static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
{
	return (
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
		*(unsigned long *)a |
#else
		(__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
#endif
		(__force unsigned long)(a->s6_addr32[2] ^
					cpu_to_be32(0x0000ffff))) == 0UL;
}
static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
{
	return (
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
		*(unsigned long *)a |
#else
		(__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
#endif
		(__force unsigned long)(a->s6_addr32[2] ^
					cpu_to_be32(0x0000ffff))) == 0UL;
}