[PATCH net-next] 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 <redacted>
---
 net/core/rtnetlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 972c8cb303a5..327ca6bc6e6d 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();

-- 
2.32.0

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Sat, 18 Sep 2021 14:36:07 +0800 you wrote:

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 <redacted>
---
 net/core/rtnetlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Here is the summary with links:
  - [net-next] net: rtnetlink: convert rcu_assign_pointer to RCU_INIT_POINTER
    https://git.kernel.org/netdev/net-next/c/4fc29989835a

You are awesome, thank you!
--
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On 9/17/21 11:36 PM, Yajun Deng wrote:

FYI, there is no memory barrier involved in 

rcu_assign_pointer(tab[msgindex], NULL);

This has been the case for the last 5 years.

Your patch was not needed really.