linux-kernel - Re: [PATCHv2] atomic: add *_dec_not

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Date:	Mon, 23 May 2011 09:27:40 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Sven Eckelmann <sven@...fation.org>
Cc:	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org,
	Hirokazu Takata <takata@...ux-m32r.org>,
	linux-m32r@...linux-m32r.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>, linux-sh@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org
Subject: Re: [PATCHv2] atomic: add *_dec_not_zero

On Wed, May 18, 2011 at 09:49:54PM +0200, Sven Eckelmann wrote:
> Introduce an *_dec_not_zero operation.  Make this a special case of
> *_add_unless because batman-adv uses atomic_dec_not_zero in different
> places like re-broadcast queue or aggregation queue management. There
> are other non-final patches which may also want to use this macro.
[...]
> ---
> This is actually the same patch as before, but I am still waiting for
> some (N)Acks for ia64, m32r, s390, sh and generic.
[...]
> diff --git a/arch/s390/include/asm/atomic.h b/arch/s390/include/asm/atomic.h
> index d9db138..09972c3 100644
> --- a/arch/s390/include/asm/atomic.h
> +++ b/arch/s390/include/asm/atomic.h
> @@ -109,6 +109,7 @@ 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)
> 
>  #undef __CS_LOOP
> 
> @@ -326,6 +327,7 @@ static inline long long atomic64_dec_if_positive(atomic64_t *v)
>  #define atomic64_dec_return(_v)		atomic64_sub_return(1, _v)
>  #define atomic64_dec_and_test(_v)	(atomic64_sub_return(1, _v) == 0)
>  #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 smp_mb__before_atomic_dec()	smp_mb()
>  #define smp_mb__after_atomic_dec()	smp_mb()

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>
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