#ifndef __NET_NS_HASH_H__#define __NET_NS_HASH_H__#include <asm/cache.h>struct net;staticinlineunsignednet_hash_mix(struct net *net){#ifdef CONFIG_NET_NS/* * shift this right to eliminate bits, that are * always zeroed */return(unsigned)(((unsigned long)net) >> L1_CACHE_SHIFT);#elsereturn0;#endif}#endif