ipv6: 64bit version of ipv6_addr_loopback().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index ace1113bef85ea51c4551716b2269cbad4e33bb8..c5049b01933201fe4eb8a33aca675bc5504cb2ab 100644 (file)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -475,8 +475,14 @@ static inline u32 ipv6_addr_hash(const struct in6_addr *a)
 
 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 {
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+       const unsigned long *ul = (const unsigned long *)a;
+
+       return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
+#else
        return (a->s6_addr32[0] | a->s6_addr32[1] |
                a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
+#endif
 }
 
 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)