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authorLi Zefan <lizf@cn.fujitsu.com>2008-10-29 14:00:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-30 11:38:45 -0700
commit00c2e63c31d0f431952ff2a671c5c6997dd4f8b2 (patch)
tree2277b400fef79e55c13d7045aa63d5bed9ad5883
parent80a6a2cf3bebcf20285cf05373b9c5ec96816577 (diff)
downloadop-kernel-dev-00c2e63c31d0f431952ff2a671c5c6997dd4f8b2.zip
op-kernel-dev-00c2e63c31d0f431952ff2a671c5c6997dd4f8b2.tar.gz
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>
-rw-r--r--include/linux/freezer.h5
-rw-r--r--kernel/cgroup_freezer.c15
-rw-r--r--kernel/freezer.c20
3 files changed, 14 insertions, 26 deletions
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 8f22533..5a361f8 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 e9c856a..5e6d26b 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 ba6248b..2f4936c 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);
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