HASH_KEY          100 net/ipv6/ip6_gre.c #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
HASH_KEY          198 tools/vm/page-types.c #define HASH_KEY(flags)	(flags & HASH_MASK)