Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _ASM_MICROBLAZE_ATOMIC_H
2#define _ASM_MICROBLAZE_ATOMIC_H
3
4#include <asm/cmpxchg.h>
5#include <asm-generic/atomic.h>
6#include <asm-generic/atomic64.h>
7
8/*
9 * Atomically test *v and decrement if it is greater than 0.
10 * The function returns the old value of *v minus 1.
11 */
12static inline int atomic_dec_if_positive(atomic_t *v)
13{
14 unsigned long flags;
15 int res;
16
17 local_irq_save(flags);
18 res = v->counter - 1;
19 if (res >= 0)
20 v->counter = res;
21 local_irq_restore(flags);
22
23 return res;
24}
25#define atomic_dec_if_positive atomic_dec_if_positive
26
27#endif /* _ASM_MICROBLAZE_ATOMIC_H */