From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Date: Mon, 14 Jan 2013 07:10:14 +0000 (+0000)
Subject: ipv6: 64bit version of ipv6_addr_v4mapped().
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a04d40b8956010d2a6a7abc9254792c8f8649242;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ipv6: 64bit version of ipv6_addr_v4mapped().

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 c5049b019332..77cef3321571 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -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;
 }
 
 /*