[PATCH 6/6] cls_cgroup: remove redundant rcu_read_lock/unlock

[Li Zefan <lizf@cn.fujitsu.com>]

We've already used rcu_read_lock/unlock inside task_classid(),
so don't use the lock/unlock pair twice in this hot path.

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

diff --git a/net/core/sock.c b/net/core/sock.c
index 213c856..c0bab23 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1160,9 +1160,7 @@ void sock_update_classid(struct sock *sk)
 {
 	u32 classid;
 
-	rcu_read_lock();  /* doing current task, which cannot vanish. */
 	classid = task_cls_classid(current);
-	rcu_read_unlock();
 	if (classid && classid != sk->sk_classid)
 		sk->sk_classid = classid;
 }
-- 
1.7.3.1