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61d03535e4
This patch makes lockdep_genl_is_held return bool to improve readability due to this particular function only using either one or zero as its return value. No functional change. Signed-off-by: Yaowei Bai <bywxiaobai@163.com> Signed-off-by: David S. Miller <davem@davemloft.net>
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#ifndef __LINUX_GENERIC_NETLINK_H
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#define __LINUX_GENERIC_NETLINK_H
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#include <uapi/linux/genetlink.h>
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/* All generic netlink requests are serialized by a global lock. */
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extern void genl_lock(void);
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extern void genl_unlock(void);
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#ifdef CONFIG_LOCKDEP
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extern bool lockdep_genl_is_held(void);
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#endif
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/* for synchronisation between af_netlink and genetlink */
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extern atomic_t genl_sk_destructing_cnt;
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extern wait_queue_head_t genl_sk_destructing_waitq;
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/**
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* rcu_dereference_genl - rcu_dereference with debug checking
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* @p: The pointer to read, prior to dereferencing
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*
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* Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
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* or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
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*/
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#define rcu_dereference_genl(p) \
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rcu_dereference_check(p, lockdep_genl_is_held())
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/**
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* genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
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* @p: The pointer to read, prior to dereferencing
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*
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* Return the value of the specified RCU-protected pointer, but omit
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* both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
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* caller holds genl mutex.
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*/
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#define genl_dereference(p) \
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rcu_dereference_protected(p, lockdep_genl_is_held())
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#define MODULE_ALIAS_GENL_FAMILY(family)\
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MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
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#endif /* __LINUX_GENERIC_NETLINK_H */
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