netdev - [PATCH net-next] net: sock: do not set sk_cookie in sk_clone

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Message-Id: <1547719310-1007-1-git-send-email-laoar.shao@gmail.com>
Date:   Thu, 17 Jan 2019 18:01:50 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     davem@...emloft.net, edumazet@...gle.com
Cc:     netdev@...r.kernel.org, shaoyafang@...iglobal.com,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH net-next] net: sock: do not set sk_cookie in sk_clone_lock()

The only call site of sk_clone_lock is in inet_csk_clone_lock,
and sk_cookie will be set there.
So we don't need to set sk_cookie in sk_clone_lock().
That can save an atomic operation.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
---
 net/core/sock.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index f00902c..21e2a84 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1726,7 +1726,6 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 		newsk->sk_err_soft = 0;
 		newsk->sk_priority = 0;
 		newsk->sk_incoming_cpu = raw_smp_processor_id();
-		atomic64_set(&newsk->sk_cookie, 0);
 		if (likely(newsk->sk_net_refcnt))
 			sock_inuse_add(sock_net(newsk), 1);
 
-- 
1.8.3.1