ -348,13 +348,24 @@ 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)
 {
        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 *pid_task(struct pid *pid, enum pid_type type)