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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 */ |