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>

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 8f22533..5a361f8 100644 (file)
--- 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 e9c856a..5e6d26b 100644 (file)
--- 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 ba6248b..2f4936c 100644 (file)
--- 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);