[PATCH] atomic: add *_dec_not_zero

[Matt Turner]

On Tue, May 3, 2011 at 5:30 PM, Sven Eckelmann <sven at narfation.org> wrote:
> diff --git a/arch/alpha/include/asm/atomic.h b/arch/alpha/include/asm/atomic.h
> index e756d04..7e9434e 100644
> --- a/arch/alpha/include/asm/atomic.h
> +++ b/arch/alpha/include/asm/atomic.h
> @@ -200,6 +200,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
>  }
>
>  #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
> +#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
>
>  /**
>  * atomic64_add_unless - add unless the number is a given value
> @@ -226,6 +227,7 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
>  }
>
>  #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
> +#define atomic64_dec_not_zero(v) atomic64_add_unless((v), -1, 0)
>
>  #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
>  #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
> diff --git a/arch/alpha/include/asm/local.h b/arch/alpha/include/asm/local.h
> index b9e3e33..09fb327 100644
> --- a/arch/alpha/include/asm/local.h
> +++ b/arch/alpha/include/asm/local.h
> @@ -79,6 +79,7 @@ static __inline__ long local_sub_return(long i, local_t * l)
>        c != (u);                                               \
>  })
>  #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
> +#define local_dec_not_zero(l) local_add_unless((l), -1, 0)
>
>  #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
>

Acked-by: Matt Turner <mattst88 at gmail.com> [alpha]