diff options
Diffstat (limited to 'arch/microblaze/include/asm/atomic.h')
| -rw-r--r-- | arch/microblaze/include/asm/atomic.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/atomic.h b/arch/microblaze/include/asm/atomic.h new file mode 100644 index 000000000..42ac382a0 --- /dev/null +++ b/arch/microblaze/include/asm/atomic.h @@ -0,0 +1,27 @@ +#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 */ |