From: Yajun Deng <yajun.deng@linux.dev>
Date: Sat, 18 Sep 2021 06:36:07 +0000 (+0800)
Subject: net: rtnetlink: convert rcu_assign_pointer to RCU_INIT_POINTER
X-Git-Tag: v6.1-rc5~2768^2~408
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4fc29989835ab7379f807854b5f7338b752b9f1a;p=platform%2Fkernel%2Flinux-starfive.git

net: rtnetlink: convert rcu_assign_pointer to RCU_INIT_POINTER

It no need barrier when assigning a NULL value to an RCU protected
pointer. So use RCU_INIT_POINTER() instead for more fast.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 972c8cb..327ca6b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -301,7 +301,7 @@ int rtnl_unregister(int protocol, int msgtype)
 	}
 
 	link = rtnl_dereference(tab[msgindex]);
-	rcu_assign_pointer(tab[msgindex], NULL);
+	RCU_INIT_POINTER(tab[msgindex], NULL);
 	rtnl_unlock();
 
 	kfree_rcu(link, rcu);
@@ -337,7 +337,7 @@ void rtnl_unregister_all(int protocol)
 		if (!link)
 			continue;
 
-		rcu_assign_pointer(tab[msgindex], NULL);
+		RCU_INIT_POINTER(tab[msgindex], NULL);
 		kfree_rcu(link, rcu);
 	}
 	rtnl_unlock();