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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_MICROBLAZE_ATOMIC_H
3 #define _ASM_MICROBLAZE_ATOMIC_H
4 
5 #include <asm/cmpxchg.h>
6 #include <asm-generic/atomic.h>
7 #include <asm-generic/atomic64.h>
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  */
atomic_dec_if_positive(atomic_t * v)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 }
26 #define atomic_dec_if_positive atomic_dec_if_positive
27 
28 #endif /* _ASM_MICROBLAZE_ATOMIC_H */
29