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[PARISC] atomic64 support

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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: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin 2006-01-17 08:33:01 -07:00 committed by Kyle McMartin
parent 96629c0b11
commit 2e13b31e5b
1 changed files with 69 additions and 15 deletions
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84
include/asm-parisc/atomic.h
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@ -1,9 +1,13 @@
/* 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_ */