include/linux/spinlock_types.h
author Florian Westphal <fw@strlen.de>
Sun, 11 Jan 2009 20:20:11 +0100
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#ifndef __LINUX_SPINLOCK_TYPES_H
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#define __LINUX_SPINLOCK_TYPES_H
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/*
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 * include/linux/spinlock_types.h - generic spinlock type definitions
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 *                                  and initializers
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 *
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 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
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 * Released under the General Public License (GPL).
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 */
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#if defined(CONFIG_SMP)
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# include <asm/spinlock_types.h>
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#else
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# include <linux/spinlock_types_up.h>
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#endif
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#include <linux/lockdep.h>
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typedef struct {
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	raw_spinlock_t raw_lock;
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#ifdef CONFIG_GENERIC_LOCKBREAK
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	unsigned int break_lock;
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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	unsigned int magic, owner_cpu;
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	void *owner;
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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	struct lockdep_map dep_map;
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#endif
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} spinlock_t;
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#define SPINLOCK_MAGIC		0xdead4ead
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typedef struct {
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	raw_rwlock_t raw_lock;
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#ifdef CONFIG_GENERIC_LOCKBREAK
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	unsigned int break_lock;
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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	unsigned int magic, owner_cpu;
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	void *owner;
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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	struct lockdep_map dep_map;
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#endif
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} rwlock_t;
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#define RWLOCK_MAGIC		0xdeaf1eed
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#define SPINLOCK_OWNER_INIT	((void *)-1L)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define SPIN_DEP_MAP_INIT(lockname)	.dep_map = { .name = #lockname }
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#else
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# define SPIN_DEP_MAP_INIT(lockname)
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define RW_DEP_MAP_INIT(lockname)	.dep_map = { .name = #lockname }
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#else
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# define RW_DEP_MAP_INIT(lockname)
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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# define __SPIN_LOCK_UNLOCKED(lockname)					\
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	(spinlock_t)	{	.raw_lock = __RAW_SPIN_LOCK_UNLOCKED,	\
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				.magic = SPINLOCK_MAGIC,		\
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				.owner = SPINLOCK_OWNER_INIT,		\
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				.owner_cpu = -1,			\
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				SPIN_DEP_MAP_INIT(lockname) }
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#define __RW_LOCK_UNLOCKED(lockname)					\
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	(rwlock_t)	{	.raw_lock = __RAW_RW_LOCK_UNLOCKED,	\
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				.magic = RWLOCK_MAGIC,			\
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				.owner = SPINLOCK_OWNER_INIT,		\
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				.owner_cpu = -1,			\
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				RW_DEP_MAP_INIT(lockname) }
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#else
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# define __SPIN_LOCK_UNLOCKED(lockname) \
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	(spinlock_t)	{	.raw_lock = __RAW_SPIN_LOCK_UNLOCKED,	\
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				SPIN_DEP_MAP_INIT(lockname) }
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#define __RW_LOCK_UNLOCKED(lockname) \
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	(rwlock_t)	{	.raw_lock = __RAW_RW_LOCK_UNLOCKED,	\
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				RW_DEP_MAP_INIT(lockname) }
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#endif
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/*
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 * SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and
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 * are hence deprecated.
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 * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
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 * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate.
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 */
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#define SPIN_LOCK_UNLOCKED	__SPIN_LOCK_UNLOCKED(old_style_spin_init)
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#define RW_LOCK_UNLOCKED	__RW_LOCK_UNLOCKED(old_style_rw_init)
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#define DEFINE_SPINLOCK(x)	spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
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#define DEFINE_RWLOCK(x)	rwlock_t x = __RW_LOCK_UNLOCKED(x)
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#endif /* __LINUX_SPINLOCK_TYPES_H */