include/linux/spinlock.h - linux-mtk - Git at Google

 #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 <linux/typecheck.h>
 #include <linux/preempt.h>
 #include <linux/linkage.h>
 #include <linux/compiler.h>
 #include <linux/irqflags.h>
 #include <linux/thread_info.h>
 #include <linux/kernel.h>
 #include <linux/stringify.h>
 #include <linux/bottom_half.h>
 #include <asm/barrier.h>


 /*
  * 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 <linux/spinlock_types.h>

 /*
  * Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them):
  */
 #ifdef CONFIG_SMP
 # include <asm/spinlock.h>
 #else
 # include <linux/spinlock_up.h>
 #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 <linux/rwlock.h>

 /*
  * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
  */
 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 # include <linux/spinlock_api_smp.h>
 #else
 # include <linux/spinlock_api_up.h>
 #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 <linux/atomic.h>
 /**
  * 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 */
	#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 <linux/typecheck.h>
	#include <linux/preempt.h>
	#include <linux/linkage.h>
	#include <linux/compiler.h>
	#include <linux/irqflags.h>
	#include <linux/thread_info.h>
	#include <linux/kernel.h>
	#include <linux/stringify.h>
	#include <linux/bottom_half.h>
	#include <asm/barrier.h>


	/*
	* 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 <linux/spinlock_types.h>

	/*
	* Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them):
	*/
	#ifdef CONFIG_SMP
	# include <asm/spinlock.h>
	#else
	# include <linux/spinlock_up.h>
	#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 <linux/rwlock.h>

	/*
	* Pull the _spin_()/_read_()/_write_*() functions/declarations:
	*/
	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
	# include <linux/spinlock_api_smp.h>
	#else
	# include <linux/spinlock_api_up.h>
	#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 <linux/atomic.h>
	/**
	* 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 */