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Commit 2e13b31e authored by Kyle McMartin's avatar Kyle McMartin Committed by Kyle McMartin
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[PARISC] atomic64 support 



Implement atomic64_t so atomic_long_t works on parisc. Also
clean up some of the coding style in atomic.h, and make sure
ATOMIC_INIT is cast properly.

Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent 96629c0b

include/asm-parisc/atomic.h

+69 −15
Original line number Diff line number Diff line 
/* 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/config.h>

#include <linux/types.h>

#include <asm/system.h>

/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>.  */



/*

 * Atomic operations that C can't guarantee us.  Useful for
@@ -46,15 +50,6 @@ extern raw_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned; 
#  define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)

#endif



/* Note that we need not lock read accesses - aligned word writes/reads

 * are atomic, so a reader never sees unconsistent values.

 *

 * Cache-line alignment would conflict with, for example, linux/module.h

 */



typedef struct { volatile int counter; } atomic_t;





/* This should get optimized out since it's never called.

** Or get a link error if xchg is used "wrong".

*/
@@ -69,10 +64,9 @@ 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)

static __inline__ unsigned long

__xchg(unsigned long x, __volatile__ void * ptr, int size)

{



	switch(size) {

#ifdef __LP64__

	case 8: return __xchg64(x,(unsigned long *) ptr);
@@ -129,7 +123,13 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) 
				    (unsigned long)_n_, sizeof(*(ptr))); \

  })



/* Note that we need not lock read accesses - aligned word writes/reads

 * are atomic, so a reader never sees unconsistent values.

 *

 * Cache-line alignment would conflict with, for example, linux/module.h

 */



typedef struct { volatile int counter; } atomic_t;



/* It's possible to reduce all atomic operations to either

 * __atomic_add_return, atomic_set and atomic_read (the latter
@@ -210,12 +210,66 @@ static __inline__ int atomic_read(const atomic_t *v) 


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



#define ATOMIC_INIT(i)	{ (i) }

#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 __LP64__



typedef struct { volatile s64 counter; } atomic64_t;



#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)



#endif /* __LP64__ */



#include <asm-generic/atomic.h>

#endif
 


#endif /* _ASM_PARISC_ATOMIC_H_ */