cgroup: Fix cgroup_subsys::exit callback

Make the ::exit method act like ::attach, it is after all very nearly
the same thing.

The bug had no effect on correctness - fixing it is an optimization for
the scheduler. Also, later perf-cgroups patches rely on it.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Menage <menage@google.com>
LKML-Reference: <1297160655.13327.92.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 18 insertions, 13 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b24d7027b83c..f6495f33a355 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4230,20 +4230,8 @@ void cgroup_post_fork(struct task_struct *child)
  */
 void cgroup_exit(struct task_struct *tsk, int run_callbacks)
 {
-        int i;
         struct css_set *cg;
-
-        if (run_callbacks && need_forkexit_callback) {
-                /*
-                 * modular subsystems can't use callbacks, so no need to lock
-                 * the subsys array
-                 */
-                for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
-                        struct cgroup_subsys *ss = subsys[i];
-                        if (ss->exit)
-                                ss->exit(ss, tsk);
-                }
-        }
+        int i;
 
         /*
          * Unlink from the css_set task list if necessary.
@@ -4261,7 +4249,24 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
         task_lock(tsk);
         cg = tsk->cgroups;
         tsk->cgroups = &init_css_set;
+
+        if (run_callbacks && need_forkexit_callback) {
+                /*
+                 * modular subsystems can't use callbacks, so no need to lock
+                 * the subsys array
+                 */
+                for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
+                        struct cgroup_subsys *ss = subsys[i];
+                        if (ss->exit) {
+                                struct cgroup *old_cgrp =
+                                        rcu_dereference_raw(cg->subsys[i])->cgroup;
+                                struct cgroup *cgrp = task_cgroup(tsk, i);
+                                ss->exit(ss, cgrp, old_cgrp, tsk);
+                        }
+                }
+        }
         task_unlock(tsk);
+
         if (cg)
                 put_css_set_taskexit(cg);
 }