forked from mirrors/linux
632a5c1c8f
Now that smp_read_barrier_depends() has been de-emphasized, the less said about it, the better. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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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* the READ_ONCE(), because 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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