Merge branch 'mpls-cleanups'

Benjamin Poirier says:

====================
net: mpls: Cleanup nexthop iterator macros

The mpls macros for_nexthops and change_nexthops were probably copied
from decnet or ipv4 but they grew a superfluous variable and lost a
beneficial "const".
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mpls/af_mpls.c

@@ -230,8 +230,8 @@ static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
  * Since those fields can change at any moment, use READ_ONCE to
  * access both.
  */
-static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
-					     struct sk_buff *skb)
+static const struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
+						   struct sk_buff *skb)
 {
 	u32 hash = 0;
 	int nh_index = 0;
@@ -343,8 +343,8 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
 {
 	struct net *net = dev_net(dev);
 	struct mpls_shim_hdr *hdr;
+	const struct mpls_nh *nh;
 	struct mpls_route *rt;
-	struct mpls_nh *nh;
 	struct mpls_entry_decoded dec;
 	struct net_device *out_dev;
 	struct mpls_dev *out_mdev;
@@ -2333,12 +2333,12 @@ static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
 	u32 labels[MAX_NEW_LABELS];
 	struct mpls_shim_hdr *hdr;
 	unsigned int hdr_size = 0;
+	const struct mpls_nh *nh;
 	struct net_device *dev;
 	struct mpls_route *rt;
 	struct rtmsg *rtm, *r;
 	struct nlmsghdr *nlh;
 	struct sk_buff *skb;
-	struct mpls_nh *nh;
 	u8 n_labels;
 	int err;
 

net/mpls/internal.h

@@ -158,17 +158,16 @@ struct mpls_route { /* next hop label forwarding entry */
 };
 
 #define for_nexthops(rt) {						\
-	int nhsel; struct mpls_nh *nh;  u8 *__nh;			\
-	for (nhsel = 0, nh = (rt)->rt_nh, __nh = (u8 *)((rt)->rt_nh);	\
+	int nhsel; const struct mpls_nh *nh;				\
+	for (nhsel = 0, nh = (rt)->rt_nh;				\
 	     nhsel < (rt)->rt_nhn;					\
-	     __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++)
+	     nh = (void *)nh + (rt)->rt_nh_size, nhsel++)
 
 #define change_nexthops(rt) {						\
-	int nhsel; struct mpls_nh *nh; u8 *__nh;			\
-	for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh),		\
-			__nh = (u8 *)((rt)->rt_nh);			\
+	int nhsel; struct mpls_nh *nh;					\
+	for (nhsel = 0, nh = (rt)->rt_nh;				\
 	     nhsel < (rt)->rt_nhn;					\
-	     __nh += rt->rt_nh_size, nh = (struct mpls_nh *)__nh, nhsel++)
+	     nh = (void *)nh + (rt)->rt_nh_size, nhsel++)
 
 #define endfor_nexthops(rt) }