Subject: [PATCH net-next 4/5] ipv6: Optimize ipv6_addr_is_ll_all_{nodes,routers}().

From: YOSHIFUJI Hideaki <[email-masked]>
Date: Mon, 21 Jan 2013 02:38:52 +0900

Signed-off-by: YOSHIFUJI Hideaki <[email-masked]>
---
 include/net/addrconf.h |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 9dc5efc..6c58d50 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -288,16 +288,26 @@ static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 
 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 {
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+	__u64 *p = (__u64 *)addr;
+	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
+#else
 	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 		addr->s6_addr32[1] | addr->s6_addr32[2] |
 		(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
+#endif
 }
 
 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 {
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+	__u64 *p = (__u64 *)addr;
+	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
+#else
 	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 		addr->s6_addr32[1] | addr->s6_addr32[2] |
 		(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
+#endif
 }
 
 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
-- 
1.7.9.5