cpusets, hotplug: Implement cpuset tree traversal in a helper function

[cascardo/linux.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 31a32c7..f00e319 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -304,12 +304,17 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
        }
 
        err = arch_dup_task_struct(tsk, orig);
-       if (err)
-               goto out;
 
+       /*
+        * We defer looking at err, because we will need this setup
+        * for the clean up path to work correctly.
+        */
        tsk->stack = ti;
-
        setup_thread_stack(tsk, orig);
+
+       if (err)
+               goto out;
+
        clear_user_return_notifier(tsk);
        clear_tsk_need_resched(tsk);
        stackend = end_of_stack(tsk);
@@ -787,9 +792,6 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
        /* Get rid of any cached register state */
        deactivate_mm(tsk, mm);
 
-       if (tsk->vfork_done)
-               complete_vfork_done(tsk);
-
        /*
         * If we're exiting normally, clear a user-space tid field if
         * requested.  We leave this alone when dying by signal, to leave
@@ -810,6 +812,13 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
                }
                tsk->clear_child_tid = NULL;
        }
+
+       /*
+        * All done, finally we can wake up parent and return this mm to him.
+        * Also kthread_stop() uses this completion for synchronization.
+        */
+       if (tsk->vfork_done)
+               complete_vfork_done(tsk);
 }
 
 /*
@@ -1411,6 +1420,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         */
        p->group_leader = p;
        INIT_LIST_HEAD(&p->thread_group);
+       INIT_HLIST_HEAD(&p->task_works);
 
        /* Now that the task is set up, run cgroup callbacks if
         * necessary. We need to run them before the task is visible