[linux-2.6-block.git] / arch / microblaze / include / asm / atomic.h

#ifndef _ASM_MICROBLAZE_ATOMIC_H
#define _ASM_MICROBLAZE_ATOMIC_H

#include <asm/cmpxchg.h>
#include <asm-generic/atomic.h>
#include <asm-generic/atomic64.h>

/*
 * Atomically test *v and decrement if it is greater than 0.
 * The function returns the old value of *v minus 1.
 */
static inline int atomic_dec_if_positive(atomic_t *v)
{
	unsigned long flags;
	int res;

	local_irq_save(flags);
	res = v->counter - 1;
	if (res >= 0)
		v->counter = res;
	local_irq_restore(flags);

	return res;
}
#define atomic_dec_if_positive atomic_dec_if_positive

#endif /* _ASM_MICROBLAZE_ATOMIC_H */
Commit	Line	Data
10713b1d MS	1	#ifndef _ASM_MICROBLAZE_ATOMIC_H
	2	#define _ASM_MICROBLAZE_ATOMIC_H
	3
c40d04df	4	#include <asm/cmpxchg.h>
0a584583	5	#include <asm-generic/atomic.h>
eacb6ec9	6	#include <asm-generic/atomic64.h>
10713b1d MS	7
	8	/*
	9	* Atomically test *v and decrement if it is greater than 0.
	10	* The function returns the old value of *v minus 1.
	11	*/
	12	static inline int atomic_dec_if_positive(atomic_t *v)
	13	{
	14	unsigned long flags;
	15	int res;
	16
	17	local_irq_save(flags);
	18	res = v->counter - 1;
	19	if (res >= 0)
	20	v->counter = res;
	21	local_irq_restore(flags);
	22
	23	return res;
	24	}
e79bee24	25	#define atomic_dec_if_positive atomic_dec_if_positive
10713b1d	26
10713b1d	27	#endif /* _ASM_MICROBLAZE_ATOMIC_H */