[mirror_ubuntu-artful-kernel.git] / arch / microblaze / include / asm / atomic.h

#ifndef _ASM_MICROBLAZE_ATOMIC_H
#define _ASM_MICROBLAZE_ATOMIC_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;
}

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