From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Date: Mon, 14 Jan 2013 07:10:06 +0000 (+0000)
Subject: ipv6: 64bit version of ipv6_addr_loopback().
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e287656b365f8db4486371c76ea54cbdbed7129c;p=linux-beck.git

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 ace1113bef85..c5049b019332 100644
--- 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)