#ifndef __NETNS_CORE_H__#define __NETNS_CORE_H__ struct ctl_table_header;struct prot_inuse; struct netns_core {	/* core sysctls */	struct ctl_table_header	*sysctl_hdr; 	int	sysctl_somaxconn; 	struct prot_inuse __percpu *inuse;}; #endif