freezer_cg: use thaw_process() in unfreeze_cgroup()

Don't duplicate the implementation of thaw_process().

[akpm@linux-foundation.org: make __thaw_process() static]
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Acked-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 14 insertions, 26 deletions

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 8f225339eee9..5a361f85cfec 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -44,11 +44,6 @@ static inline bool should_send_signal(struct task_struct *p)
         return !(p->flags & PF_FREEZER_NOSIG);
 }
 
-/*
- * Wake up a frozen process
- */
-extern int __thaw_process(struct task_struct *p);
-
 /* Takes and releases task alloc lock using task_lock() */
 extern int thaw_process(struct task_struct *p);
 
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index e9c856a265c9..5e6d26b66e88 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -275,25 +275,18 @@ static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
         return num_cant_freeze_now ? -EBUSY : 0;
 }
 
-static int unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
+static void unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
 {
         struct cgroup_iter it;
         struct task_struct *task;
 
         cgroup_iter_start(cgroup, &it);
         while ((task = cgroup_iter_next(cgroup, &it))) {
-                int do_wake;
-
-                task_lock(task);
-                do_wake = __thaw_process(task);
-                task_unlock(task);
-                if (do_wake)
-                        wake_up_process(task);
+                thaw_process(task);
         }
         cgroup_iter_end(cgroup, &it);
-        freezer->state = CGROUP_THAWED;
 
-        return 0;
+        freezer->state = CGROUP_THAWED;
 }
 
 static int freezer_change_state(struct cgroup *cgroup,
@@ -320,7 +313,7 @@ static int freezer_change_state(struct cgroup *cgroup,
                 }
                 /* state == FREEZING and goal_state == THAWED, so unfreeze */
         case CGROUP_FROZEN:
-                retval = unfreeze_cgroup(cgroup, freezer);
+                unfreeze_cgroup(cgroup, freezer);
                 break;
         default:
                 break;
diff --git a/kernel/freezer.c b/kernel/freezer.c
index ba6248b323ef..2f4936cf7083 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -121,16 +121,7 @@ void cancel_freezing(struct task_struct *p)
         }
 }
 
-/*
- * Wake up a frozen process
- *
- * task_lock() is needed to prevent the race with refrigerator() which may
- * occur if the freezing of tasks fails.  Namely, without the lock, if the
- * freezing of tasks failed, thaw_tasks() might have run before a task in
- * refrigerator() could call frozen_process(), in which case the task would be
- * frozen and no one would thaw it.
- */
-int __thaw_process(struct task_struct *p)
+static int __thaw_process(struct task_struct *p)
 {
         if (frozen(p)) {
                 p->flags &= ~PF_FROZEN;
@@ -140,6 +131,15 @@ int __thaw_process(struct task_struct *p)
         return 0;
 }
 
+/*
+ * Wake up a frozen process
+ *
+ * task_lock() is needed to prevent the race with refrigerator() which may
+ * occur if the freezing of tasks fails.  Namely, without the lock, if the
+ * freezing of tasks failed, thaw_tasks() might have run before a task in
+ * refrigerator() could call frozen_process(), in which case the task would be
+ * frozen and no one would thaw it.
+ */
 int thaw_process(struct task_struct *p)
 {
         task_lock(p);