linux-kernel - Re: [PATCH net-next] net: remove redundant variable in vxlan_xmit

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Date:   Fri, 21 Aug 2020 11:41:15 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     Jianlin.Lv@....com
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: remove redundant variable in
 vxlan_xmit_one

From: Jianlin Lv <Jianlin.Lv@....com>
Date: Fri, 21 Aug 2020 13:56:36 +0800

> @@ -2614,8 +2613,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
>  	info = skb_tunnel_info(skb);
>  
>  	if (rdst) {
> -		dst = &rdst->remote_ip;
> -		if (vxlan_addr_any(dst)) {
> +		remote_ip = rdst->remote_ip;
> +		if (vxlan_addr_any(&remote_ip)) {
>  			if (did_rsc) {

Now we are making a copy of the remote_ip object on the stack, and
passing a reference to the stack copy to the vxlan_addr_any()
function.  The existing code is passing a reference to the
original object, no copies.

This is not an improvement.