[net-next-2.6.git] / arch / parisc / include / asm / atomic.h

/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
 * Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
 */

#ifndef _ASM_PARISC_ATOMIC_H_
#define _ASM_PARISC_ATOMIC_H_

#include <linux/types.h>
#include <asm/system.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 *
 * And probably incredibly slow on parisc.  OTOH, we don't
 * have to write any serious assembly.   prumpf
 */

#ifdef CONFIG_SMP
#include <asm/spinlock.h>
#include <asm/cache.h>		/* we use L1_CACHE_BYTES */

/* Use an array of spinlocks for our atomic_ts.
 * Hash function to index into a different SPINLOCK.
 * Since "a" is usually an address, use one spinlock per cacheline.
 */
#  define ATOMIC_HASH_SIZE 4
#  define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ]))

extern raw_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;

/* Can't use raw_spin_lock_irq because of #include problems, so
 * this is the substitute */
#define _atomic_spin_lock_irqsave(l,f) do {	\
	raw_spinlock_t *s = ATOMIC_HASH(l);		\
	local_irq_save(f);			\
	__raw_spin_lock(s);			\
} while(0)

#define _atomic_spin_unlock_irqrestore(l,f) do {	\
	raw_spinlock_t *s = ATOMIC_HASH(l);			\
	__raw_spin_unlock(s);				\
	local_irq_restore(f);				\
} while(0)


#else
#  define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
#  define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
#endif

/* This should get optimized out since it's never called.
** Or get a link error if xchg is used "wrong".
*/
extern void __xchg_called_with_bad_pointer(void);


/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
extern unsigned long __xchg8(char, char *);
extern unsigned long __xchg32(int, int *);
#ifdef CONFIG_64BIT
extern unsigned long __xchg64(unsigned long, unsigned long *);
#endif

/* optimizer better get rid of switch since size is a constant */
static __inline__ unsigned long
__xchg(unsigned long x, __volatile__ void * ptr, int size)
{
	switch(size) {
#ifdef CONFIG_64BIT
	case 8: return __xchg64(x,(unsigned long *) ptr);
#endif
	case 4: return __xchg32((int) x, (int *) ptr);
	case 1: return __xchg8((char) x, (char *) ptr);
	}
	__xchg_called_with_bad_pointer();
	return x;
}


/*
** REVISIT - Abandoned use of LDCW in xchg() for now:
** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
** o and while we are at it, could CONFIG_64BIT code use LDCD too?
**
**	if (__builtin_constant_p(x) && (x == NULL))
**		if (((unsigned long)p & 0xf) == 0)
**			return __ldcw(p);
*/
#define xchg(ptr,x) \
	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))


#define __HAVE_ARCH_CMPXCHG	1

/* bug catcher for when unsupported size is used - won't link */
extern void __cmpxchg_called_with_bad_pointer(void);

/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, unsigned int new_);
extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new_);

/* don't worry...optimizer will get rid of most of this */
static __inline__ unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
{
	switch(size) {
#ifdef CONFIG_64BIT
	case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
#endif
	case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int) old, (unsigned int) new_);
	}
	__cmpxchg_called_with_bad_pointer();
	return old;
}

#define cmpxchg(ptr,o,n)						 \
  ({									 \
     __typeof__(*(ptr)) _o_ = (o);					 \
     __typeof__(*(ptr)) _n_ = (n);					 \
     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
				    (unsigned long)_n_, sizeof(*(ptr))); \
  })

#include <asm-generic/cmpxchg-local.h>

static inline unsigned long __cmpxchg_local(volatile void *ptr,
				      unsigned long old,
				      unsigned long new_, int size)
{
	switch (size) {
#ifdef CONFIG_64BIT
	case 8:	return __cmpxchg_u64((unsigned long *)ptr, old, new_);
#endif
	case 4:	return __cmpxchg_u32(ptr, old, new_);
	default:
		return __cmpxchg_local_generic(ptr, old, new_, size);
	}
}

/*
 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 * them available.
 */
#define cmpxchg_local(ptr, o, n)				  	\
	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o),	\
			(unsigned long)(n), sizeof(*(ptr))))
#ifdef CONFIG_64BIT
#define cmpxchg64_local(ptr, o, n)					\
  ({									\
	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
	cmpxchg_local((ptr), (o), (n));					\
  })
#else
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
#endif

/*
 * Note that we need not lock read accesses - aligned word writes/reads
 * are atomic, so a reader never sees inconsistent values.
 */

/* It's possible to reduce all atomic operations to either
 * __atomic_add_return, atomic_set and atomic_read (the latter
 * is there only for consistency).
 */

static __inline__ int __atomic_add_return(int i, atomic_t *v)
{
	int ret;
	unsigned long flags;
	_atomic_spin_lock_irqsave(v, flags);

	ret = (v->counter += i);

	_atomic_spin_unlock_irqrestore(v, flags);
	return ret;
}

static __inline__ void atomic_set(atomic_t *v, int i) 
{
	unsigned long flags;
	_atomic_spin_lock_irqsave(v, flags);

	v->counter = i;

	_atomic_spin_unlock_irqrestore(v, flags);
}

static __inline__ int atomic_read(const atomic_t *v)
{
	return v->counter;
}

/* exported interface */
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

/**
 * atomic_add_unless - add unless the number is a given value
 * @v: pointer of type atomic_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns non-zero if @v was not @u, and zero otherwise.
 */
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
{
	int c, old;
	c = atomic_read(v);
	for (;;) {
		if (unlikely(c == (u)))
			break;
		old = atomic_cmpxchg((v), c, c + (a));
		if (likely(old == c))
			break;
		c = old;
	}
	return c != (u);
}

#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

#define atomic_add(i,v)	((void)(__atomic_add_return( ((int)(i)),(v))))
#define atomic_sub(i,v)	((void)(__atomic_add_return(-((int)(i)),(v))))
#define atomic_inc(v)	((void)(__atomic_add_return(   1,(v))))
#define atomic_dec(v)	((void)(__atomic_add_return(  -1,(v))))

#define atomic_add_return(i,v)	(__atomic_add_return( ((int)(i)),(v)))
#define atomic_sub_return(i,v)	(__atomic_add_return(-((int)(i)),(v)))
#define atomic_inc_return(v)	(__atomic_add_return(   1,(v)))
#define atomic_dec_return(v)	(__atomic_add_return(  -1,(v)))

#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)

/*
 * atomic_inc_and_test - increment and test
 * @v: pointer of type atomic_t
 *
 * Atomically increments @v by 1
 * and returns true if the result is zero, or false for all
 * other cases.
 */
#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)

#define atomic_dec_and_test(v)	(atomic_dec_return(v) == 0)

#define atomic_sub_and_test(i,v)	(atomic_sub_return((i),(v)) == 0)

#define ATOMIC_INIT(i)	((atomic_t) { (i) })

#define smp_mb__before_atomic_dec()	smp_mb()
#define smp_mb__after_atomic_dec()	smp_mb()
#define smp_mb__before_atomic_inc()	smp_mb()
#define smp_mb__after_atomic_inc()	smp_mb()

#ifdef CONFIG_64BIT

#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })

static __inline__ int
__atomic64_add_return(s64 i, atomic64_t *v)
{
	int ret;
	unsigned long flags;
	_atomic_spin_lock_irqsave(v, flags);

	ret = (v->counter += i);

	_atomic_spin_unlock_irqrestore(v, flags);
	return ret;
}

static __inline__ void
atomic64_set(atomic64_t *v, s64 i)
{
	unsigned long flags;
	_atomic_spin_lock_irqsave(v, flags);

	v->counter = i;

	_atomic_spin_unlock_irqrestore(v, flags);
}

static __inline__ s64
atomic64_read(const atomic64_t *v)
{
	return v->counter;
}

#define atomic64_add(i,v)	((void)(__atomic64_add_return( ((s64)(i)),(v))))
#define atomic64_sub(i,v)	((void)(__atomic64_add_return(-((s64)(i)),(v))))
#define atomic64_inc(v)		((void)(__atomic64_add_return(   1,(v))))
#define atomic64_dec(v)		((void)(__atomic64_add_return(  -1,(v))))

#define atomic64_add_return(i,v)	(__atomic64_add_return( ((s64)(i)),(v)))
#define atomic64_sub_return(i,v)	(__atomic64_add_return(-((s64)(i)),(v)))
#define atomic64_inc_return(v)		(__atomic64_add_return(   1,(v)))
#define atomic64_dec_return(v)		(__atomic64_add_return(  -1,(v)))

#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)

#define atomic64_inc_and_test(v) 	(atomic64_inc_return(v) == 0)
#define atomic64_dec_and_test(v)	(atomic64_dec_return(v) == 0)
#define atomic64_sub_and_test(i,v)	(atomic64_sub_return((i),(v)) == 0)

/* exported interface */
#define atomic64_cmpxchg(v, o, n) \
	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

/**
 * atomic64_add_unless - add unless the number is a given value
 * @v: pointer of type atomic64_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns non-zero if @v was not @u, and zero otherwise.
 */
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
	long c, old;
	c = atomic64_read(v);
	for (;;) {
		if (unlikely(c == (u)))
			break;
		old = atomic64_cmpxchg((v), c, c + (a));
		if (likely(old == c))
			break;
		c = old;
	}
	return c != (u);
}

#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

#endif /* CONFIG_64BIT */

#include <asm-generic/atomic.h>

#endif /* _ASM_PARISC_ATOMIC_H_ */
Commit	Line	Data
2e13b31e KM	1	/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
	2	* Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
	3	*/
	4
1da177e4 LT	5	#ifndef _ASM_PARISC_ATOMIC_H_
	6	#define _ASM_PARISC_ATOMIC_H_
	7
2e13b31e	8	#include <linux/types.h>
2856f5e3	9	#include <asm/system.h>
1da177e4 LT	10
	11	/*
	12	* Atomic operations that C can't guarantee us. Useful for
	13	* resource counting etc..
	14	*
	15	* And probably incredibly slow on parisc. OTOH, we don't
	16	* have to write any serious assembly. prumpf
	17	*/
	18
	19	#ifdef CONFIG_SMP
	20	#include <asm/spinlock.h>
	21	#include <asm/cache.h> /* we use L1_CACHE_BYTES */
	22
	23	/* Use an array of spinlocks for our atomic_ts.
	24	* Hash function to index into a different SPINLOCK.
	25	* Since "a" is usually an address, use one spinlock per cacheline.
	26	*/
	27	# define ATOMIC_HASH_SIZE 4
47e669ce	28	# define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ]))
1da177e4	29
fb1c8f93	30	extern raw_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;
1da177e4	31
fb1c8f93	32	/* Can't use raw_spin_lock_irq because of #include problems, so
1da177e4 LT	33	* this is the substitute */
1da177e4 LT	34	#define _atomic_spin_lock_irqsave(l,f) do { \
fb1c8f93	35	raw_spinlock_t *s = ATOMIC_HASH(l); \
1da177e4	36	local_irq_save(f); \
fb1c8f93	37	__raw_spin_lock(s); \
1da177e4 LT	38	} while(0)
	39
	40	#define _atomic_spin_unlock_irqrestore(l,f) do { \
fb1c8f93 IM	41	raw_spinlock_t *s = ATOMIC_HASH(l); \
fb1c8f93 IM	42	__raw_spin_unlock(s); \
1da177e4 LT	43	local_irq_restore(f); \
	44	} while(0)
	45
	46
	47	#else
	48	# define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
	49	# define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
	50	#endif
	51
1da177e4 LT	52	/* This should get optimized out since it's never called.
	53	** Or get a link error if xchg is used "wrong".
	54	*/
	55	extern void __xchg_called_with_bad_pointer(void);
	56
	57
	58	/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
	59	extern unsigned long __xchg8(char, char *);
	60	extern unsigned long __xchg32(int, int *);
513e7ecd	61	#ifdef CONFIG_64BIT
1da177e4 LT	62	extern unsigned long __xchg64(unsigned long, unsigned long *);
	63	#endif
	64
	65	/* optimizer better get rid of switch since size is a constant */
2e13b31e KM	66	static __inline__ unsigned long
2e13b31e KM	67	__xchg(unsigned long x, __volatile__ void * ptr, int size)
1da177e4	68	{
1da177e4	69	switch(size) {
513e7ecd	70	#ifdef CONFIG_64BIT
1da177e4 LT	71	case 8: return __xchg64(x,(unsigned long *) ptr);
	72	#endif
	73	case 4: return __xchg32((int) x, (int *) ptr);
	74	case 1: return __xchg8((char) x, (char *) ptr);
	75	}
	76	__xchg_called_with_bad_pointer();
	77	return x;
	78	}
	79
	80
	81	/*
	82	** REVISIT - Abandoned use of LDCW in xchg() for now:
	83	** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
513e7ecd	84	** o and while we are at it, could CONFIG_64BIT code use LDCD too?
1da177e4 LT	85	**
	86	** if (__builtin_constant_p(x) && (x == NULL))
	87	** if (((unsigned long)p & 0xf) == 0)
	88	** return __ldcw(p);
	89	*/
	90	#define xchg(ptr,x) \
	91	((__typeof__((ptr)))__xchg((unsigned long)(x),(ptr),sizeof((ptr))))
	92
	93
	94	#define __HAVE_ARCH_CMPXCHG 1
	95
	96	/* bug catcher for when unsupported size is used - won't link */
	97	extern void __cmpxchg_called_with_bad_pointer(void);
	98
	99	/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
	100	extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, unsigned int new_);
	101	extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new_);
	102
	103	/* don't worry...optimizer will get rid of most of this */
	104	static __inline__ unsigned long
	105	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
	106	{
	107	switch(size) {
513e7ecd	108	#ifdef CONFIG_64BIT
1da177e4 LT	109	case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
	110	#endif
	111	case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int) old, (unsigned int) new_);
	112	}
	113	__cmpxchg_called_with_bad_pointer();
	114	return old;
	115	}
	116
	117	#define cmpxchg(ptr,o,n) \
	118	({ \
	119	__typeof__(*(ptr)) _o_ = (o); \
	120	__typeof__(*(ptr)) _n_ = (n); \
	121	(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
	122	(unsigned long)_n_, sizeof(*(ptr))); \
	123	})
	124
df80c8c5 MD	125	#include <asm-generic/cmpxchg-local.h>
	126
	127	static inline unsigned long __cmpxchg_local(volatile void *ptr,
	128	unsigned long old,
	129	unsigned long new_, int size)
	130	{
	131	switch (size) {
	132	#ifdef CONFIG_64BIT
	133	case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
	134	#endif
	135	case 4: return __cmpxchg_u32(ptr, old, new_);
	136	default:
	137	return __cmpxchg_local_generic(ptr, old, new_, size);
	138	}
	139	}
	140
	141	/*
	142	* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
	143	* them available.
	144	*/
	145	#define cmpxchg_local(ptr, o, n) \
	146	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
	147	(unsigned long)(n), sizeof(*(ptr))))
	148	#ifdef CONFIG_64BIT
	149	#define cmpxchg64_local(ptr, o, n) \
	150	({ \
	151	BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
	152	cmpxchg_local((ptr), (o), (n)); \
	153	})
	154	#else
	155	#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
	156	#endif
	157
ea435467 MW	158	/*
	159	* Note that we need not lock read accesses - aligned word writes/reads
	160	* are atomic, so a reader never sees inconsistent values.
2e13b31e	161	*/
1da177e4	162
1da177e4 LT	163	/* It's possible to reduce all atomic operations to either
	164	* __atomic_add_return, atomic_set and atomic_read (the latter
	165	* is there only for consistency).
	166	*/
	167
	168	static __inline__ int __atomic_add_return(int i, atomic_t *v)
	169	{
	170	int ret;
	171	unsigned long flags;
	172	_atomic_spin_lock_irqsave(v, flags);
	173
	174	ret = (v->counter += i);
	175
	176	_atomic_spin_unlock_irqrestore(v, flags);
	177	return ret;
	178	}
	179
	180	static __inline__ void atomic_set(atomic_t *v, int i)
	181	{
	182	unsigned long flags;
	183	_atomic_spin_lock_irqsave(v, flags);
	184
	185	v->counter = i;
	186
	187	_atomic_spin_unlock_irqrestore(v, flags);
	188	}
	189
	190	static __inline__ int atomic_read(const atomic_t *v)
	191	{
	192	return v->counter;
	193	}
	194
	195	/* exported interface */
8ffe9d0b	196	#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
ffbf670f	197	#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
1da177e4	198
8426e1f6 NP	199	/**
	200	* atomic_add_unless - add unless the number is a given value
	201	* @v: pointer of type atomic_t
	202	* @a: the amount to add to v...
	203	* @u: ...unless v is equal to u.
	204	*
	205	* Atomically adds @a to @v, so long as it was not @u.
	206	* Returns non-zero if @v was not @u, and zero otherwise.
	207	*/
2856f5e3 MD	208	static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
	209	{
	210	int c, old;
	211	c = atomic_read(v);
	212	for (;;) {
	213	if (unlikely(c == (u)))
	214	break;
	215	old = atomic_cmpxchg((v), c, c + (a));
	216	if (likely(old == c))
	217	break;
	218	c = old;
	219	}
	220	return c != (u);
	221	}
	222
8426e1f6 NP	223	#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
8426e1f6 NP	224
47e669ce JB	225	#define atomic_add(i,v) ((void)(__atomic_add_return( ((int)(i)),(v))))
47e669ce JB	226	#define atomic_sub(i,v) ((void)(__atomic_add_return(-((int)(i)),(v))))
1da177e4 LT	227	#define atomic_inc(v) ((void)(__atomic_add_return( 1,(v))))
	228	#define atomic_dec(v) ((void)(__atomic_add_return( -1,(v))))
	229
47e669ce JB	230	#define atomic_add_return(i,v) (__atomic_add_return( ((int)(i)),(v)))
47e669ce JB	231	#define atomic_sub_return(i,v) (__atomic_add_return(-((int)(i)),(v)))
1da177e4 LT	232	#define atomic_inc_return(v) (__atomic_add_return( 1,(v)))
	233	#define atomic_dec_return(v) (__atomic_add_return( -1,(v)))
	234
	235	#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
	236
	237	/*
	238	* atomic_inc_and_test - increment and test
	239	* @v: pointer of type atomic_t
	240	*
	241	* Atomically increments @v by 1
	242	* and returns true if the result is zero, or false for all
	243	* other cases.
	244	*/
	245	#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
	246
	247	#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
	248
4da9f131 KM	249	#define atomic_sub_and_test(i,v) (atomic_sub_return((i),(v)) == 0)
4da9f131 KM	250
2e13b31e	251	#define ATOMIC_INIT(i) ((atomic_t) { (i) })
1da177e4 LT	252
	253	#define smp_mb__before_atomic_dec() smp_mb()
	254	#define smp_mb__after_atomic_dec() smp_mb()
	255	#define smp_mb__before_atomic_inc() smp_mb()
	256	#define smp_mb__after_atomic_inc() smp_mb()
	257
513e7ecd	258	#ifdef CONFIG_64BIT
2e13b31e	259
2e13b31e KM	260	#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
	261
	262	static __inline__ int
	263	__atomic64_add_return(s64 i, atomic64_t *v)
	264	{
	265	int ret;
	266	unsigned long flags;
	267	_atomic_spin_lock_irqsave(v, flags);
	268
	269	ret = (v->counter += i);
	270
	271	_atomic_spin_unlock_irqrestore(v, flags);
	272	return ret;
	273	}
	274
	275	static __inline__ void
	276	atomic64_set(atomic64_t *v, s64 i)
	277	{
	278	unsigned long flags;
	279	_atomic_spin_lock_irqsave(v, flags);
	280
	281	v->counter = i;
	282
	283	_atomic_spin_unlock_irqrestore(v, flags);
	284	}
	285
	286	static __inline__ s64
	287	atomic64_read(const atomic64_t *v)
	288	{
	289	return v->counter;
	290	}
	291
47e669ce JB	292	#define atomic64_add(i,v) ((void)(__atomic64_add_return( ((s64)(i)),(v))))
47e669ce JB	293	#define atomic64_sub(i,v) ((void)(__atomic64_add_return(-((s64)(i)),(v))))
2e13b31e KM	294	#define atomic64_inc(v) ((void)(__atomic64_add_return( 1,(v))))
	295	#define atomic64_dec(v) ((void)(__atomic64_add_return( -1,(v))))
	296
47e669ce JB	297	#define atomic64_add_return(i,v) (__atomic64_add_return( ((s64)(i)),(v)))
47e669ce JB	298	#define atomic64_sub_return(i,v) (__atomic64_add_return(-((s64)(i)),(v)))
2e13b31e KM	299	#define atomic64_inc_return(v) (__atomic64_add_return( 1,(v)))
	300	#define atomic64_dec_return(v) (__atomic64_add_return( -1,(v)))
	301
	302	#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
	303
	304	#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
	305	#define atomic64_dec_and_test(v) (atomic64_dec_return(v) == 0)
4da9f131	306	#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i),(v)) == 0)
2e13b31e	307
8ffe9d0b MD	308	/* exported interface */
	309	#define atomic64_cmpxchg(v, o, n) \
	310	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
	311	#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
	312
	313	/**
	314	* atomic64_add_unless - add unless the number is a given value
	315	* @v: pointer of type atomic64_t
	316	* @a: the amount to add to v...
	317	* @u: ...unless v is equal to u.
	318	*
	319	* Atomically adds @a to @v, so long as it was not @u.
	320	* Returns non-zero if @v was not @u, and zero otherwise.
	321	*/
2856f5e3 MD	322	static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
	323	{
	324	long c, old;
	325	c = atomic64_read(v);
	326	for (;;) {
	327	if (unlikely(c == (u)))
	328	break;
	329	old = atomic64_cmpxchg((v), c, c + (a));
	330	if (likely(old == c))
	331	break;
	332	c = old;
	333	}
	334	return c != (u);
	335	}
	336
8ffe9d0b MD	337	#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
8ffe9d0b MD	338
513e7ecd	339	#endif /* CONFIG_64BIT */
2e13b31e	340
d3cb4871	341	#include <asm-generic/atomic.h>
2e13b31e KM	342
2e13b31e KM	343	#endif /* _ASM_PARISC_ATOMIC_H_ */