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

/* SPDX-License-Identifier: GPL-2.0 */
#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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
10713b1d MS	2	#ifndef _ASM_MICROBLAZE_ATOMIC_H
	3	#define _ASM_MICROBLAZE_ATOMIC_H
	4
c40d04df	5	#include <asm/cmpxchg.h>
0a584583	6	#include <asm-generic/atomic.h>
eacb6ec9	7	#include <asm-generic/atomic64.h>
10713b1d MS	8
	9	/*
	10	* Atomically test *v and decrement if it is greater than 0.
	11	* The function returns the old value of *v minus 1.
	12	*/
	13	static inline int atomic_dec_if_positive(atomic_t *v)
	14	{
	15	unsigned long flags;
	16	int res;
	17
	18	local_irq_save(flags);
	19	res = v->counter - 1;
	20	if (res >= 0)
	21	v->counter = res;
	22	local_irq_restore(flags);
	23
	24	return res;
	25	}
e79bee24	26	#define atomic_dec_if_positive atomic_dec_if_positive
10713b1d	27
10713b1d	28	#endif /* _ASM_MICROBLAZE_ATOMIC_H */