diff options
Diffstat (limited to 'kernel/include/linux/genetlink.h')
| -rw-r--r-- | kernel/include/linux/genetlink.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/include/linux/genetlink.h b/kernel/include/linux/genetlink.h new file mode 100644 index 000000000..09460d6d6 --- /dev/null +++ b/kernel/include/linux/genetlink.h @@ -0,0 +1,42 @@ +#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 + +/* for synchronisation between af_netlink and genetlink */ +extern atomic_t genl_sk_destructing_cnt; +extern wait_queue_head_t genl_sk_destructing_waitq; + +/** + * 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 */ |