linux/include/linux/genetlink.h
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   1#ifndef __LINUX_GENERIC_NETLINK_H
   2#define __LINUX_GENERIC_NETLINK_H
   3
   4#include <uapi/linux/genetlink.h>
   5
   6
   7/* All generic netlink requests are serialized by a global lock.  */
   8extern void genl_lock(void);
   9extern void genl_unlock(void);
  10#ifdef CONFIG_LOCKDEP
  11extern int lockdep_genl_is_held(void);
  12#endif
  13
  14/**
  15 * rcu_dereference_genl - rcu_dereference with debug checking
  16 * @p: The pointer to read, prior to dereferencing
  17 *
  18 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  19 * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
  20 */
  21#define rcu_dereference_genl(p)                                 \
  22        rcu_dereference_check(p, lockdep_genl_is_held())
  23
  24/**
  25 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
  26 * @p: The pointer to read, prior to dereferencing
  27 *
  28 * Return the value of the specified RCU-protected pointer, but omit
  29 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  30 * caller holds genl mutex.
  31 */
  32#define genl_dereference(p)                                     \
  33        rcu_dereference_protected(p, lockdep_genl_is_held())
  34
  35#define MODULE_ALIAS_GENL_FAMILY(family)\
  36 MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
  37
  38#endif  /* __LINUX_GENERIC_NETLINK_H */
  39
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