[PATCH] debug cgroup: remove unneeded cgroup_lock

[Li Zefan]

Since we are in cgroup write handler, so the cgrp is valid, so we
don't have to hold cgroup_mutex when calling cgroup_task_count().
One similar example is in cgroup_tasks_open().

Signed-off-by: Li Zefan <lizf at cn.fujitsu.com>
---
 kernel/cgroup_debug.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index daca620..0c92d79 100644
--- a/kernel/cgroup_debug.c
+++ b/kernel/cgroup_debug.c
@@ -40,9 +40,7 @@ static u64 taskcount_read(struct cgroup *cont, struct cftype *cft)
 {
 	u64 count;
 
-	cgroup_lock();
 	count = cgroup_task_count(cont);
-	cgroup_unlock();
 	return count;
 }
 
-- 
1.5.4.rc3