ipv6: 64bit version of ipv6_addr_v4mapped().

PATCH In review YOSHIFUJI Hideaki 1 participant 1 message Jan 14, 2013

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Networking Network drivers IPv4/IPv6

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YOSHIFUJI Hideaki

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2013-01-14 17:10 UTC #0 lore raw

PATCH 3/6 ipv6: 64bit version of ipv6_addr_v4mapped().

Signed-off-by YOSHIFUJI Hideaki <[email protected]>

---
 include/net/ipv6.h |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

include/net/ipv6.h +7 -2

index c5049b0..77cef332 100644
@@ -487,8 +487,13 @@ static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 
 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 {
-	return (a->s6_addr32[0] | a->s6_addr32[1] |
-		 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
+	return (
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+		*(__be64 *)a |
+#else
+		(a->s6_addr32[0] | a->s6_addr32[1]) |
+#endif
+		(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
 }
 
 /*

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