netdev - [PATCH nf-next] netfilter: Clean up unnecessary #ifdef

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Message-Id: <4362209712369ea47ac39b06a9fc93fc4ce3a25c.1574247376.git.lukas@wunner.de>
Date:   Wed, 20 Nov 2019 12:33:59 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     "Pablo Neira Ayuso" <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH nf-next] netfilter: Clean up unnecessary #ifdef

If CONFIG_NETFILTER_INGRESS is not enabled, nf_ingress() becomes a no-op
because it solely contains an if-clause calling nf_hook_ingress_active(),
for which an empty inline stub exists in <linux/netfilter_ingress.h>.

All the symbols used in the if-clause's body are still available even if
CONFIG_NETFILTER_INGRESS is not enabled.

The additional "#ifdef CONFIG_NETFILTER_INGRESS" in nf_ingress() is thus
unnecessary, so drop it.

Signed-off-by: Lukas Wunner <lukas@...ner.de>
Cc: Daniel Borkmann <daniel@...earbox.net>
---
Resending this patch without RFC tag on Pablo's request since it's just
an uncontroversial cleanup.

Previous submission:
https://lore.kernel.org/netfilter-devel/ba3cc38580d4cb43aa5599524ec5e5205d6dfa77.1572528496.git.lukas@wunner.de/

 net/core/dev.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index da78a433c10c..330c6d21cc1c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4932,7 +4932,6 @@ static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
 			     int *ret, struct net_device *orig_dev)
 {
-#ifdef CONFIG_NETFILTER_INGRESS
 	if (nf_hook_ingress_active(skb)) {
 		int ingress_retval;
 
@@ -4946,7 +4945,6 @@ static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
 		rcu_read_unlock();
 		return ingress_retval;
 	}
-#endif /* CONFIG_NETFILTER_INGRESS */
 	return 0;
 }
 
-- 
2.24.0