linux-kernel - [PATCH net-next 5/5] rtnetlink: move type calculation out of loop

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Message-Id: <20180828231859.29758-6-christian@brauner.io>
Date:   Wed, 29 Aug 2018 01:18:59 +0200
From:   Christian Brauner <christian@...uner.io>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        pombredanne@...b.com, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, dsahern@...il.com, fw@...len.de,
        ktkhai@...tuozzo.com, lucien.xin@...il.com,
        jakub.kicinski@...ronome.com, jbenc@...hat.com,
        nicolas.dichtel@...nd.com, Christian Brauner <christian@...uner.io>
Subject: [PATCH net-next 5/5] rtnetlink: move type calculation out of loop

I don't see how the type - which is one of
RTM_{GETADDR,GETROUTE,GETNETCONF} - can change. So do the message type
calculation once before entering the for loop.

Signed-off-by: Christian Brauner <christian@...uner.io>
---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index c6c6f93cd195..a644d392918b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3215,13 +3215,13 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	int idx;
 	int s_idx = cb->family;
+	int type = cb->nlh->nlmsg_type - RTM_BASE;
 
 	if (s_idx == 0)
 		s_idx = 1;
 
 	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
 		struct rtnl_link **tab;
-		int type = cb->nlh->nlmsg_type-RTM_BASE;
 		struct rtnl_link *link;
 		rtnl_dumpit_func dumpit;
 
-- 
2.17.1