From d969fbe69e07fcceb0558b35d4c75eb046041c5e Mon Sep 17 00:00:00 2001
From: Li Zefan <lizf@cn.fujitsu.com>
Date: Thu, 2 Apr 2009 16:57:31 -0700
Subject: [PATCH] debug cgroup: remove unneeded cgroup_lock
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@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/cgroup_debug.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index daca6209202df..0c92d797baa6d 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;
}
--
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