[deliverable/linux.git] / arch / microblaze / include / asm / atomic.h

#ifndef _ASM_MICROBLAZE_ATOMIC_H
#define _ASM_MICROBLAZE_ATOMIC_H

#include <asm-generic/atomic.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;
}

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