linux-kernel - [PATCH 1/2] decnet: dn_rtmsg: constify nf_hook

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Message-Id: <1501310455-7896-2-git-send-email-Julia.Lawall@lip6.fr>
Date:   Sat, 29 Jul 2017 08:40:53 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     bhumirks@...il.com, kernel-janitors@...r.kernel.org,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-decnet-user@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] decnet: dn_rtmsg: constify nf_hook_ops structures

The nf_hook_ops structure is only passed as the second argument to
nf_register_net_hook or nf_unregister_net_hook, both of which are
declared as const.  Thus the nf_hook_ops structure itself can be
const.

Done with the help of Coccinelle.

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct nf_hook_ops i@p = { ... };

@ok1@
identifier r.i;
expression e;
position p;
@@
 \(nf_register_net_hook\|nf_unregister_net_hook\)(e,&i@p)

@bad@
position p != {r.p,ok1.p};
identifier r.i;
struct nf_hook_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct nf_hook_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 net/decnet/netfilter/dn_rtmsg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
index aa8ffec..ab395e5 100644
--- a/net/decnet/netfilter/dn_rtmsg.c
+++ b/net/decnet/netfilter/dn_rtmsg.c
@@ -115,7 +115,7 @@ static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
 	RCV_SKB_FAIL(-EINVAL);
 }
 
-static struct nf_hook_ops dnrmg_ops __read_mostly = {
+static const struct nf_hook_ops dnrmg_ops = {
 	.hook		= dnrmg_hook,
 	.pf		= NFPROTO_DECNET,
 	.hooknum	= NF_DN_ROUTE,