netns: constify net_hash_mix() and various callers

const qualifiers ease code review by making clear
which objects are not written in a function.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/udp.h

@@ -34,7 +34,7 @@ static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
 
 #define UDP_HTABLE_SIZE_MIN		(CONFIG_BASE_SMALL ? 128 : 256)
 
-static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
+static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask)
 {
 	return (num + net_hash_mix(net)) & mask;
 }

include/net/inet_hashtables.h

@@ -221,8 +221,8 @@ inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
 void inet_bind_bucket_destroy(struct kmem_cache *cachep,
 			      struct inet_bind_bucket *tb);
 
-static inline int inet_bhashfn(struct net *net, const __u16 lport,
-			       const int bhash_size)
+static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
+			       const u32 bhash_size)
 {
 	return (lport + net_hash_mix(net)) & (bhash_size - 1);
 }
@@ -231,7 +231,7 @@ void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
 		    const unsigned short snum);
 
 /* These can have wildcards, don't try too hard. */
-static inline int inet_lhashfn(struct net *net, const unsigned short num)
+static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
 {
 	return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
 }

include/net/netns/hash.h

@@ -5,7 +5,7 @@
 
 struct net;
 
-static inline unsigned int net_hash_mix(struct net *net)
+static inline u32 net_hash_mix(const struct net *net)
 {
 #ifdef CONFIG_NET_NS
 	/*
@@ -13,7 +13,7 @@ static inline unsigned int net_hash_mix(struct net *net)
 	 * always zeroed
 	 */
 
-	return (unsigned)(((unsigned long)net) >> L1_CACHE_SHIFT);
+	return (u32)(((unsigned long)net) >> L1_CACHE_SHIFT);
 #else
 	return 0;
 #endif

net/ipv4/devinet.c

@@ -107,7 +107,7 @@ static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
 
 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
 
-static u32 inet_addr_hash(struct net *net, __be32 addr)
+static u32 inet_addr_hash(const struct net *net, __be32 addr)
 {
 	u32 val = (__force u32) addr ^ net_hash_mix(net);
 

net/ipv4/inet_hashtables.c

@@ -24,7 +24,7 @@
 #include <net/secure_seq.h>
 #include <net/ip.h>
 
-static unsigned int inet_ehashfn(struct net *net, const __be32 laddr,
+static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
 			const __u16 lport, const __be32 faddr,
 			const __be16 fport)
 {

net/ipv4/ping.c

@@ -64,11 +64,11 @@ EXPORT_SYMBOL_GPL(pingv6_ops);
 
 static u16 ping_port_rover;
 
-static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
+static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask)
 {
-	int res = (num + net_hash_mix(net)) & mask;
+	u32 res = (num + net_hash_mix(net)) & mask;
 
-	pr_debug("hash(%d) = %d\n", num, res);
+	pr_debug("hash(%u) = %u\n", num, res);
 	return res;
 }
 EXPORT_SYMBOL_GPL(ping_hash);

net/ipv4/udp.c

@@ -318,7 +318,7 @@ static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
 		   inet1->inet_rcv_saddr == inet2->inet_rcv_saddr));
 }
 
-static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr,
+static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr,
 			      unsigned int port)
 {
 	return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
@@ -421,7 +421,7 @@ static inline int compute_score2(struct sock *sk, struct net *net,
 	return score;
 }
 
-static unsigned int udp_ehashfn(struct net *net, const __be32 laddr,
+static u32 udp_ehashfn(const struct net *net, const __be32 laddr,
 		       const __u16 lport, const __be32 faddr,
 		       const __be16 fport)
 {

net/ipv6/inet6_hashtables.c

@@ -23,7 +23,7 @@
 #include <net/secure_seq.h>
 #include <net/ip.h>
 
-static unsigned int inet6_ehashfn(struct net *net,
+static u32 inet6_ehashfn(const struct net *net,
 			 const struct in6_addr *laddr,
 			 const u16 lport,
 			 const struct in6_addr *faddr,

net/ipv6/udp.c

@@ -53,7 +53,7 @@
 #include <trace/events/skb.h>
 #include "udp_impl.h"
 
-static unsigned int udp6_ehashfn(struct net *net,
+static u32 udp6_ehashfn(const struct net *net,
 			const struct in6_addr *laddr,
 			const u16 lport,
 			const struct in6_addr *faddr,
@@ -104,7 +104,7 @@ int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
 	return 0;
 }
 
-static unsigned int udp6_portaddr_hash(struct net *net,
+static u32 udp6_portaddr_hash(const struct net *net,
 			      const struct in6_addr *addr6,
 			      unsigned int port)
 {