#ifndef __LINUX_GENERIC_NETLINK_H
  #define __LINUX_GENERIC_NETLINK_H
  
  #include <uapi/linux/genetlink.h>
  
  
  /* All generic netlink requests are serialized by a global lock.  */
  extern void genl_lock(void);
  extern void genl_unlock(void);
  #ifdef CONFIG_LOCKDEP
  extern int lockdep_genl_is_held(void);
  #endif
  
  /**
   * rcu_dereference_genl - rcu_dereference with debug checking
   * @p: The pointer to read, prior to dereferencing
   *
   * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
   * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
   */
  #define rcu_dereference_genl(p)					\
  	rcu_dereference_check(p, lockdep_genl_is_held())
  
  /**
   * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
   * @p: The pointer to read, prior to dereferencing
   *
   * Return the value of the specified RCU-protected pointer, but omit
   * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
   * caller holds genl mutex.
   */
  #define genl_dereference(p)					\
  	rcu_dereference_protected(p, lockdep_genl_is_held())
  
  #define MODULE_ALIAS_GENL_FAMILY(family)\
   MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
  
  #endif	/* __LINUX_GENERIC_NETLINK_H */