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#ifndef __LINUX_SPINLOCK_H

#define __LINUX_SPINLOCK_H

/*

 * include/linux/spinlock.h - generic spinlock/rwlock declarations

 *

 * here's the role of the various spinlock/rwlock related include files:

 *

 * on SMP builds:

 *

 *  asm/spinlock_types.h: contains the arch_spinlock_t/arch_rwlock_t and the

 *                        initializers

 *

 *  linux/spinlock_types.h:

 *                        defines the generic type and initializers

 *

 *  asm/spinlock.h:       contains the arch_spin_*()/etc. lowlevel

 *                        implementations, mostly inline assembly code

 *

 *   (also included on UP-debug builds:)

 *

 *  linux/spinlock_api_smp.h:

 *                        contains the prototypes for the _spin_*() APIs.

 *

 *  linux/spinlock.h:     builds the final spin_*() APIs.

 *

 * on UP builds:

 *

 *  linux/spinlock_type_up.h:

 *                        contains the generic, simplified UP spinlock type.

 *                        (which is an empty structure on non-debug builds)

 *

 *  linux/spinlock_types.h:

 *                        defines the generic type and initializers

 *

 *  linux/spinlock_up.h:

 *                        contains the arch_spin_*()/etc. version of UP

 *                        builds. (which are NOPs on non-debug, non-preempt

 *                        builds)

 *

 *   (included on UP-non-debug builds:)

 *

 *  linux/spinlock_api_up.h:

 *                        builds the _spin_*() APIs.

 *

 *  linux/spinlock.h:     builds the final spin_*() APIs.

 */

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

/*

 * Must define these before including other files, inline functions need them

 */

#define LOCK_SECTION_NAME ".text..lock."KBUILD_BASENAME

#define LOCK_SECTION_START(extra)               \

        ".subsection 1\n\t"                     \

        extra                                   \

        ".ifndef " LOCK_SECTION_NAME "\n\t"     \

        LOCK_SECTION_NAME ":\n\t"               \

        ".endif\n"

#define LOCK_SECTION_END                        \

        ".previous\n\t"

#define __lockfunc __attribute__((section(".spinlock.text")))

/*

 * Pull the arch_spinlock_t and arch_rwlock_t definitions:

 */

#include 

/*

 * Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them):

 */

#ifdef CONFIG_SMP

# include 

#else

# include 

#endif

#ifdef CONFIG_DEBUG_SPINLOCK

  extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,

			       struct lock_class_key *key);

# define raw_spin_lock_init(lock)				\

do {								\

	static struct lock_class_key __key;			\

								\

	__raw_spin_lock_init((lock), #lock, &__key);		\

} while (0)

#else

# define raw_spin_lock_init(lock)				\

	do { *(lock) = __RAW_SPIN_LOCK_UNLOCKED(lock); } while (0)

#endif

#define raw_spin_is_locked(lock)	arch_spin_is_locked(&(lock)->raw_lock)

#ifdef CONFIG_GENERIC_LOCKBREAK

#define raw_spin_is_contended(lock) ((lock)->break_lock)

#else

#ifdef arch_spin_is_contended

#define raw_spin_is_contended(lock)	arch_spin_is_contended(&(lock)->raw_lock)

#else

#define raw_spin_is_contended(lock)	(((void)(lock), 0))

#endif /*arch_spin_is_contended*/

#endif

/*

 * Despite its name it doesn't necessarily has to be a full barrier.

 * It should only guarantee that a STORE before the critical section

 * can not be reordered with a LOAD inside this section.

 * spin_lock() is the one-way barrier, this LOAD can not escape out

 * of the region. So the default implementation simply ensures that

 * a STORE can not move into the critical section, smp_wmb() should

 * serialize it with another STORE done by spin_lock().

 */

#ifndef smp_mb__before_spinlock

#define smp_mb__before_spinlock()	smp_wmb()

#endif

/*

 * Place this after a lock-acquisition primitive to guarantee that

 * an UNLOCK+LOCK pair act as a full barrier.  This guarantee applies

 * if the UNLOCK and LOCK are executed by the same CPU or if the

 * UNLOCK and LOCK operate on the same lock variable.

 */

#ifndef smp_mb__after_unlock_lock

#define smp_mb__after_unlock_lock()	do { } while (0)

#endif

/**

 * raw_spin_unlock_wait - wait until the spinlock gets unlocked

 * @lock: the spinlock in question.

 */

#define raw_spin_unlock_wait(lock)	arch_spin_unlock_wait(&(lock)->raw_lock)

#ifdef CONFIG_DEBUG_SPINLOCK

 extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);

#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock)

 extern int do_raw_spin_trylock(raw_spinlock_t *lock);

 extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);

#else

static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock)

{

	__acquire(lock);

	arch_spin_lock(&lock->raw_lock);

}

static inline void

do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock)

{

	__acquire(lock);

	arch_spin_lock_flags(&lock->raw_lock, *flags);

}

static inline int do_raw_spin_trylock(raw_spinlock_t *lock)

{

	return arch_spin_trylock(&(lock)->raw_lock);

}

static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)

{

	arch_spin_unlock(&lock->raw_lock);

	__release(lock);

}

#endif

/*

 * Define the various spin_lock methods.  Note we define these

 * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The

 * various methods are defined as nops in the case they are not

 * required.

 */

#define raw_spin_trylock(lock)	__cond_lock(lock, _raw_spin_trylock(lock))

#define raw_spin_lock(lock)	_raw_spin_lock(lock)

#ifdef CONFIG_DEBUG_LOCK_ALLOC

# define raw_spin_lock_nested(lock, subclass) \

	_raw_spin_lock_nested(lock, subclass)

# define raw_spin_lock_nest_lock(lock, nest_lock)			\

	 do {								\

		 typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\

		 _raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map);	\

	 } while (0)

#else

/*

 * Always evaluate the 'subclass' argument to avoid that the compiler

 * warns about set-but-not-used variables when building with

 * CONFIG_DEBUG_LOCK_ALLOC=n and with W=1.

 */

# define raw_spin_lock_nested(lock, subclass)		\

	_raw_spin_lock(((void)(subclass), (lock)))

# define raw_spin_lock_nest_lock(lock, nest_lock)	_raw_spin_lock(lock)

#endif

#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)

#define raw_spin_lock_irqsave(lock, flags)			\

	do {						\

		typecheck(unsigned long, flags);	\

		flags = _raw_spin_lock_irqsave(lock);	\

	} while (0)

#ifdef CONFIG_DEBUG_LOCK_ALLOC

#define raw_spin_lock_irqsave_nested(lock, flags, subclass)		\

	do {								\

		typecheck(unsigned long, flags);			\

		flags = _raw_spin_lock_irqsave_nested(lock, subclass);	\

	} while (0)

#else

#define raw_spin_lock_irqsave_nested(lock, flags, subclass)		\

	do {								\

		typecheck(unsigned long, flags);			\

		flags = _raw_spin_lock_irqsave(lock);			\

	} while (0)

#endif

#else

#define raw_spin_lock_irqsave(lock, flags)		\

	do {						\

		typecheck(unsigned long, flags);	\

		_raw_spin_lock_irqsave(lock, flags);	\

	} while (0)

#define raw_spin_lock_irqsave_nested(lock, flags, subclass)	\

	raw_spin_lock_irqsave(lock, flags)

#endif

#define raw_spin_lock_irq(lock)		_raw_spin_lock_irq(lock)

#define raw_spin_lock_bh(lock)		_raw_spin_lock_bh(lock)

#define raw_spin_unlock(lock)		_raw_spin_unlock(lock)

#define raw_spin_unlock_irq(lock)	_raw_spin_unlock_irq(lock)

#define raw_spin_unlock_irqrestore(lock, flags)		\

	do {						\

		typecheck(unsigned long, flags);	\

		_raw_spin_unlock_irqrestore(lock, flags);	\

	} while (0)

#define raw_spin_unlock_bh(lock)	_raw_spin_unlock_bh(lock)

#define raw_spin_trylock_bh(lock) \

	__cond_lock(lock, _raw_spin_trylock_bh(lock))

#define raw_spin_trylock_irq(lock) \

({ \

	local_irq_disable(); \

	raw_spin_trylock(lock) ? \

	1 : ({ local_irq_enable(); 0;  }); \

})

#define raw_spin_trylock_irqsave(lock, flags) \

({ \

	local_irq_save(flags); \

	raw_spin_trylock(lock) ? \

	1 : ({ local_irq_restore(flags); 0; }); \

})

/**

 * raw_spin_can_lock - would raw_spin_trylock() succeed?

 * @lock: the spinlock in question.

 */

#define raw_spin_can_lock(lock)	(!raw_spin_is_locked(lock))

/* Include rwlock functions */

#include 

/*

 * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:

 */

#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)

# include 

#else

# include 

#endif

/*

 * Map the spin_lock functions to the raw variants for PREEMPT_RT=n

 */

static inline raw_spinlock_t *spinlock_check(spinlock_t *lock)

{

	return &lock->rlock;

}

#define spin_lock_init(_lock)				\

do {							\

	spinlock_check(_lock);				\

	raw_spin_lock_init(&(_lock)->rlock);		\

} while (0)

static inline void spin_lock(spinlock_t *lock)

{

	raw_spin_lock(&lock->rlock);

}

static inline void spin_lock_bh(spinlock_t *lock)

{

	raw_spin_lock_bh(&lock->rlock);

}

static inline int spin_trylock(spinlock_t *lock)

{

	return raw_spin_trylock(&lock->rlock);

}

#define spin_lock_nested(lock, subclass)			\

do {								\

	raw_spin_lock_nested(spinlock_check(lock), subclass);	\

} while (0)

#define spin_lock_nest_lock(lock, nest_lock)				\

do {									\

	raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock);	\

} while (0)

static inline void spin_lock_irq(spinlock_t *lock)

{

	raw_spin_lock_irq(&lock->rlock);

}

#define spin_lock_irqsave(lock, flags)				\

do {								\

	raw_spin_lock_irqsave(spinlock_check(lock), flags);	\

} while (0)

#define spin_lock_irqsave_nested(lock, flags, subclass)			\

do {									\

	raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \

} while (0)

static inline void spin_unlock(spinlock_t *lock)

{

	raw_spin_unlock(&lock->rlock);

}

static inline void spin_unlock_bh(spinlock_t *lock)

{

	raw_spin_unlock_bh(&lock->rlock);

}

static inline void spin_unlock_irq(spinlock_t *lock)

{

	raw_spin_unlock_irq(&lock->rlock);

}

static inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)

{

	raw_spin_unlock_irqrestore(&lock->rlock, flags);

}

static inline int spin_trylock_bh(spinlock_t *lock)

{

	return raw_spin_trylock_bh(&lock->rlock);

}

static inline int spin_trylock_irq(spinlock_t *lock)

{

	return raw_spin_trylock_irq(&lock->rlock);

}

#define spin_trylock_irqsave(lock, flags)			\

({ \

	raw_spin_trylock_irqsave(spinlock_check(lock), flags); \

})

static inline void spin_unlock_wait(spinlock_t *lock)

{

	raw_spin_unlock_wait(&lock->rlock);

}

static inline int spin_is_locked(spinlock_t *lock)

{

	return raw_spin_is_locked(&lock->rlock);

}

static inline int spin_is_contended(spinlock_t *lock)

{

	return raw_spin_is_contended(&lock->rlock);

}

static inline int spin_can_lock(spinlock_t *lock)

{

	return raw_spin_can_lock(&lock->rlock);

}

#define assert_spin_locked(lock)	assert_raw_spin_locked(&(lock)->rlock)

/*

 * Pull the atomic_t declaration:

 * (asm-mips/atomic.h needs above definitions)

 */

#include 

/**

 * atomic_dec_and_lock - lock on reaching reference count zero

 * @atomic: the atomic counter

 * @lock: the spinlock in question

 *

 * Decrements @atomic by 1.  If the result is 0, returns true and locks

 * @lock.  Returns false for all other cases.

 */

extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);

#define atomic_dec_and_lock(atomic, lock) \

		__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))

#endif /* __LINUX_SPINLOCK_H */