27 lines
533 B
C
27 lines
533 B
C
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#ifndef _ASM_MICROBLAZE_ATOMIC_H
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#define _ASM_MICROBLAZE_ATOMIC_H
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#include <asm/cmpxchg.h>
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#include <asm-generic/atomic.h>
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#include <asm-generic/atomic64.h>
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/*
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* Atomically test *v and decrement if it is greater than 0.
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* The function returns the old value of *v minus 1.
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*/
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static inline int atomic_dec_if_positive(atomic_t *v)
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{
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unsigned long flags;
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int res;
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local_irq_save(flags);
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res = v->counter - 1;
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if (res >= 0)
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v->counter = res;
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local_irq_restore(flags);
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return res;
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}
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#endif /* _ASM_MICROBLAZE_ATOMIC_H */
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